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Articles 1891 - 1920 of 2628
Full-Text Articles in Physical Sciences and Mathematics
Investigation Of The Cation Complexation By Macrocyclic Ethers Using ^{13}C Nmr Spin--Lattice Dipolar Relaxation Time Measurements, Çakil Erk, Matthias Heydenreich, Erich Kleinpeter
Investigation Of The Cation Complexation By Macrocyclic Ethers Using ^{13}C Nmr Spin--Lattice Dipolar Relaxation Time Measurements, Çakil Erk, Matthias Heydenreich, Erich Kleinpeter
Turkish Journal of Chemistry
The binding constants (K_a) of [18]crown-6 ether with Na^+ , K^+, and Ba^{2+} thiocyanates were determined by ^{13}C{^1H} NMR spin--lattice dipolar relaxation time measurements. The observed relaxation times (T_{obs}) for ^{13}C nuclei are dependent upon the relaxation times of the complexed (T_{1a}) and free crown ether (T_{1f}), and were measured in [D4]methanol using inversion--recovery measurements in the extreme narrowing limit (75 MHz). The observed ^{13}C relaxation times of the metal complexes were found to be smaller than those of the cation-free macrocyclic ether due to reduced internal flexibility of the macrocycles in the complexes. The relationship 1/T_{obs} = P_a/T_{1a} + …
Cumene Cracking On Modified Mesoporous Material Type Mcm-41, Ahmed Belhakem, Abdelkader Bengueddach
Cumene Cracking On Modified Mesoporous Material Type Mcm-41, Ahmed Belhakem, Abdelkader Bengueddach
Turkish Journal of Chemistry
The effect of ionic exchange degree of H(X)-AlMCM-41 materials, the method of its exchange and its grain form were investigated for mesoporous catalytic activity in the cumene cracking reaction. Benzene, propylene and xylene derivatives are the main products of this reaction. Olefins like butene and pentene appeared as the products of secondary reactions. No saturated hydrocarbons, which are typical products of secondary reactions obtained with HNaY zeolites, were formed, except for traces of butane. Generally the exchanged H(X)-AlMCM-41 materials by the substitution of Na^+ by NH_4^+ are more active than those exchanged directly with acid solution (substitution of Na^+ by …
Online Viscosity Measurement Of Complex Solutions Using Ultrasound Doppler Velocimetry, Volkan Köseli̇, Şeri̇fe Zeybek, Yusuf Uludağ
Online Viscosity Measurement Of Complex Solutions Using Ultrasound Doppler Velocimetry, Volkan Köseli̇, Şeri̇fe Zeybek, Yusuf Uludağ
Turkish Journal of Chemistry
A new method to measure the viscosity of non-Newtonian fluids over a wide range of shear rates in a short period of time is presented. The technique is based on the measurement of the velocity profile in a pipe flow using ultrasound Doppler velocimetry (UDV), which is a non-invasive method, and simultaneously determining the pressure drop. The velocity profile is used to obtain shear rate distribution, while the pressure drop is used to calculate the shear stress distribution. By taking the ratio of these quantities at a radial position, local viscosity can be obtained within the shear rate range in …
Secondary Metabolites From Euphorbia Helioscopia And Their Vasodepressor Activity, Asli Barla, Hüsni̇ye Bi̇rman, Şükran Kültür, Sevi̇l Öksüz
Secondary Metabolites From Euphorbia Helioscopia And Their Vasodepressor Activity, Asli Barla, Hüsni̇ye Bi̇rman, Şükran Kültür, Sevi̇l Öksüz
Turkish Journal of Chemistry
