Yazar "Koc, Ziya Erdem" seçeneğine göre listele

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    Complexes of Iron(III) and Chrom(III) Salen and Saloph Schiff Bases with Bridging 2,4,6-tris(4-nitrophenylimino-4'-formylphenoxy)-1,3,5-triazine
    (TAYLOR & FRANCIS INC, 2008) Koc, Ziya Erdem; Ucan, H. Ismet
    Four new trinuclear Fe(III) and Cr(III) complexes involving tetradenta Schiff bases N,N'-bis(salicylidene)ethylenediamine-(salenH2) or bis(salicylidene)-o-phenylenediamine-(saloph H2) with 2,4,6-tris(4-nitrophenylimino-4'-formylphenoxy)-1,3,5-triazine (TNPI-TRIPOD) have been synthesized and characterized by means of elemental analysis carrying out 1H-NMR., IR spectroscopy, thermal analyses and magnetic susceptibility measurements. The complexes can also be characterized as high-spin distorted octahedral Fe(III) and Cr(III) bridged by nitro. The nitro play a role as bridges for weak anti-ferromagnetic intramolecular exchange.
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    Complexes of Iron(III) and Chromium(III) Salen and Salophen Schiff Bases with Bridging 1,3,5-Triazine Derived Multidirectional Ligands
    (WILEY, 2011) Koc, Ziya Erdem
    A new synthetic route for preparing multidirectional ligands was developed by using 2,4,6-trichloro-1,3,5- triazine (cyanuric chloride) as core. The reaction included the selective substitutions of 4-aminobenzoic acid onto three chlorides of the triazine ring via a stepwise manner at 1:1, 1:2, or 1:3 equiv. and 0, 25, 130 degrees C, respectively. An efficient synthesis of a novel class of "multidirectional ligands'' has been developed based on high-yielding chloride substitutions of 2,4,6-trichloro-1,3,5-triazine by amines. Sixteen new mono-, di-, tri-, and tetra-nuclear Fe(III) and Cr(III) complexes involving tetradenta Schiff bases N,N'-bis(salicylidene)ethylenediamine-(salenH(2)) or bis(salicylidene)-o-phenylenediamine-(salophenH(2)) with two new 1,3,5-triazine derived multidirectional ligands were synthesized and characterized by means of elemental analysis, H-1 NMR, FT-IR spectroscopy, LC-MS analysis, AAS, thermal analysis, and magnetic susceptibility measurements. The complexes were also characterized as low-spin distorted octahedral Fe(III) and Cr(III) bridged by carboxylic acids. It was understood that the [{Fe(salen)/(salophen)}(2)O] and [{Cr(salen)/(salophen)}(2)O] containing compounds could be represented by the electronic structure of t(2g)(6)e(g)(0) and t(2g)(3)e(g)(0).
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    Complexes of iron(III) salen and saloph Schiff bases with bridging 2,4,6-tris(2,5dicarboxyphenylimino-4-formylphenoxy)-1,3,5-triazine and 2,4,6-tris(4-carboxyphenylimino-4'-formylphenoxy)-1,3,5-triazine
    (SPRINGER, 2007) Koc, Ziya Erdem; Ucan, H. Ismet
    Four new trinuclear Fe(III) complexes involving tetradenta Schiff bases N,N-1 -bis(salicylidene) ethylenediamine-(salenH(2)) or bis(salicylidene)-o-phenylenediamine-(salophH(2)) with 2,4,6-tris(2,5-dicarboxyphenylimino-4-formylphenoxy)-1,3,5-triazine (DCPI-TRIPOD) or 2,4,6-tris(4-carboxyphenylimino-4'-formylphenoxy)-1,3,5-triazine (CPI-TRIPOD) have been synthesized and characterized by means of elemental analysis carrying out H-1-n.m.r., i.r. spectroscopy, thermal analyses and magnetic susceptibility measurements. The complexes can also be characterized as high-spin distorted octahedral Fe-III bridged by carboxylic acids. The tricarboxylic acids play a role as bridges for weak antiferromagnetic intramolecular exchange.
