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Filtreler
Synthesis and crystal structure of a novel multimodal ligand, 6, 6'-bis(2-(di(pyridin-2-yl)methylene)-1- methylhydrazinyl)-2, 2'-bipyridine, and its copper(I) complex, {[Cu3L2](PF6) 3• 3H2O} (1)

Agaç C. | Yilmaz I. | Şengül A. | Coles S.J.

Article | 2010 | Turkish Journal of Chemistry34 ( 5 ) , pp.781 - 791

The single crystal X-ray structure of the novel multimodal ligand 6, 6'-bis(2-(di(pyridin-2-yl)methylene)- 1-methylhydrazinyl)-2, 2'-bipyridine, C34 H28N10 (L), was determined at 120 (2) K. The ligand possesses a centre of symmetry that generates a planar bipyridyl core with the hydrazone substituents in a trans- geometry. The di-2-pyridyl moieties at either terminus of the molecule twist out of the plane (52.90 and 56.32 A). The crystal structure comprises 2-dimensional ribbons that stack about each other so as to optimise van der Waals interactions and packing efficiency. Studies of the coordination properties of the novel multimo . . .dal ligand with copper(I) show that 2 ligand strands wrapped around the copper(I) having a preference for tetrahedral geometry to furnish a supramolecular self-assembled of a double-stranded tri-nuclear helical complex, {[Cu3L 2](PF6)3-3H2O} (1), as revealed by the ESI-MS, and further characterised by 1H-NMR, UV-Vis, and FT-IR spectra. © TÜBITAK Daha fazlası Daha az

Synthesis and crystal structure of a novel multimodal ligand, 6,6’-bis(2-(di(pyridin-2-yl)methylene)-1- methylhydrazinyl)-2,2’-bipyridine, and its copper(I) complex, ${[Cu_ 3L_ 2](PF_ 6)_ 3.3H_ 2O}$

Ağac, Çağlar | Yılmaz, İsmail | Şengül, Abdurrahman | Coles, Simon James

Article | 2010 | Turkish Journal of Chemistry34 ( 5 ) , pp.781 - 791

The single crystal X-ray structure of the novel multimodal ligand 6,6’-bis(2-(di(pyridin-2-yl)methylene)- 1-methylhydrazinyl)-2,2’-bipyridine, $C _{34}H _{28}N _{10}$ (L), was determined at 120 (2) K. The ligand possesses a centre of symmetry that generates a planar bipyridyl core with the hydrazone substituents in a transgeometry. The di-2-pyridyl moieties at either terminus of the molecule twist out of the plane (52.90 and 56.32 ˚A). The crystal structure comprises 2-dimensional ribbons that stack about each other so as to optimise van der Waals interactions and packing efficiency. Studies of the coord . . .ination properties of the novel multimodal ligand with copper(I) show that 2 ligand strands wrapped around the copper(I) having a preference for tetrahedral geometry to furnish a supramolecular self-assembled of a double-stranded tri-nuclear helical complex, ${[Cu_ 3L_ 2](PF_ 6)_ 3.3H_ 2O}$ (1), as revealed by the ESI-MS, and further characterised by $^ 1 H$-NMR, UV-Vis, and FT-IR spectra. The single crystal X-ray structure of the novel multimodal ligand 6,6’-bis(2-(di(pyridin-2-yl)methylene)- 1-methylhydrazinyl)-2,2’-bipyridine, $C _{34}H _{28}N _{10}$ (L), was determined at 120 (2) K. The ligand possesses a centre of symmetry that generates a planar bipyridyl core with the hydrazone substituents in a transgeometry. The di-2-pyridyl moieties at either terminus of the molecule twist out of the plane (52.90 and 56.32 ˚A). The crystal structure comprises 2-dimensional ribbons that stack about each other so as to optimise van der Waals interactions and packing efficiency. Studies of the coordination properties of the novel multimodal ligand with copper(I) show that 2 ligand strands wrapped around the copper(I) having a preference for tetrahedral geometry to furnish a supramolecular self-assembled of a double-stranded tri-nuclear helical complex, ${[Cu_ 3L_ 2](PF_ 6)_ 3.3H_ 2O}$ (1), as revealed by the ESI-MS, and further characterised by $^ 1 H$-NMR, UV-Vis, and FT-IR spectra Daha fazlası Daha az

Dinuclear molybdenum tetracarbonyl complexes of tetradentate nitrogen ligands and intermolecular hydrogen bonding in the crystal structure of N,N'-bis-(1-(pyridin-2-yl) ethylidene)-ethane-1,2-diamine

Menteş, Ayfer | Sezek, Seda | Hanhan, M. Emre | Büyükgüngör, Orhan

Article | 2007 | Turkish Journal of Chemistry31 ( 6 ) , pp.667 - 676

http://www.trdizin.gov.tr/publication/paper/detail/TmprMk1qazU= https://hdl.handle.net/20.500.12628/414

Structural studies of complex compounds of 6,6'-diacetyl-2,2'-bipyridine dioxime with copper(I/II), platinum(II), and palladium(II) metal ions

Sengul A. | Agaç H. | Çoban B. | Eroglu E.