From the aerial parts of Euphorbia helioscopia L. (Euphorbiaceae), a jatrophane diterpene ester, 5,11-jatrophadiene-3-benzoyloxy-7,9,14-tri-acetyloxy-15-ol and 2 lupane derivatives, lup-20(29)-ene-3-acetate and lup-20(29)-ene-3-palmitate, together with common triterpenoids of Euphorbiaceae, 24-methylene cycloartanol, 24-methylenecycloart-3-one, cycloartanol, and stigmast-4-ene-3-one were isolated. The last compounds, lup-20(29)-ene-3-acetate, 24-methylene cycloartanol, 24-methylenecycloart-3-one, cycloartanol, and stigmast-4-ene-3-one, were isolated for the first time from E. helioscopia}. The fractions and the isolates were tested for their vasodepressor effects using Wistar Albino rats, and 5,11-jatrophadiene-3-benzoyloxy-7,9,14-tri-acetyloxy- 15-ol, lup-20(29)-ene-3-acetate, and stigmast-4-ene-3-one were found to possess relevant activity. The structures of all of the compounds were identified with high field spectroscopic methods. The detailed spectroscopic data of …
A Novel Approach To The Hydrothermal Synthesis Of Anatase Titania Nanoparticles And The Photocatalytic Degradation Of Rhodamine B, Murat Akarsu, Meltem Asi̇ltürk, Funda Sayilkan, Nadi̇r Ki̇raz, Ertuğrul Arpaç, Hi̇kmet Sayilkan
A Novel Approach To The Hydrothermal Synthesis Of Anatase Titania Nanoparticles And The Photocatalytic Degradation Of Rhodamine B, Murat Akarsu, Meltem Asi̇ltürk, Funda Sayilkan, Nadi̇r Ki̇raz, Ertuğrul Arpaç, Hi̇kmet Sayilkan
Turkish Journal of Chemistry
A novel approach was developed for the synthesis of high-dispersed anatase nano-TiO_2 by a hydrothermal process without solvent at 200 °C in 1 h. It was characterized using XRD, TEM, BET and elemental analysis. Nanoparticle-TiO_2 was used as a photocatalyst by considering complete degradation of Rhodamine B (RB) dye. The photocatalytic reaction parameters such as photocatalyst amount, irradiation time and dye concentration were optimized and it was found that 0.125 wt% catalyst in 30 mg/L of RB aqueous solution is adequate for full degradation of RB in 50 min with 770 W/m^2 irradiation power. Photocatalytic activity of the nanoparticle-TiO_2 was …
Synthesis And Spectroscopic Characterization Of Biologically Active Triarylantimony(V) Carboxylates Containing Germanium, Muhammad Kaleem Khosa, Muhammad Mazhar, Saqib Ali, Khadija Shahid, Farnaz Malik
Synthesis And Spectroscopic Characterization Of Biologically Active Triarylantimony(V) Carboxylates Containing Germanium, Muhammad Kaleem Khosa, Muhammad Mazhar, Saqib Ali, Khadija Shahid, Farnaz Malik
Turkish Journal of Chemistry
A new series of bimetallic (Ge and Sb) compounds (1-7) was synthesized and characterized by elemental analyses, FT-IR, multinuclear NMR (^1H, ^{13}C) spectroscopy and mass spectrometry. These techniques not only confirmed the formation of the compounds, but also revealed their trigonal bipyramidal geometry around antimony(V). Selected compounds were screened against different pathogens and showed promising antibacterial and antifungal activities.
Synthesis And Antimicrobial Activity Of Some New 3-Substituted Benzyl-5-(4-Chloro-2-Piperidin-1yl-Thiazole-5-Yl-Methylene)-Thiazolidine-2,4-Dione Derivatives, Meltem Ceylan Ünlüsoy, Oya Bozdağ Dündar, Nurten Altanlar, Rahmi̇ye Ertan
Synthesis And Antimicrobial Activity Of Some New 3-Substituted Benzyl-5-(4-Chloro-2-Piperidin-1yl-Thiazole-5-Yl-Methylene)-Thiazolidine-2,4-Dione Derivatives, Meltem Ceylan Ünlüsoy, Oya Bozdağ Dündar, Nurten Altanlar, Rahmi̇ye Ertan
Turkish Journal of Chemistry
A new series of thiazolyl thiazolidine-2,4-dione (Va-f) were synthesized and their structures were elucidated by IR, ^1H-NMR, mass spectra and elementary analysis. The synthesized compounds were tested for their antimicrobial activities against Candida albicans, Staphylococcus aureus, Bacillus subtilis and Escherichia coli. Compounds Va-b, Vd-f showed high activity against Escherichia coli comparable to ampicillin.
