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A New And Simple Procedure For The Polarographic Speciation And Determination Of Trace Inorganic As(Iii) And As(V) Species, Ülkü Ünal, Güler Somer
A New And Simple Procedure For The Polarographic Speciation And Determination Of Trace Inorganic As(Iii) And As(V) Species, Ülkü Ünal, Güler Somer
Turkish Journal of Chemistry
A new and simple differential pulse polarographic method was developed for the trace determination of As(III) and As(V) species in the same sample. Among several electrolytes, 0.1 M HCl was found to be the most suitable. As(III) had 3 peaks in this medium, and the peak at --0.82 V was chosen because of its peak shape and response to standard additions. In this medium, the limit of detection for As(III) was found to be 1.5 \times 10^{-7} M. Since As(V) is not electroactive, it had to be reduced first into As(III). For this purpose, KI in an acidic and hot …
A Computational Study On Substituted Diazabenzenes, Selçuk Gümüş
A Computational Study On Substituted Diazabenzenes, Selçuk Gümüş
Turkish Journal of Chemistry
The results of computational calculations on the aromaticity of the monosubstituted diazabenzenes (pyridazine, pyrimidine, and pyrazine) are reported herein. The aromaticity of the parent heterocycle was enhanced by substitution of strong electron-withdrawing groups. The effects of the position of the substituent on the aromaticity and the stability of the system were also investigated by studying all possible derivatives of the systems.
Polyphenolic Compounds From Geranium Purpureum Vill. Growing In Turkey, Di̇dem Şöhretoğlu, Mahmut Koray Sakar, Olov Sterner
Polyphenolic Compounds From Geranium Purpureum Vill. Growing In Turkey, Di̇dem Şöhretoğlu, Mahmut Koray Sakar, Olov Sterner
Turkish Journal of Chemistry
Two new flavonol derivatives, Geranioside A (kaempferol 3-[3-(\alpha-rhamnopyranosyl)-4-oxy-5-hydroxy-6-methyl-3,4-dihyropyran-2H- 2-pyranoside]) (1) and Geranioside B (quercetin 3-[3-(\alpha-rhamnopyranosyl)- 4-oxy-5-hydroxy-6-methyl-3,4-dihyropyran-2H-2-pyranoside]) (2), along with 5 known flavonols (quercetin (3), kaempferol (4), quercetin 4'-O-\beta -glucopyranoside (5), quercetin 3-O-\beta -glucopyranoside (6), and kaemferol-3-O-\beta -glucopyranoside (7)), a gallic acid derivative (methyl gallate (8)), and a hydrolysable tannin (pusilagin (9)), were isolated from the aerial parts of Geranium purpureum. The structures of the isolated compounds were elucidated on the basis of UV, IR, and 1D- and 2D-NMR experiments as well as TOF-MS.
Amphiphilic And Chiral Unsymmetrical Perylene Dye For Solid-State Dye-Sensitized Solar Cells, Hurmus Refiker, Hüri̇ye İci̇l
Amphiphilic And Chiral Unsymmetrical Perylene Dye For Solid-State Dye-Sensitized Solar Cells, Hurmus Refiker, Hüri̇ye İci̇l
Turkish Journal of Chemistry
A novel amphiphilic, unsymmetrically substituted N-((2S)-2-aminohexanoic acid)-N'-[(S)-1-phenylethyl]-3,4,9,10- perylenetetracarboxydiimide with 2 different chiral centers was synthesized and characterized. Chiral amphiphilicity, which can be tunable between hydrophilic and hydrophobic parts, is responsible for controlled self-assembly through intermolecular hydrogen bonding (N-H \cdots O). The product showed high thermal stability but partial solubility in common organic solvents. We observed 2 isosbestic points at 533 and 611 nm, confirming the presence of overlapped monomer and excimer emissions in the temperature range of 10-80 °C. Fluorescence quenching in m-cresol was attributed to charge-transfer interactions. Importantly, the excited state of the chiral dye can decay only by …
Facile And Convenient Synthesis Of Pyrimidine, 4h-3,1-Benzoxazin-4-One, Pyrazolo[5,1-B]Quinazoline, Pyrido[1,2-A]Quinazoline, And Chromeno[3' ,4' :4,5]Pyrido[1,2-A]Quinazoline Derivatives, Yousry A. Ammar, Samir Bondock, Abdallah G. El-Sehmi, Mohamed S.A El_Gaby, Ahmed M. Fouda, Hamdy Kh. Thabet
Facile And Convenient Synthesis Of Pyrimidine, 4h-3,1-Benzoxazin-4-One, Pyrazolo[5,1-B]Quinazoline, Pyrido[1,2-A]Quinazoline, And Chromeno[3' ,4' :4,5]Pyrido[1,2-A]Quinazoline Derivatives, Yousry A. Ammar, Samir Bondock, Abdallah G. El-Sehmi, Mohamed S.A El_Gaby, Ahmed M. Fouda, Hamdy Kh. Thabet
Turkish Journal of Chemistry
A convenient synthesis of a series of pyrimidine, 4H-3,1-benzoxazin-4-one, pyrazolo[5,1-b]quinazoline, pyrido[1,2-a]quinazoline, and chromeno[3' ,4' :4,5]pyrido[1,2-a]quinazoline derivatives, via the reactions of versatile and readily accessible methyl 2-(2-cyanoacetamido)benzoate (1) with the appropriate reagents, is described here.