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    Investigation of Dipodal oxy-Schiff base and its salen and salophen Fe(III)/Cr(III)/Mn(III) Schiff bases (N2O2) caped complexes and their magnetic and thermal behaviors
    (ELSEVIER, 2014) Celikbilek, Seyma; Koc, Ziya Erdem
    Six new dinuclear Fe(III)/Cr(III)/Mn(III) complexes have been involved tetradentate (N2O2) Schiff bases (salenH(2)) and (salophenH(2)) with 2,4-bis(4-hydroxyphenylimino-4'-formylphenoxy)-6-methoxy-1,3, 5-triazine have been synthesized. The complexes were characterized as high-spin (S = 5/2) distorted trigonal bipyramidal salen/salophenFe(III) bridged, distorted trigonal bipyramidal (S = 3/2) salen/salophenCr(III) and high-spin distorted trigonal bipyramidal (S = 2) salen/salophenMn(III) by OH- groups. The structures of ligand and complexes were identified by using elemental analysis, thermal analysis, magnetic susceptibility, LC-MS, ICP-AES, H-1 NMR and FT-IR spectral data. (C) 2014 Elsevier B.V. All rights reserved.
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    Investigation of novel monopodal and dipodal oxy-Schiff base triazine from cyanuric chloride: Structural and antimicrobial studies
    (TAYLOR & FRANCIS INC, 2016) Koc, Ziya Erdem; Uysal, Ahmet
    During the last few years, the potential of s-triazine derivatives in agrochemical and medicinal properties have been subjected to investigation. s-Triazine derivatives have received great attention due to their significant antimicrobial, antibacterial, antifungal, anti-HIV, anticancer, and a wide array of other biological activities. The present study reported a method for achieving Dipodal systems formed by reaction 2,4,6-trichloro-1,3,5-triazine and 4-hydroxybenzaldehyde, 2-aminophenol. Herein, we reported the synthesis of a dialdehyde and its Schiff base as a new template. The reaction of cyanuric chloride with 1 equiv. methanol and 2 equiv. of p-hydroxybenzaldehyde gave the desired dialdehyde. The dialdehyde was then reacted with 2-aminophenolto afford the corresponding multidirectional oxy-Schiff base triazines. The structures of the compounds were identified by FT-IR,H-1-NMR and elemental analysis. Their antimicrobial activities were performed by using the broth microdilution method in DMSO: Phosphate Buffered Saline (PBS) against eight bacteria strain and one yeast strain. The results of the test were compared with gentamicin. It has been determined that 2,4-Bis(2-hydroxyphenylimino-4'-formylphenoxy)-6-methoxy-1,3,5-triazine (3) (2DP2AF) and 2-(2-hydroxyphenylimino-4'-formylphenoxy)-4-(4'-formylphenoxy)-6-methoxy-1,3,5-triazine (2) (1DP2AF) have significant antibacterial and antifungal activity against Enterococcus faecalis and Candida albicans and these effects were close to the control antibiotic used. Ent. faecalis was the most sensitive strain against both two tested chemicals. It was determined that our chemicals have similar antifungal capacity when compared to gentamicin.