Metal Complexes Of Schiff Bases: Preparation, Characterization, And Biological Activity, Gehad Genidy Mohamed, Mohamed Mohamed Omar, Ahmed Mohamed Hindy
Metal Complexes Of Schiff Bases: Preparation, Characterization, And Biological Activity, Gehad Genidy Mohamed, Mohamed Mohamed Omar, Ahmed Mohamed Hindy
Turkish Journal of Chemistry
Metal complexes of Schiff bases derived from 2-furancarboxaldehyde and o-phenylenediamine (L^1), and 2-thiophenecarboxaldehyde and 2-aminothiophenol (HL^2) are reported and characterized based on elemental analyses, IR ^1H NMR, solid reflectance, magnetic moment, molar conductance, and thermal analysis (TGA). The ligand dissociation, as well as the metal-ligand stability constants were calculated, pH-metrically, at 25 °C and ionic strength \mu = 0.1 (1 M NaCl). The complexes are found to have the formulae [M(L^1)(H_2O)_2](Cl)_n \cdot yH_2O (where M = Fe(III), Ni(II), Cu(II); n = 2-3, y = 2-4); [M(L^1)](X)_2 \cdot yH_2O (where M = Co(II), Zn(II), UO_2(II), X = Cl, AcO or NO_3, …
Secondary Metabolites From Phlomis Syriaca And Their Antioxidant Activities, Ü. Şebnem Harput, İhsan Çaliş, İclal Saracoğlu, Ali̇ Arslan Dönmez, Akito Nagatsu
Secondary Metabolites From Phlomis Syriaca And Their Antioxidant Activities, Ü. Şebnem Harput, İhsan Çaliş, İclal Saracoğlu, Ali̇ Arslan Dönmez, Akito Nagatsu
Turkish Journal of Chemistry
An iridoid glucoside, lamiide (1); 4 phenylethanoid glycosides, acteoside (2), \beta-OH acteoside (3), leucosceptoside A (4) and samioside (5); a caffeic acid ester, chlorogenic acid (6); 2 flavone glucosides, luteolin-7-O-glucopyranoside (7) and chrysoeriol-7-O-glucopyranoside (8); and a flavanone aglycone, naringenin (9), were isolated from the aerial parts of Phlomis syriaca. The structures of the isolated compounds were elucidated by means of spectroscopic (UV, IR, 1D- and 2D-NMR, and FAB-MS) methods. Free radical scavenging activity of the isolated compounds was determined using the radical 2,2-diphenyl-1-picrylhydrazyl (DPPH), spectroscopically.
Iridoid, Flavonoid, And Phenylethanoid Glycosides From Wiedemannia Orientalis, Zühal Güvenalp, Hi̇lal Özbek, Türesi̇n Ünsalar, Cavi̇t Kazaz, L. Ömür Demi̇rezer
Iridoid, Flavonoid, And Phenylethanoid Glycosides From Wiedemannia Orientalis, Zühal Güvenalp, Hi̇lal Özbek, Türesi̇n Ünsalar, Cavi̇t Kazaz, L. Ömür Demi̇rezer
Turkish Journal of Chemistry
Five iridoid glycosides, lamiide, ipolamiide, ipolamiidoside, 6\beta-hydroxyipolamiide, and 5-hydroxy-8-epi-loganin; 5 flavonoid glycosides, apigenin 7-O-\beta-glucopyranoside, luteolin 5-O-\beta- glucopyranoside, isorhamnetin 3-O-rutinoside, quercetin 3-O-rutinoside, and apigenin 7-O-(6''-O-trans-p-coumaroyl) \beta-glucopyranoside; and a phenylethanoid glycoside, acteoside (= verbascoside), were isolated from the aerial parts of Wiedemannia orientalis (Lamiaceae). Their structures were identified using spectral methods (UV, 1D- and 2D-NMR, and EI-MS).
Electrochemical Synthesis Of N-Methylpyrrole And N-Methylcarbazole Copolymer On Carbon Fiber Microelectrodes, And Their Characterization, A. Sezai̇ Saraç, Erkan Doğru, Murat Ateş, Eli̇f Altürk Parlak
Electrochemical Synthesis Of N-Methylpyrrole And N-Methylcarbazole Copolymer On Carbon Fiber Microelectrodes, And Their Characterization, A. Sezai̇ Saraç, Erkan Doğru, Murat Ateş, Eli̇f Altürk Parlak
Turkish Journal of Chemistry
Copolymer films of N-methylpyrrole (N-MPy) and N-methylcarbazole (N-MCz) were synthesized electrochemically onto single carbon fiber microelectrodes (CFMEs). Deposition conditions on the carbon fiber, influence of the monomer concentrations on the copolymerization of P[N-methylpyrrole-co-N-methylcarbazole] P[N-MPy-co-N-MCz], and the electrochemistry of the resulting homopolymer and copolymers were studied using cyclic voltammetry, FTIR-ATR, in-situ spectroelectrochemistry, a UV-vis spectrophotometer, and a 4-point probe conductometer. The effects of current density, supporting electrolyte type, temperature, and monomer concentrations on the formation of the film were studied. Redox parameters and stability of charged films were obtained by cyclic voltammetry. The most stable copolymer was obtained in lithium perchlorate-acetonitrile …