Synthesis And Antimicrobial Activity Of Novel 2-(Pyridin-2-Yl)Thieno[2,3-D]Pyrimidin-4 (3h)-Ones, Nitin G. Haswani, Sanjaykumar B. Bari
Synthesis And Antimicrobial Activity Of Novel 2-(Pyridin-2-Yl)Thieno[2,3-D]Pyrimidin-4 (3h)-Ones, Nitin G. Haswani, Sanjaykumar B. Bari
Turkish Journal of Chemistry
In the present study, some new 2-(pyridin-2-yl)thieno[2,3-d] pyrimidin-4(3H)-ones derivatives (IIa-o) were synthesized. The target compounds (IIa-o) were synthesized through the acid catalyzed condensation of 2-cyano, 3-cyano, and 4-cyano-pyridines with various 2-amino-3-carbethoxythiophenes (Ia-e). All thiophene derivatives were synthesized by Gewald reaction. The structures of the newly synthesized compounds were confirmed by UV-Visible, FT-IR, ^1H-NMR, and mass spectral studies. All synthesized compounds were evaluated for their antimicrobial activity against various gram-positive and gram-negative bacterial and fungal strains. Amongst the synthesized compounds IIa, IIb, IId, IIe, and IIm were found to be active.
Chemistry Of 2-Aminothiophene-3-Carboxamide And Related Compounds, Moustafa A. Gouda, Moged A. Berghot, Ghada E. Abd El-Ghani, Khaled M. Elattar, Abd El Galil M. Khalil
Chemistry Of 2-Aminothiophene-3-Carboxamide And Related Compounds, Moustafa A. Gouda, Moged A. Berghot, Ghada E. Abd El-Ghani, Khaled M. Elattar, Abd El Galil M. Khalil
Turkish Journal of Chemistry
This review describes the synthesis and reactions of 2-aminothiophene-3-carboxamides as building blocks for the syntheses of polyfunctionalized heterocyclic compounds.