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    THE INVESTIGATION OF SECOND-ORDER NONLINEAR OPTICAL PROPERTIES OF P-NITROPHENYLAZOANILINE: SECOND HARMONIC GENERATION AND AB INITIO COMPUTATIONS
    (WORLD SCIENTIFIC PUBL CO PTE LTD, 2012) Karakas, Asli; Koc, Ziya Erdem; Fridrichova, Michaela; Nemec, Petr; Kroupa, Jan
    p-nitrophenylazoaniline (1) belongs to the family of compounds with conjugated bonds and delocalized pi-electrons, structurally similar to the well known push-pull compound Disperse Red 1 (DR1).(1) Due to the assembly of the molecule, nonlinear optical (NLO) properties are expectable and can be more or less accurately predicted. To estimate the potential for second-order NLO properties, the electric dipole moment (mu), dispersion-free dipole polarizabilities (alpha) and first hyperpolarizabilities (beta) have been determined by density functional theory (DFT) quantum chemical calculations at B3LYP/6-311+G(d,p) level. According to the computation results, the synthesized compound exhibits non-zero beta values and it might have second-order NLO behavior. Title compound has been synthesized and characterized by FT-IR, H-1-NMR and UV-Vis spectroscopies. The maximum one-photon absorption (OPA) wavelengths were estimated to be shorter than 450nm by quantum mechanical computations using the configuration interaction (CI) method. The same result was achieved by UV-Vis spectra measurements, whereas the compound exhibited good optical transparency to the visible light. Quantitative measurements of second harmonic generation (SHG) at 800nm and 1064nm have been performed. The relative efficiency comparable with that of KDP (kalium diphosphate) has been observed with the exciting wavelength of 1064 nm, while the other wavelength led to strong absorption of produced light by the sample. In the following more detailed study on frequency-dependent first hyperpolarizabilities using time-dependent Hartree-Fock (TDHF) method have been computed at the wavelengths used in SHG measurements.
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    A symmetric and selective fluorescent Cu (II) sensor based on bodipy and s-triazine
    (ELSEVIER SCIENCE BV, 2014) Kursunlu, Ahmed Nuri; Koc, Ziya Erdem; Obali, Aslihan Yilmaz; Guler, Ersin
    A symmetric fluorescent sensor based on Bodipy for Cu (II) ion was designed according to binding site-signaling subunit approach. This sensor was prepared by reaction of 2,4-diamino-6-methyl-1,3,5-triazine with a 8-{4-(chloromethyl)phenyl}-2,6-diethyl-4,4-difluoro-1,3,5,7-tetramethyl-4-bora-3a,4a-diaza-s-indacene in dimethyl formamide. The synthesis and the photophysical properties of Bodipy-triazine derivative were investigated in presence of some metal ion. The results show that this symmetrical fluorescent sensor has a high selectivity for Cu (II) ion. Published by Elsevier B.V.
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    The synthesis and characterization of (MSalen/salophen/saldeta/salpy) [M=Fe(III) or Cr(III)] capped heteromultinuclear schiff bases-dioxime Ni(II) complexes: Their thermal and magnetic behaviours
    (ELSEVIER SCIENCE BV, 2018) Uysal, Saban; Koc, Ziya Erdem
    Chlorophenylglyoxime and Ligand Complexes ([M(Salen/Salophen)](2)O, [M(Saldeta/Salpy)Cl] shortened as LC, M = Fe(III) or Cr(III)) have been synthesized. 3,5-dicarboxyanilinophenylglyoxime (5) and 4-carboxyphenylhydrazinophenylglyoxime (6) have been synthesized with the reaction of chlorophenylglyoxime and 5-aminoisophtalalic acid or 4-hydrazinobenzoic acid. [M(Salen/Salophen/Saldeta/ Salpy)-3,5-dicarboxyanilinophenyl-glyoxime)] (7-14) or [M(Salen/Salophen)-4-carboxyphenylhydrazinophenylglyoxime)] (15-22) have been synthesized from (5) or (6) and LCs. The new heterotrinuclear and pentanuclear complexes (23-38) have been obtained from (7-22) and Ni(II) salt. Then, heteronuclear and BF2+ capped vic-dioxime complexes (39-54) have been synthesized. The complexes have been characterized as low-spin (S=1/2) distorted octahedral [Fe-III(Salen/Salophen)], high-spin (S = 5/2) distorted octahedral [Fe-III(Saldeta/Salpy)] and (S = 3/2) distorted octahedral [Cr-III(Salen/Salophen/Saldeta/Salpy)] bridged by COO- groups. The structure of all ligand and complexes were identified by using elemental analysis, thermal analyses, magnetic susceptibility, LC-MS, ICP-AES, H-1-NMR and FT-IR spectral data. (C) 2018 Elsevier B.V. All rights reserved.