Synthesis, Characterization, Crystal Structure And Thermal Behavior Of N'-(4-Chlorobenzoyl)-N,N-Di-N-Butylthiourea And Its Nickel Complex, Hakan Arslan, Ulrich Flörke, Nevzat Külcü, Esra Kayhan
Synthesis, Characterization, Crystal Structure And Thermal Behavior Of N'-(4-Chlorobenzoyl)-N,N-Di-N-Butylthiourea And Its Nickel Complex, Hakan Arslan, Ulrich Flörke, Nevzat Külcü, Esra Kayhan
Turkish Journal of Chemistry
We report the synthesis, structural characterization and thermal behavior of N'-(4-chlorobenzoyl)-N,N-di-n-butylthiourea (HL) and its nickel complex (NiL_2). Some physical properties of the prepared compounds were investigated using elemental analyses, IR, ^1H-NMR, and magnetic susceptibility. The molecular structures of HL and NiL_2 were determined by single crystal X-ray diffraction. HL is a monoclinic, space group P2_1/c with a = 10.7457(5) Å, b = 15.5909(8) Å, c = 10.4536(5) Å, \beta = 104.398(1)°, and V = 1696.34(14) Å^3 with Z = 4 for d_{calc} = 1.280 g/cm^3. NiL_2 is a triclinic, space group P-1 with a = 8.561(3) Å, b = 16.643(6) …
Chemistry Of Bicyclic Endoperoxides Derived From Dihydropyridine Derivatives: Attempted Synthesis Of Polyhydroxypiperidine Derivatives, Emi̇ne Salamci, Beyhan Bayram, Meti̇n Balci
Chemistry Of Bicyclic Endoperoxides Derived From Dihydropyridine Derivatives: Attempted Synthesis Of Polyhydroxypiperidine Derivatives, Emi̇ne Salamci, Beyhan Bayram, Meti̇n Balci
Turkish Journal of Chemistry
To achieve the synthesis of azasugar derivatives with the utilization of singlet oxygen, pyridine was used as the starting material. The reduction of pyridine followed by a singlet oxygen reaction afforded cyclic aza-endoperoxides (14 and 16). However, many attempts were made to convert the aza-endoperoxides to the corresponding di- and triacetates without success. However, the base-catalyzed rearrangement of 14 gave unprecedented rearrangement products 23 and 24.
Optical Fluoride Sensing With A Bay Region Functionalized Perylenediimide Dye, Funda Yukruk
Optical Fluoride Sensing With A Bay Region Functionalized Perylenediimide Dye, Funda Yukruk
Turkish Journal of Chemistry
A perylenedimiide (PDI) derivative functionalized at the perylene core (bay region) to carry phenyl boronic acid groups was shown to interact with fluoride with changes in the emission and absorption spectrum. These changes are most likely due to fluoride-induced aggregation and/or quenching of the perylenediimide dye. The dye is also selective; among halide ions, fluoride anions generate a significant response. Thus, this class of PDI derivatives is likely to be useful in practical fluoride sensing.
Spectroscopic Characterisation And Biological Applications Of Organotin(Iv) Derivatives Of 3-(N-Naphthylaminocarbonyl)-2-Propenoic Acid, Sajjad Ahmad, Moazzam H. Bhatti, Saqib Ali, Fiaz Ahmed
Spectroscopic Characterisation And Biological Applications Of Organotin(Iv) Derivatives Of 3-(N-Naphthylaminocarbonyl)-2-Propenoic Acid, Sajjad Ahmad, Moazzam H. Bhatti, Saqib Ali, Fiaz Ahmed
Turkish Journal of Chemistry
In an effort to develop new organotin materials for investigation and biocidal evaluation, a series of compounds with the general formula R_{4 - n}SnL_n (where R = CH_3, n-C_4H_9, C_6H_5, C_6H_5CH_2 and L = 3-(N-naphthylaminocarbonyl)-2-propenoic acid) were synthesised, and characterised by elemental analysis, IR, multinuclear (^1H, ^{13}C and ^{119}Sn) NMR, ^{119m}Sn Mössbauer spectroscopy and mass spectrometry. The biological activity of these compounds against various bacteria and fungi was investigated. All of the compounds were active against the fungi tested with a few exceptions. These compounds also showed significant antibacterial activity. LD_{50} data show that the investigated compounds have significant toxicity.