Simultaneous Determination Of Copper And Cadmium In Environmental Water And Tea Samples By Adsorptive Stripping Voltammetry, Mohammad Bagher Gholivand, Alireza Pourhossein, Mohsen Shahlaei
Simultaneous Determination Of Copper And Cadmium In Environmental Water And Tea Samples By Adsorptive Stripping Voltammetry, Mohammad Bagher Gholivand, Alireza Pourhossein, Mohsen Shahlaei
Turkish Journal of Chemistry
A sensitive and selective method for the simultaneous determination of copper and cadmium in seawater, river water, and tea samples is described. The method is based on the adsorptive accumulation of 2,2--dithiosalicylic acid complexes of these elements onto a hanging mercury drop electrode, followed by reduction of adsorbed species by voltammetric scan using differential pulse modulation. Optimal analytical conditions were as follows: ligand concentration of 11 nM, pH of 9.5, and an adsorption potential at --300 mV versus Ag/AgCl, with an accumulation time of 60 s. The peak currents are proportional to the concentration of copper and cadmium over the …
The Sorption Of Cadmium(Ii) Ions On Mercerized Rice Husk And Activated Carbon, Mas Rosemal Hakim Mas Haris, Nor Aimi Abdul Wahab, Chong Wan Reng, Baharin Azahari, Kathiresan Sathasivam
The Sorption Of Cadmium(Ii) Ions On Mercerized Rice Husk And Activated Carbon, Mas Rosemal Hakim Mas Haris, Nor Aimi Abdul Wahab, Chong Wan Reng, Baharin Azahari, Kathiresan Sathasivam
Turkish Journal of Chemistry
This work describes the removal of Cd(II) ions in aqueous solution by unmodified and base-modified rice husk (RH) as compared to that by activated carbon (AC). Mercerization of RH was carried out by using dilute solutions (0.013 M) of NaOH, KOH, and Ca(OH)_2. The experiments were conducted in duplicate under 1-batch and 2-batch treatments. In the 1-batch treatment, a fresh 200 mg of each adsorbent was used to study the sorption of the Cd(II) ions from 100-mL solutions at an initial concentration of 5 mg L^{-1}. The adsorption percentage increased in the order of unmodified RH (80.13 \pm 0.46%) < Ca(OH)_2-modified RH (90.74 \pm 0.18%) < NaOH-modified RH (93.36 \pm 0.23%) \le KOH-modified RH (93.78 \pm 0.27%) < AC (98.4 \pm 0.18%). In the 2-batch treatment, a fresh 100 mg of each adsorbent was placed in 100-mL solutions at an initial concentration of 5 mg L^{-1} of Cd(II) ions for 30 min, and the resulting solutions were filtered. The filtrates were subjected to another fresh 100 mg of each adsorbent for an additional 30 min. The percentage removal of the metal ion using the 2-batch treatment for unmodified RH, base-modified RH, and AC was 97.71%, 98.00 \pm 1.00%, and nearly 100%, respectively.
Synthesis And Structural Analysis Of A Regular Cu-Mg-Al Hydrotalcite-Like Compound, Jiansong Wu, Yingkai Xiao, Yuping Liu, Wanbang Xu, Meifang Liang, Jian Cheng, Jianping Wan, Lingzhu Chen
Synthesis And Structural Analysis Of A Regular Cu-Mg-Al Hydrotalcite-Like Compound, Jiansong Wu, Yingkai Xiao, Yuping Liu, Wanbang Xu, Meifang Liang, Jian Cheng, Jianping Wan, Lingzhu Chen
Turkish Journal of Chemistry
A fine-quality, regular Cu-Mg-Al hydrotalcite-like compound was synthesized via the glycothermal method using CuCl_2 \cdot 2H_2O, MgCl_2 \cdot 6H_2O, AlCl_3 \cdot 6H_2O, and Na_2CO_3 as raw materials and sodium hydroxide as the precipitant. Hydrotalcite samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, thermogravimetric-differential thermal analysis, and Brunauer-Emmett-Teller N_2 surface area measurements. The influence of glycol content on the characteristics of the sample was investigated. The results show that the glycol content in the system had a greater impact on regular hydrotalcite with an intercalated structure. A Cu-Mg-Al hydrotalcite-like compound with a well-defined …
Determination Of Ni(Ii) With Picolinaldehyde-4-Phenyl-3-Thiosemicarbazone Used As A Chromogenic Reagent In A Nonionic Micellar System, Aamna Balouch, Muhammad Iqbal Bhanger, Farah Naz Talpur, Willie L. Hinze
Determination Of Ni(Ii) With Picolinaldehyde-4-Phenyl-3-Thiosemicarbazone Used As A Chromogenic Reagent In A Nonionic Micellar System, Aamna Balouch, Muhammad Iqbal Bhanger, Farah Naz Talpur, Willie L. Hinze
Turkish Journal of Chemistry