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    Synthesis and characterization of a new dioxime and its heterotrinuclear BF(2)(+) capped complexes
    (TAYLOR & FRANCIS INC, 2008) Uysal, Saban; Coskun, Ahmet; Koc, Ziya Erdem; Ucan, H. Ismet
    omega-Isonitrosoacetophenone (1), phenylglyoxime (2), chlorophenylglyoxime (1), dopaminophenylglyoxime (3) and [(salen/saloph)Fe](2)O (4) have been synthesized as described in the literature procedure. [Fe(III)(salen/saloph)dopaminophenylglyoxime)] (starting complexes) have been synthesized from dopaminophenylglyoxime and tetradentate schiff bases which contain dinuclear Fe(III) oxygen-bridges N,N'-bis(salicylidene)ethylenediamine (salenH(2)) and bis(salicylidene)-o-phenylenediamine (salophH(2)). The new heterotrinuclear complexes have been obtained from starting complexes and Co(II), Ni(II), Cu(II) salts. Then, heterotrinuclear vic-dioxime complexes containing BF(2)(+) capped have been synthesized. The complexes have been characterized as low-spin distorted octahedral Fe(III) bridged by o-hydroxyphenolic groups. The o-hydroxyphenolic groups play a role as bridges for weak antiferromagnetic intramolecular exchange. The structure of dioxime and its complexes were identified by using elemental analysis, ICP-AES, (1)H-NMR and IR spectral data.
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    Synthesis and characterization of dopamine substitue tripodal trinuclear [(salen/salophen/salpropen)M] (M=Cr(III), Mn(III), Fe(III) ions) capped s-triazine complexes: Investigation of their thermal and magnetic properties
    (ELSEVIER SCIENCE BV, 2016) Uysal, Saban; Koc, Ziya Erdem
    In this work, we aimed to synthesize and characterize a novel tridirectional ligand including three catechol groups and its novel tridirectional-trinuclear triazine core complexes. For this purpose, we used melamine (2,4,6-triamino-1,3,5-triazine) (MA) as starting material. 2,4,6-tris(4-carboxybenzimino)-1,3,5-triazine (II) was synthesized by the reaction of an equivalent melamine (I) and three equivalent 4-carboxybenzaldehyde. 4,4',4 ''-((1E,1'E,1 '' E)-((1,3,5-triazine-2,4,6-triyl)tris(azanylylidene))tris(methanylylidene))tris(N-(3,4-dihydroxyphenethyl)benzamide) L (IV) was synthesized by the reaction of one equivalent (II) and three equivalent dopamine (3,4-dihydroxyphenethylamine) (DA) by using two different methods. (II, III, IV) and nine novel trinuclear Cr(III), Mn(III) and Fe(III) complexes of (IV) were characterized by means of elemental analyses, H-1 NMR, FT-IR spectrometry, LC-MS (ESI+) and thermal analyses. The metal ratios of the prepared complexes were performed using Atomic Absorption Spectrophotometry (AAS). We also synthesized novel tridirectional-trinuclear systems and investigated their effects on magnetic behaviors of [salen, salophen, salpropen Cr(III)/Mn(III)/Fe(III)] capped complexes. The complexes were determined to be low-spin distorted octahedral Mn(III) and Fe(III), and distorted octahedral Cr(III) all bridged by catechol group. (C) 2015 Elsevier B.V. All rights reserved.