Antioxidant Activities Of The Extracts And Components Of Teucrium Orientale L. Var. Orientale, Ahmet Çakir, Ahmet Mavi̇, Cavi̇t Kazaz, Ali̇ Yildirim, Ömer İrfan Küfrevi̇oğlu
Antioxidant Activities Of The Extracts And Components Of Teucrium Orientale L. Var. Orientale, Ahmet Çakir, Ahmet Mavi̇, Cavi̇t Kazaz, Ali̇ Yildirim, Ömer İrfan Küfrevi̇oğlu
Turkish Journal of Chemistry
The effects of the developing stages of Teucrium orientale L. var. orientale on the antioxidant and DPPH radical scavenging activities of the extracts obtained with different organic solvents were investigated. The aerial parts of the plant samples were collected at the budding, flowering and vegetative stages and then the plant samples were extracted separately with petroleum ether, chloroform, acetone and methanol. The antioxidant activities of the extracts were evaluated using 2 different tests: the thiocyanate method and scavenging of the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical. The acetone and methanol extracts of all of the harvesting stages and chloroform extracts of the budding …
Synthesis And Biological Activities Of N-Alkyl Derivatives Of O-, M-, And P-Nitro (E)-4-Azachalcones And Stereoselective Photochemistry In Solution, With Theoretical Calculations, Nuretti̇n Yayli, Osman Üçüncü, Ahmet Yaşar, Murat Küçük, Nuran Yayli, Emi̇ne Akyüz, Şengül Alpay Karaoğlu
Synthesis And Biological Activities Of N-Alkyl Derivatives Of O-, M-, And P-Nitro (E)-4-Azachalcones And Stereoselective Photochemistry In Solution, With Theoretical Calculations, Nuretti̇n Yayli, Osman Üçüncü, Ahmet Yaşar, Murat Küçük, Nuran Yayli, Emi̇ne Akyüz, Şengül Alpay Karaoğlu
Turkish Journal of Chemistry
The N-alkyl derivatisation and photochemical dimerisation of 3 o-, m-, and p-nitro substituted 4-azachalcones (1-3) yielded 3 new o-, m-, and p-nitro substituted (E)-N-decyl-4-azachalconium bromides, (2E)-1-(2-nitrophenyl)-3-(N-decyl-4-pyridinium bromide)-2-propen-1-one (4), (2E)-1-(3-nitrophenyl)-3-(N-decyl-4-pyridinium bromide)-2-propen- 1-one (5), and (2E)-1-(4-nitrophenyl)-3-(N-decyl-4-pyridinium bromide)- 2-propen-1-one (6), and 3 new dimers in solution, (1\beta, 2\alpha)-di- (3-nitrobenzoyl)-(3\beta, 4\alpha)-di-(4-pyridinyl) cyclobutane (7), (1\beta, 2\alpha)-di-(4-nitrobenzoyl)-(3\beta,4\alpha)-di-(4-pyridinyl) cyclobutane (8a), and (1\beta, 2\beta)-di-(4-nitrobenzoyl)-(3\beta, 4\alpha)-di-(4-pyridinyl)cyclobutane (8b), stereoselectively. The monomeric compounds showed good antimicrobial activity against test micro-organisms. The most sensitive micro-organisms were Gram-positive bacteria. The monomers also showed high antioxidant activity, while the dimerisation products 7-8a,b were less active. Compound 6 was found to have similar or even …
Chemical Constituents Of Galium Tortumense, Zühal Güvenalp, Nurcan Kiliç, Cavi̇t Kazaz, Yusuf Kaya, L. Ömür Demi̇rezer
Chemical Constituents Of Galium Tortumense, Zühal Güvenalp, Nurcan Kiliç, Cavi̇t Kazaz, Yusuf Kaya, L. Ömür Demi̇rezer
Turkish Journal of Chemistry
From the aerial parts of Galium tortumense Ehrend & Schönb.-Tem., 8 iridoid glycosides, a flavonol glycoside, a oleanane-type triterpene acid, an ursan-type triterpene acid and a sterol were isolated. The structures of the compounds were elucidated by high field 1D and 2D NMR and EIMS spectroscopies.
Iridoids, Flavonoids And Monoterpene Glycosides From Galium Verum Subsp. Verum, L. Ömür Demi̇rezer, Fi̇li̇z Gürbüz, Zühal Güvenalp, Karsten Ströch, Axel Zeeck
Iridoids, Flavonoids And Monoterpene Glycosides From Galium Verum Subsp. Verum, L. Ömür Demi̇rezer, Fi̇li̇z Gürbüz, Zühal Güvenalp, Karsten Ströch, Axel Zeeck
Turkish Journal of Chemistry
From the aerial parts of Galium verum subsp. verum L. were isolated 7 iridoid glycosides, asperuloside (1), asperulosidic acid (2), deacetyl-asperulosidic acid (3), monotropein (4), 6-O-epi-acetylscandoside (5), daphylloside (6) and deacetyl-daphylloside (7); 2 flavonol glycosides, astragalin [= kaempferol 3-O-\beta-glucopyranoside] (8) and rutin [= quercetin 3-O- rutinoside] (9); and 2 monoterpene glycosides, betulalbuside A (10) and (2E)-2,6-dimethyl-2,7-octadien-1,6-diol-6-O-\beta -glucopyranoside (11). The structures of the isolates were established by 1D and 2D NMR spectroscopy in combination with IR, UV and ESI-MS analysis.