Spectrophotometric determination of Ni(II) was carried out using picolinaldehyde-4-phenyl-3-thiosemicarbazone (PAPT) as a complexing/chromogenic reagent. The possibility of using a micellar system was explored to enhance the degree of detection and allow a more sensitive spectrophotometric method for the determination of nickel ions. The anionic surfactant Triton X-100 greatly enhanced the molar absorptivity and limit of detection relative to that observed with bulk water or an organic solvent. The linear calibration graphs were obtained for 0.5-2.0 mg L^{-1} and 0.001-1.0 mg L^{-1} of Ni(II) in aqueous and surfactant media, respectively. Using this approach, the limit of detection for the PAPT-Ni(II) complex …
Interference Elimination Studies During The Determination Of Trace Elements In Cow Liver Using Differential Pulse Polarography, Ümmi̇han T. Yilmaz, Güler Somer
Interference Elimination Studies During The Determination Of Trace Elements In Cow Liver Using Differential Pulse Polarography, Ümmi̇han T. Yilmaz, Güler Somer
Turkish Journal of Chemistry
The liver is known to accumulate many trace elements; thus it is very important to determine their level in a sensitive way. The objective of this study was to develop a simple method for the simultaneous determination of trace elements in cow liver in which the elimination of interference can be accomplished. It was observed that Cd, Pb, Zn, and Cu ions could not be determined correctly in the presence of Se(IV), because of interference of Se. It was shown that this interference could be eliminated by using pH 8.5 NaAc electrolyte. In this medium first Cd and Zn were …
Inclusion And Release Of Theophylline From Chitosan Based Microparticles, Niculina Popa, Ovidiu Novac, Lenuta Profire, Doina Hritcu, Marcel Ionel Popa
Inclusion And Release Of Theophylline From Chitosan Based Microparticles, Niculina Popa, Ovidiu Novac, Lenuta Profire, Doina Hritcu, Marcel Ionel Popa
Turkish Journal of Chemistry
Chitosan (CS) based microparticles for controlled release of theophylline (THP) were obtained by ionic gelation. The microparticles were characterized by laser diffraction analysis (particle size), scanning electron microscopy (SEM), FTIR spectroscopy, and thermogravimetric analysis. The average diameter of the CS-THP microparticles was 182 \mu m. The FTIR spectra confirmed that new hydrogen bonds had formed between the carbonylic group belonging to THP and the amino group of CS, while the thermogravimetric analysis showed a modified stability in the obtained particles and confirmed the presence of an interaction between the drug and CS. The THP release process was monitored for up …
Synthesis And Characterization Of Hybrid Congo Red From Chloro-Functionalized Silsesquioxanes, Ahmet Gültek
Synthesis And Characterization Of Hybrid Congo Red From Chloro-Functionalized Silsesquioxanes, Ahmet Gültek
Turkish Journal of Chemistry
Congo red dye has been bonded to the functionalized octameric polyhedral silsesquioxanes (POSS), which were prepared by hydrolytic condensation of chloro-functionalized organosilicon monomers in the presence of a catalyst. The binding reaction of congo red to the POSS with chloro groups was achieved via the addition of the congo red via NaCl elimination. The structures of POSS with chloro side groups provided an attractive site for binding congo red that not only retains some of its characteristic properties, but also has exceptional hybrid properties possessed by the silica. The dye characteristics of the material were determined by means of UV …
A Novel Glucose Chemiluminescence Biosensor Based On A Rhodanine Derivative Chemiluminescence System And Multilayer-Enzyme Membrane, Jinghua Yu, Lei Ge, Ping Dai, Congcong Zhang, Shenguang Ge, Jiadong Huang
A Novel Glucose Chemiluminescence Biosensor Based On A Rhodanine Derivative Chemiluminescence System And Multilayer-Enzyme Membrane, Jinghua Yu, Lei Ge, Ping Dai, Congcong Zhang, Shenguang Ge, Jiadong Huang
Turkish Journal of Chemistry
Using glucose oxidase as a model enzyme, a novel rhodanine derivative chemiluminescence biosensor for the determination of glucose was formed based on multilayer-enzyme membrane as receptor, which was assembled via layer-by-layer assembly of sol-gel and glucose oxidase-gold nano-particles inside a glass tube. Compared with the traditional chemiluminescence biosensor, the proposed biosensor had some remarkable advantages, such as good selectivity of substrate, good response performance, good stability, good sensitivity, and longer service life. The linear range was from 1.0 \times 10^{-6} to 5.0 \times 10^{-2} mol L^{-1} (r = 0.9991). The detection limit was 5.0 \times 10^{-7} mol L^{-1}. In this …