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    Synthesis and Characterization of Tripodal Oxy-Schiff base (2,4,6-Tris(4-Carboxymethylenephenylimino-4 '-formylphenoxy)-1,3,5-triazine) and the Thermal and Magnetic Properties of its Fe(III)/Cr(III) Complexes
    (SPRINGER, 2011) Koc, Ziya Erdem; Uysal, Saban
    Eight new trinuclear Fe(III)/Cr(III) complexes involving tetradentate (N2O2) and pentadentate (N3O2) Schiff bases of (salenH(2)), (salophenH(2)), (saldetaH(2)) and (salpyrH(2)) with 2,4,6-tris(4-carboxymethylenephenylimino-4'-formylphenoxy)-1,3,5-triazine were synthesized. The structure of ligand and complexes were identified using elemental and thermal analysis, magnetic susceptibility, and LC-MS, ICP-AES, H-1 NMR and FT-IR spectral data. All complexes are tripodal-trinuclear. The complexes are low-spin (S = 1/2) distorted octahedral salen- or salophen-capped Fe(III), high-spin (S = 5/2) distorted octahedral saldeta- or salpyr-capped Fe(III) and distorted octahedral (S = 3/2) salen-, salophen-, saldeta- or salpyr-capped Cr(III).
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    Synthesis of benzimidazole Schiff base derivatives and cytotoxic effects on colon and cervix cancer cell lines
    (BIOINTERFACE RESEARCH APPLIED CHEMISTRY, 2017) Arslaner, Cennet; Karakurt, Serdar; Koc, Ziya Erdem
    During the last few years the potential of benzimidazole derivatives in agrochemical and medicinal properties have been subjected to investigation. benzimidazole derivatives have been received central attention due to their significant antimicrobial, antibacterial, antifungal, anti-HIV, anticancer, and a wide array of other biological activities. The formation of 2-aryl-substituted benzimidazoles, by the polyphosphoric acid-catalyzed condensation of a carboxylic acid, with an o-amino-arylamine is described. The condensations proceed in good yield to give products which, in certain instances, are not readily attainable by conventional condensation techniques. The study of Benzimidazole containing Schiff bases is also of interest as some of them have shown the ability to anticancer. The structures of the compounds were identified by FT-IR, H-1 NMR, C-13 NMR and elemental analysis. Cytotoxic effects of benzimidazole derivatives on human cervical and colon cancer cell lines HeLa and SW-620 was determined spectrophotometrically by using Alamar Blue. Benzimidazole derivatives selectively inhibited proliferation of cancerous cell lines. None of the benzimidazole Schiff base derivatives inhibits proliferation of SW-620 while 4-APbzlH, 4SAPbz1H and 3SAPbz1H dose dependently inhibit proliferation of HeLa cells with IC50 of 230 mu M, 110.6 mu M and 101.3 mu M, respectively.
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    SYNTHESIS OF STAR-SHAPED MACROMOLECULAR SCHIFF BASE COMPLEXES HAVING MELAMINE CORES AND THEIR MAGNETIC AND THERMAL BEHAVIORS
    (TAYLOR & FRANCIS INC, 2012) Uysal, Saban; Koc, Ziya Erdem; Celikbilek, Seyma; Ucan, H. Ismet
    We aim to study magnetic and thermal behaviors of some melamine cored macromolecular Schiff base complexes. In this context, tripodal ligands were synthesized by reacting melamine with 4-carboxybenzaldehyde or 4-hydroxybenzaldehyde. Then, 16 new trinuclear Fe(III), Cr(III), Mn(III), and Al(III) complexes were synthesized by reacting the ligands [ tris-(4-carboxybenzimino)-1,3,5-triazine) or tris-(4-hydroxybenzimino)-1,3, 5-triazine)] with pentadentate Schiff bases N,N'-bis(1-hydroxy-2-benzyliden)-1,7diamino-4-azaheptane or N,N'-bis(salicylidene) pyridine-2,6-diamine. Later, ligands and complexes were characterized by means of elemental analysis, infrared spectroscopy, H-1 NMR, liquid chromatography-mass spectrometry, thermal analyses, and magnetic susceptibility measurements. Finally, metal ratios of the prepared complexes were determined by using atomic adsorption spectrometry. The complexes were also characterized as distorted octahedral high-spin d(3) (S = 3 x 1/2) Cr(III), high-spin d(5) (S = 5 x 1/2) Fe(III), low-spin d(4) (S = 2 x 1/2) Mn(III), and diamagnetic Al(III) bridged by -OH group of COO- or OH group of phenol.