Dichloride[1-(2,4,6-Trimethylbenzyl)-3-(Biphenyl-2-Ylmethyl)-Imidazolidin- 2-Ylidine (\Eta^6-Hexamethylbenzene)]Ruthenium, Hakan Arslan, Donald Van Derveer, İsmai̇l Özdemi̇r, Sedat Yaşar, Beki̇r Çeti̇nkaya
Dichloride[1-(2,4,6-Trimethylbenzyl)-3-(Biphenyl-2-Ylmethyl)-Imidazolidin- 2-Ylidine (\Eta^6-Hexamethylbenzene)]Ruthenium, Hakan Arslan, Donald Van Derveer, İsmai̇l Özdemi̇r, Sedat Yaşar, Beki̇r Çeti̇nkaya
Turkish Journal of Chemistry
The single crystal X-ray structure of the imidazolidin ruthenium complex, C_{38}H_{46}N_2Cl_2Ru, was determined. The complex is an orthorhombic space group Pbca with a = 17.3586(32) Å, b = 14.4447(27) Å, c = 27.4325(52) Å, and V = 6878.466(4) Å^3 with Z = 8 for D_{calc} = 1.357 g/cm^3. It exhibits the expected 3-legged piano stool geometry. There is one coordination bond of the ruthenium atom with the electrons of the \eta^6-hexamethylbenzene, 2 symmetrical Ru-Cl bonds, and one Ru-C bond involving the imidazole ring. The coordination around the ruthenium atom is 4-fold, which in this is case is pseudo-tetrahedral.
Performance Comparison Between Monolithic C18 And Conventional C18 Particle-Packed Columns In The Liquid Chromatographic Determination Of Propranolol Hcl, Sami El Deeb, Hermann Watzig
Performance Comparison Between Monolithic C18 And Conventional C18 Particle-Packed Columns In The Liquid Chromatographic Determination Of Propranolol Hcl, Sami El Deeb, Hermann Watzig
Turkish Journal of Chemistry
Monolithic and conventional particle-packed columns were applied for the determination of propranolol hydrochloride in the presence of its 2 main degradation products, 3-(1-naphthyloxy)-propane-1,2- diol and 4-isopropyl-1,7-bis-(1-naphthyloxy)-4-azaheptane-2,6-diol. The separations were investigated on monolithic columns at flow rates from 1 to 9 mL/min. Fast and efficient separation was obtained by monolithic columns. The analysis time was decreased by about 5-fold on monolithic columns at a flow rate of 4 mL/min, while maintaining sufficient resolution between propranolol and its degradation products. The method was validated using a set of 3 monolithic columns and compared to a conventional (Superspher) C18 column. The precision for …
Synthesis Of Some New Functionalized Octasilsesquioxane Hybrid Nanoclusters. Iii. Potential Of The Octameric Clusters As Hydraulic Lubricating Fluids, Enock O. Dare
Turkish Journal of Chemistry
The reaction of suitable organic compounds such as \omega -halo-1-alkenes, allyltrichlorosilane or 2-methyl-3-butyn-2-ol in combination with a well-defined inorganic silsesquioxane, H_8Si_8O_{12} A cores, leads to covalently bound organic-inorganic hybrid materials in high yields. The hydraulic fluid properties of these viscous hybrid materials were evaluated and compared with those of some commercially available hydraulic fluids: Mobil EAL 224H, Super-V (AP) and Puroil SHO. The results showed that most silsesquioxane semi-liquids possess hydraulic fluid properties comparable to those of the 3 commercial lubricants.