Preparation And Characterization Of Anticancer Drug-Loaded Implantable Plga Microparticles, Meltem Çeti̇n, İmran Vural, Alptuğ Ati̇la, Yücel Kadioğlu
Preparation And Characterization Of Anticancer Drug-Loaded Implantable Plga Microparticles, Meltem Çeti̇n, İmran Vural, Alptuğ Ati̇la, Yücel Kadioğlu
Turkish Journal of Chemistry
This article describes the preparation and characterization of anticancer drug-loaded poly(lactide-co-glycolide) (PLGA) microparticles. PLGA microparticles loaded with doxorubicin HCl (DOX) were prepared via o/w emulsion solvent evaporation. The release characteristics, encapsulation efficiency, size, and morphology of the PLGA microparticles were also determined. A cytotoxicity test was performed by using Glioma RG2 cancer cells to investigate the cytotoxicity of DOX-loaded PLGA microparticles. The DOX-loaded PLGA microparticles had an average diameter of 500 \pm 9 nm. The DOX encapsulation efficiency and drug loading were 22.75% and 0.78%, respectively. DOX-loaded PLGA microparticles displayed a significant cytotoxicity toward the RG2 cells as compared to …
Biotransformation Of Danazol By Fusarium Solani And Gibberella Fujikuorii, And Prolyl Endopeptidase Inhibition Studies Of Transformed Products, Azizuddin Shaikh, Muhammad Iqbal Choudhary
Biotransformation Of Danazol By Fusarium Solani And Gibberella Fujikuorii, And Prolyl Endopeptidase Inhibition Studies Of Transformed Products, Azizuddin Shaikh, Muhammad Iqbal Choudhary
Turkish Journal of Chemistry
Biotransformation of danazol (17\beta-hydroxy-17\alpha-pregna-2,4-dien-20-yno-[2,3-d] isoxazole) (1) on fermentation with Fusarium solani yielded 17\beta-hydroxy-2-(hydroxymethyl)-17\alpha -pregn-4-en-20-yn-3-one (2) and 17\beta -hydroxy-2-(hydroxymethyl)-17\alpha-pregna-1,4-dien-20-yn-3-one (3), while the fermentation of 1 with Gibberella fujikuorii yielded compound 2 only. The structures of these compounds were deduced on the basis of modern spectroscopic techniques. Prolyl endopeptidase inhibition activities of danazol (1) and its transformed products 2 and 3 are also studied.
Determination Of Ceftriaxone, Ceftizoxime, Paracetamol, And Diclofenac Sodium By Capillary Zone Electrophoresis In Pharmaceutical Formulations And In Human Blood Serum, Amber Solangi, Saima Memon, Arfana Mallah, Najma Memon, Muhammad Yar Khuhawar, Muhammad Iqbal Bhanger
Determination Of Ceftriaxone, Ceftizoxime, Paracetamol, And Diclofenac Sodium By Capillary Zone Electrophoresis In Pharmaceutical Formulations And In Human Blood Serum, Amber Solangi, Saima Memon, Arfana Mallah, Najma Memon, Muhammad Yar Khuhawar, Muhammad Iqbal Bhanger
Turkish Journal of Chemistry
A simple and fairly fast capillary zone electrophoresis method has been developed for the determination and separation of ceftriaxone, ceftizoxime, paracetamol, and diclofenac sodium in a mixture, in pharmaceutical formulations, and in blood serum. A 50 mM sodium tetraborate background electrolyte solution (pH 9.0) was found to be suitable for separation of all the drugs. An uncoated fused-silica capillary of a total length of 57 cm (effective length 50 cm) was used for separation. All the analytes were completely separated within 8.0 min at an applied voltage of 30 kV and detection was performed at 214 nm .Validation of the …
An Efficient One-Pot Synthesis Of Dihydropyrimidinones Catalyzed By Zirconium Hydrogen Phosphate Under Solvent-Free Conditions, Mustafa Küçüki̇slamoğlu, Şenol Beşoluk, Mustafa Zengi̇n, Mustafa Arslan, Mehmet Nebi̇oğlu
An Efficient One-Pot Synthesis Of Dihydropyrimidinones Catalyzed By Zirconium Hydrogen Phosphate Under Solvent-Free Conditions, Mustafa Küçüki̇slamoğlu, Şenol Beşoluk, Mustafa Zengi̇n, Mustafa Arslan, Mehmet Nebi̇oğlu
Turkish Journal of Chemistry
A simple, efficient, and practical procedure for the Biginelli reaction using zirconium hydrogen phosphate [Zr(H_2PO_4)_2] as a novel solid acid catalyst is described under solvent-free conditions in high yields. The catalyst exhibited remarkable reactivity and it is reusable.