Superabsorbency, Ph-Sensitivity And Swelling Kinetics Of Partially Hydrolyzed Chitosan-G-Poly(Acrylamide) Hydrogels, Ali Pourjavadi, Gholam Reza Mahdavinia
Superabsorbency, Ph-Sensitivity And Swelling Kinetics Of Partially Hydrolyzed Chitosan-G-Poly(Acrylamide) Hydrogels, Ali Pourjavadi, Gholam Reza Mahdavinia
Turkish Journal of Chemistry
Acrylamide (AAm) monomer was directly grafted onto chitosan using ammonium persulfate (APS) as an initiator and methylenebisacrylamide (MBA) as a crosslinking agent under an inert atmosphere. Two factors affecting the swelling capacity of the obtained hydrogel, AAm and MBA concentrations, were studied. The polymer structures were characterized by FTIR spectroscopy. Water absorbencies of the hydrogels were compared between before and after the alkaline hydrolysis treatment. Saponification of chitosan-g-poly(acrylamide) (chitosan-g-PAAm) with a hot sodium hydroxide solution gave rise to a high water absorbency. Swelling of the hydrogel samples in saline solution (0.15 mol/L NaCl, CaCl_2 and AlCl_3) was examined. Swelling capacity …
Synthesis And Vibrational Spectroscopic Study Of Some Metal(Ii) Halide And Tetracyanonickelate Complexes Of Isonicotinic Acid, Ahmet Ataç, Fehmi̇ Bardak
Synthesis And Vibrational Spectroscopic Study Of Some Metal(Ii) Halide And Tetracyanonickelate Complexes Of Isonicotinic Acid, Ahmet Ataç, Fehmi̇ Bardak
Turkish Journal of Chemistry
The M(IN)_2Ni(CN)_4 [where M: Cu, Mn, Zn, IN: Isonicotinic acid, abbreviated to M-Ni-IN] tetracyanonickelate and some metal halide complexes with the following stoichiometries: Cu(IN)X_2 (X:Br,I), Cd(IN)_2X_2, (X:Cl,Br), and Zn(IN)_4X_2 (X:Br,I) were synthesized for the first time. Their FT-IR spectra were reported in the 4000-400 cm^{-1} region. Vibrational assignments were given for all the observed bands. The analysis of the vibrational spectra indicates that there are some structure-spectrum correlations. For a given series of isomorphous complexes, the sum of the difference between the values of the vibrational modes of uncoordinated isonicotinic acid that were coordinated to the metal ion isonicotinic acid …
Attempted Synthesis Of 1-Cyclohepta-1,2-Dien-1-Ylbenzene And Wurtz-Like Condensation Products In The Reaction Of 1-(2,3-Dibromocyclohept-1-En-1-Yl)Benzene With Zinc, Mustafa Ceylan, Yakup Budak, M. Burcu Gürdere
Attempted Synthesis Of 1-Cyclohepta-1,2-Dien-1-Ylbenzene And Wurtz-Like Condensation Products In The Reaction Of 1-(2,3-Dibromocyclohept-1-En-1-Yl)Benzene With Zinc, Mustafa Ceylan, Yakup Budak, M. Burcu Gürdere
Turkish Journal of Chemistry
7,7-Dibromo-1-phenylbicyclo[4.1.0]heptane 4 was synthesized and its thermal and silver ion-catalyzed rearrangements were studied. Alcohol 8 was converted to 1-(2,3-dibromocyclohept-1-en-1-yl)benzene 6. The zinc-mediated elimination of 1-(2,3-dibromocyclohept-1-en-1-yl)benzene 6 resulted in the formation of 2 isomeric Wurtz-like condensation products 15 and 16 (whose structural assignments were based on ^1H-and ^{13}C-NMR spectral data) instead of the expected 1-cyclohepta-1,2-dien-1-ylbenzene 14.
A New Flame-Retardant Polyamide Containing Phosphine Oxide And N,N-(4,4-Diphenylether) Moieties In The Main Chain: Synthesis And Characterization, Khalil Faghihi
Turkish Journal of Chemistry
A new flame-retardant polyamide containing phosphine oxide moieties in the main chain was synthesized from the solution polycondensation reaction of bis(3-aminophenyl) phenyl phosphine oxide with N,N-(4,4-diphenylether) bis trimellitimide, using thionyl chloride, N-methyl-2-pyrolidone, and pyridine as condensing agents. This new polymer was obtained in high yield (92%), has high inherent viscosity (0.73 dL/g), and was characterized by elemental analysis, FT-IR spectroscopy, thermal gravimetric analysis (TGA and DTG), and solubility testing. Furthermore, another polyamide was prepared by the solution polycondensation reaction of N,N-(4,4-diphenylether) bis trimellitimide with 1,4-phenylene diamine, and its flame-retardant behavior was compared to that of the previous one.
The Impact Of Polyacrylamide Molecular Weight On Its Adsorption Behavior At The Gold/Acidic Solution Interface, Dragica B. Chamovska, Toma P. Grchev, Maja V. Cvetkovska
The Impact Of Polyacrylamide Molecular Weight On Its Adsorption Behavior At The Gold/Acidic Solution Interface, Dragica B. Chamovska, Toma P. Grchev, Maja V. Cvetkovska
Turkish Journal of Chemistry
Adsorption isotherms for polyacrylamide (PAA) on polycrystalline gold, from sulfuric acid (potential range 0-2.0 V/she; 293 K), were obtained by means of cyclic voltammetry with simultaneous monitoring of the double-layer capacity. The Frumkin isotherm indicates that relatively strong attractive forces are present (a = 0.8-1.0), and the Gibbs energies range between 43 and 56 kJ mol^{-1}. The coverage (\theta) of the metal surface with polymer molecules depends on the molar concentration of PAA, as well as on its molecular weight, and the size of the statistical polymer coil in the solution (R_G = 7.49 \times 10^{-3} \times M_n^{0.64}/nm). The adsorption …
Simple Synthesis Of \Alpha -Oxime Derivatives Of 2-Ketomethyl Quinolines Under Mild And Heterogeneous Conditions, Javad Safari, Mehdi Adib, Firouzeh Sheibani, Zahra Sadeghi
Simple Synthesis Of \Alpha -Oxime Derivatives Of 2-Ketomethyl Quinolines Under Mild And Heterogeneous Conditions, Javad Safari, Mehdi Adib, Firouzeh Sheibani, Zahra Sadeghi
Turkish Journal of Chemistry
2-Ketomethyl quinolines are converted to their \alpha-oximinoketone derivatives in quantitative yields using sodium nitrite in the presence of silica sulfuric acid as nitrosating agent under mild and heterogeneous conditions.
Synthesis And Properties Of Triazol-5-One Substituted Phthalocyanines By Microwave Irradiation, Bahatti̇n Kahveci̇, Selami̇ Şaşmaz, Musa Özi̇l, Ci̇han Kantar, Başak Koşar, Orhan Büyükgüngör
Synthesis And Properties Of Triazol-5-One Substituted Phthalocyanines By Microwave Irradiation, Bahatti̇n Kahveci̇, Selami̇ Şaşmaz, Musa Özi̇l, Ci̇han Kantar, Başak Koşar, Orhan Büyükgüngör
Turkish Journal of Chemistry
Triazol-5-one substituted phthalocyanines were prepared quickly by the reaction of 4-nitrophthalonitrile with anhydrous metal salts in DBU (1,8-diazabicyclo[5,4,0]undec-7-ene) and DMAE (dimethylaminoethanol) by microwave irradiation. Microwave yields were higher than those of the conventional synthesis methods. All of these complexes are insoluble in polar solvents such as ethanol, ethyl acetate and chloroform. The characterization of the compounds was accomplished by elemental analysis, ^1H NMR (for I and II), ^{13}C NMR (for I and II), IR and UV-Vis spectral data. In addition, the structure of the starting material (I) was determined by single crystal diffraction.
Synthesis, Spectroscopic (Ft-Ir, ^1h, ^{13}C, Mass Spectrometry), And Biological Investigation Of Five-Coordinated Germanium-Substituted Tricyclohexyl Antimony Dipropionates: Crystal Structure Of Tricyclohexylantimony Dibromide, Muhammad Kaleem Khosa, Muhammad Mazhar, Saqib Ali, Kieran C. Molloy, Sarim Dastgir, Farkhanda Shaheen
Synthesis, Spectroscopic (Ft-Ir, ^1h, ^{13}C, Mass Spectrometry), And Biological Investigation Of Five-Coordinated Germanium-Substituted Tricyclohexyl Antimony Dipropionates: Crystal Structure Of Tricyclohexylantimony Dibromide, Muhammad Kaleem Khosa, Muhammad Mazhar, Saqib Ali, Kieran C. Molloy, Sarim Dastgir, Farkhanda Shaheen
Turkish Journal of Chemistry
A series of five-coordinated germanium-substituted tricyclohexylantimony dipropionates have been synthesized and characterized by different instrumental techniques, such as elemental analyses, FT-IR, multinuclear NMR (^1H, ^{13}C) and mass spectrometry. These compounds have also been screened against different microbes and they showed good activity against different bacteria that was comparable to the reference drugs. The crystal structure of the precursor (C_6H_{11})_3SbBr_2 is reported here, which showed that the antimony atom in an asymmetric unit exists in trigonal bipyramidal geometry, having space group C2/c with the monoclinic crystal system.