Evaluation Of Solid-Phase Extraction Sorbent With Ketoimine Groups For The Preconcentration Of Benzene And Phenolic Compounds In Water, Iwona Rykowska, Wieslaw Wasiak
Evaluation Of Solid-Phase Extraction Sorbent With Ketoimine Groups For The Preconcentration Of Benzene And Phenolic Compounds In Water, Iwona Rykowska, Wieslaw Wasiak
Turkish Journal of Chemistry
The applicability of silica gel, modified with ketoimine groups, to solid phase extraction (SPE) was tested. Basic characteristics of the modified silica were determined using elemental analysis, and ^{29}Si CP MAS NMR spectroscopy, as well as measurement of specific surface area. Some applications of the sorbent studied to preconcentration and further determination of organic compounds, such as benzene, phenol, and o-chlorophenol, by means of solid-phase extraction (SPE) and gas chromatography are presented. The determined recovery rates were about 95%-98%.
Synthesis And Antimicrobial Activities Of Some New Biheterocyclic Compounds Containing 1,2,4-Triazol-3-One And 1,3,4-Thiadiazole Moieties, Ahmet Demi̇rbaş, Nesli̇han Demi̇rbaş, Hakan Bektaş, Hacer Bayrak, Şengül Alpay Karaoğlu
Synthesis And Antimicrobial Activities Of Some New Biheterocyclic Compounds Containing 1,2,4-Triazol-3-One And 1,3,4-Thiadiazole Moieties, Ahmet Demi̇rbaş, Nesli̇han Demi̇rbaş, Hakan Bektaş, Hacer Bayrak, Şengül Alpay Karaoğlu
Turkish Journal of Chemistry
2-(4-Amino-3-(4-chlorophenyl)-5-oxo-4,5--dihydro-1H-1,2,4-triazol- 1-yl)-N'-[(2,6-dihalogenophenyl)-methylene]acetohydrazides (3a,b) was obtained via the formation of 2-(4-amino-3-(4-chlorophenyl)-5-oxo-4,5- dihydro-1H-1,2,4-triazol-1-yl)acetohydrazide (2), which was obtained starting from 4-amino-5-(4-chlo\-rophenyl)-2,4-dihydro-3H-1,2,4-triazol-3-one (1) in 2 steps. 2-{[4-amino-3-(4-chlorophenyl)-5-oxo-4,5--dihydro-1H- 1,2,4-triazol-1-yl]acetyl}-N-phenylhydra-zine carbothioamide (4), which was prepared starting from 2, was converted to the corresponding 1,3,4-thiadiazole derivative (5) in acidic media. Moreover, the basic treatment of 4 resulted in the formation of 4-amino-5-(4-chlorophenyl)- 2-[(4-phenyl-5-thioxo-4,5-dihydro-1H-1,2,4-triazol-3-yl)methyl]-2,4- dihydro-3H-1,2,4-triazol-3-one (7). The reactions of compounds 5 and 7 with methyl iodide in the presence of sodium ethoxide afforded the corresponding N-methyl (6) and S-methyl (8) derivatives, respectively. The synthesis of Mannich bases (10a and 10b) was performed from the reaction of 7 with …
Synthesis And Characterization Of Novel Triazol Compounds Containing A Thiophen Ring As Potential Antifungal Agents And The Structure Of 2-(2-Hydroxy-2-P-Tolyethyl)-5-(Thiophen-2-Ylmethyl)- 4-(4h-1,2,4-Triazol-4-Yl)-2h-1,2,4-Triazol-3(4h)-One, Yasemi̇n Ünver, Esra Düğdü, Kemal Sancak, Mustafa Er, Reşat Ustabaş
Synthesis And Characterization Of Novel Triazol Compounds Containing A Thiophen Ring As Potential Antifungal Agents And The Structure Of 2-(2-Hydroxy-2-P-Tolyethyl)-5-(Thiophen-2-Ylmethyl)- 4-(4h-1,2,4-Triazol-4-Yl)-2h-1,2,4-Triazol-3(4h)-One, Yasemi̇n Ünver, Esra Düğdü, Kemal Sancak, Mustafa Er, Reşat Ustabaş
Turkish Journal of Chemistry
A series of new 4-(3,5-disubstitue-4H-1,2,4-triazol-4-yl)- 5-(thiophen-2-yl-methyl)-2H-1,2,4-triazol-3(4H)-ones (3a-c) were obtained by reaction N'-1-ethoxy-2-thiophen-2-yl-ethylydene hydrazino carboxylic acid ethyl ester (1) and 4-amino-4H-1,2,4-triazoles (2). 4-(3,5-disubstitue-4H-1,2,4-triazol-4-yl)-2-(2-oxo-2-arylethyl)-5- (thiophen-2-yl-methyl)-2H-1,2,4-triazol-3(4H)-ones (4a-e) and ethyl 2-(4-(3,5-disubstitue-4H-1,2,4-triazol-4-yl)-5-oxo-3-(thiophen-2-ylmethyl)- 4,5-dihydro-1,2,4-triazol-1-yl)acetates (6a-c) were obtained by reaction of compounds 3 and bromoacetophenon derivatives and bromo ethylacetate, respectively. Compounds 5a-e were synthesized from the reaction of corresponding compounds 4a-e with NaBH_4. Compounds 7a-c were obtained by the reaction compounds 6 and LiAlH_4. Seventeen new compounds were synthesized and characterized by elemental analyses, IR, ^1H-NMR, and ^{13}C-NMR spectral data. The structure of compound 5d was inferred through IR, ^1H-, ^{13}C-NMR, elemental analyses, and X-ray spectral techniques. …
Silica Supported Polyphosphoric Acid (Ppa-Sio_2): An Efficient And Reusable Heterogeneous Catalyst For The One-Pot Synthesis Of \Alpha -Amino Phosphonates, Malek Taher Maghsoodlou, Sayyed Mostafa Habibi-Khorassani, Reza Heydari, Nourollah Hazeri, Seyed Sajad Sajadikhah, Mohsen Rostamizadeh, Leila Keishams
Silica Supported Polyphosphoric Acid (Ppa-Sio_2): An Efficient And Reusable Heterogeneous Catalyst For The One-Pot Synthesis Of \Alpha -Amino Phosphonates, Malek Taher Maghsoodlou, Sayyed Mostafa Habibi-Khorassani, Reza Heydari, Nourollah Hazeri, Seyed Sajad Sajadikhah, Mohsen Rostamizadeh, Leila Keishams
Turkish Journal of Chemistry
An efficient green protocol is described for the preparation of \alpha -amino phosphonates, employing a one-pot three-component condensation reaction between aldehydes, amines, and trialkyl phosphites in the presence of PPA-SiO_2 under solvent-free conditions at 80 °C. The present procedure offer advantages such as high to excellent yields, short reaction time, inexpensiveness, recovery, and reusability of catalyst.
Synthesis And Spectroscopic Studies Of Some New Organometallic Chelates Derived From Bidentate Ligands, Kiran Singh, Parvesh Puri
Synthesis And Spectroscopic Studies Of Some New Organometallic Chelates Derived From Bidentate Ligands, Kiran Singh, Parvesh Puri
Turkish Journal of Chemistry
A series of organosilicon(IV) and organotin(IV) complexes having the formulae R_2MCl(L^1), R_2MCl(L^2), R_2MCl(L^3), R_2MCl(L^4), R_2M(L^1)_2, R_2M(L^2)_2, R_2M(L^3)_2, and R_2M(L^4)_2, where M = Si and Sn, and R = CH_3, were synthesized with Schiff bases 5-mercapto-4-(pyridine-2-carboxalideneamino)-s-triazole (HL^1), 4-(furfuralideneamino)-5mercapto-s-triazole (HL^2), 4-(2-chlorobenzylideneamino)-5-mercapto-s-triazole (HL^3), and 4-(4-flourobenzylideneamino)-5-mercapto-s-triazole (HL^4). These complexes were characterized by elemental analysis, molar conductance, and spectroscopic studies, including UV, IR, ^1H, ^{13}C, ^{29}Si, and ^{119}Sn NMR spectroscopy. On the basis of these studies, the resulting complexes are proposed to have trigonal bipyramidal and octahedral geometries.
A New Dinuclear Lead(Ii) Complex Of 2,3-Diphenyl-Tetrazole-5-Thione: Synthesis And Characterization, Ruirui Zhuang, Fangfang Jian, Kefei Wang
A New Dinuclear Lead(Ii) Complex Of 2,3-Diphenyl-Tetrazole-5-Thione: Synthesis And Characterization, Ruirui Zhuang, Fangfang Jian, Kefei Wang
Turkish Journal of Chemistry
The present work reports on the synthesis, crystal structure, fluorescence, electrochemical behavior, and thermogravimetric analysis of a new dinuclear lead(II) complex of 2,3-diphenyl-tetrazole-5-thione. Its structure was characterized by X-ray crystallography, IR spectroscopy, and elemental analysis. Each lead atom adopts a distorted octahedral geometry by coordinating to 2 sulfur atoms from 2 2,3-diphenyl-tetrazole-5-thione ligands and 4 oxygen atoms from 3 nitrates. The fluorescence spectrum shows that the title complex has 2 fluorescence emission peaks, at 412 nm and 433 nm. Cyclic voltammetry studies show that the title complex has only one reduction peak, at 0.309 V. The thermogravimetric analysis indicates that …
Preparation Of Polystyrene/Montmorillonite Nanocomposites: Optimization By Response Surface Methodology (Rsm), Sadik Erdem Yalçinkaya, Nuray Yildiz, Mehmet Saçak, Ayla Çalimli
Preparation Of Polystyrene/Montmorillonite Nanocomposites: Optimization By Response Surface Methodology (Rsm), Sadik Erdem Yalçinkaya, Nuray Yildiz, Mehmet Saçak, Ayla Çalimli
Turkish Journal of Chemistry
Preparation of polystyrene (PS)-montmorillonite nanocomposites was carried out in 3 steps: purification and determination of the cation exchange capacity (CEC) of clay, synthesis of organoclay, and preparation of nanocomposites. In organoclay synthesis, 3 types of surfactants, long-chained (cetyltrimethylammonium bromide (CTAB)), short-chained (tetraethylammonium bromide (TEAB)), and ringed (benzyltriethylammonium bromide (BTEAB)), were used. Gallery distances of pure clay and organoclays (CTAB-O, TEAB-O, and BTEAB-O) were determined by X-ray diffraction (XRD) analysis as 1.25, 2.09, 1.52, and 1.63 nm, respectively. Preparation of nanocomposites was carried out by in situ polymerization. Composites, containing 2%, 4%, and 6% organoclay by mass, were characterized by XRD, …
Synthesis And Characterisation Of Vanadium(Iii) Complexes Of Biphenylphenols, Neeraj Sharma, Maridula Thakur, S C. Chaudhry
Synthesis And Characterisation Of Vanadium(Iii) Complexes Of Biphenylphenols, Neeraj Sharma, Maridula Thakur, S C. Chaudhry
Turkish Journal of Chemistry
The vanadium(III) complexes of composition [VCl_{3-n}(OAr^{1,2})_n.(THF)_2] (OAr^1 = 2-phenylphenoxo and OAr^2 = 4-phenylphenoxo, THF = tetrahydrofuran; n = 1 /to 3) were prepared by in situ reaction of VCl_3.(THF)_3 with sodium salt of respective phenols in tetrahydrofuran. The complexes were characterised by elemental analysis, molar conductance, FTIR, UV-Vis, and FAB-mass spectral and magnetic studies. The thermal behaviour of some of the complexes was studied by TG-DTA. The dinuclear phenoxy bridged octahedral structures for the complexes were inferred from the spectral and magnetic studies.