Article | 2011 | Turkish Journal of Chemistry35 ( 1 ) , pp.25 - 36

The tetradentate ligand 6,6'-diacetyl-2,2'-bipyridine dioxime (L) was obtained in high yield by the condensation reaction of 6,6'-diacetyl-2,2'- bipyridine with hydroxyl amine in alkaline solution. Density functional calculations and 3D modeling of the structure at the B3LYP/6-31G(d) level of theory for L revealed that the energy difference between the global trans conformer (trans-L), which possesses the C2h point group, and the distorted cis conformer (cis-L) was 5.214 kcal/mol. Synthesis and characterization of the metal complexes with Cu(I), Cu(II), Pt(II), and Pd(II) metal ions were reported. L acted as a N4- donor ligand to co . . .ordinate to the metal centers via N atoms of the 2,2'-bipyridine and the imine moieties to afford tetrahedral complex [CuI L]PF6 (1), distorted octahedral complex [CuII L(OH2)2](NO 3)2 (2), and square-planar complexes [PtII L]Cl2 (3) and [PdII L]Cl (4), respectively. The CHN analysis for 1 implies that L coordinated to 2 copper(I) ions as a bridging ligand to form a dinuclear metal complex, [Cu2L2] 2+, due to the twisting of the coordinated bonds exposed by the tetrahedral geometry preference for the metal ion. The ligand formed intramolecular hydrogen bonds between the oxime groups in 4, as revealed by the spectroscopic studies. The most stable conformations of the compounds were obtained by using the molecular mechanics optimization feature in CAChe software with an augmented MM2 force field. 1. © 2011 Tübïtak Daha fazlası Daha az

Radio frequency-induced plasma polymerization of allyl alcohol and 1-propanol

Candan Ş.

Article | 2002 | Turkish Journal of Chemistry26 ( 5 ) , pp.783 - 791

The effect of the composite parameters' plasma power (P)-to-monomer flow rate (ø) ratio (P/ø) in the plasma polymerization of allyl alcohol and 1-propanol was studied. The radio-frequency plasmas of deposits operated at low power (1-15 W) were investigated using deposition rate measurements. Detailed chemical information on the plasma polymers was obtained by X-ray photoelectron spectroscopy (XPS). The study of the surface chemistry of films created from allyl alcohol and 1-propanol demonstrates the importance of the double bond for good C-O group retention. The deposition rates of both plasma polymers were found to increase with in . . .creasing P. The comparison of the deposition rates of plasma-deposited allyl alcohol and 1-propanol suggests that the double bond is involved in the deposition mechanism Daha fazlası Daha az

Comparison of photochromic properties and thermal stabilities of fulgide, fulgimide, and benzimidazole[1,2-a]pyrrolidine-2-one derivatives

Köse M. | Orhan E.

Article | 2009 | Turkish Journal of Chemistry33 ( 5 ) , pp.579 - 588

New thermally stable photochromic fulgimides and benzimidazole[1,2-a]pyrrolidin-2-one derivatives of furylfulgide and thienylfulgide were prepared and their photochromic properties were investigated. Thermal stabilities of some of the new isomers in an alcoholic solution and in PMMA (poly(methyl methacrylate)) polymer films, and pyrolytic behaviors in inert atmosphere with TGA were compared. The colored form of fulgimide and that of benzimidazole[1,2-a]pyrrolidin-2-one derivatives showed large bathochromic shifts for visible absorption maximum compared with the colored form of corresponding fulgides. The imides and benzimidazole[1,2 . . .-a]pyrrolidin-2-one derivatives of fulgide displayed better thermal stability than corresponding fulgides. © TÜBİTAK Daha fazlası Daha az

Spectrophotometric determination of the pKa values of some aminoacid complexes of pentacyanoferrate(II) and pentacyanoruthenate(II)

Baran Y. | Baran S. | Tunali N.K.

Article | 1997 | Turkish Journal of Chemistry21 ( 2 ) , pp.105 - 110

The syntheses, pKa and spectrospcopic characterization of [Fe(CN)5(H2O)]-3 and [Ru(CN)5(H2O)]-3 complexes of alanine(Ala), glycine(Gly), valine(Val), lysine(Lys), arginine(Arg) and cysteine(Cys) complexes were investigated in aqueous solution. The spectra of the complexes containing amino acid ligands were similar to that of [Fe(CN)5(NH3)]-3. The pKa values of the complexes were measured by spectrophotometric titration at 22°C and µ = 0.100 M(NaClO4).

An atropisomeric chiral 2,2'-bipyridyl-3,3'-dicarboxylic acid and corresponding platinum(II) complex

Şengül A.

Article | 2004 | Turkish Journal of Chemistry28 ( 6 ) , pp.703 - 713

2,2'-Bipyridyl-3,3'-dicarboxylic acid (H2BDC) spontaneously resolves on crystallization from water, giving monohydrated crystals of the space group P212121. In any individual crystal, all the atropisomeric-skewed molecules are of one hand; however, on dissolution in water, optical activity is lost. Strong hydrogen bonding leads to a helical structure, via O-H?N links, and 3 further strong bonds between water and carboxylate groups produce a framework structure. The pKa values measured for H2BDC (3.18 ± 0.04 and 4.59 ± 0.02 at 20 ± 1°C, in dilute aqueous solution) agree with the zwitterionic form. The reaction of H2BDC with potassium . . . tetrachloroplatinate(II) in water gives Pt(H2BDC)Cl 2·H2O. The complex was characterized by elemental analysis and spectroscopic techniques Daha fazlası Daha az

Synthesis and characterization of novel polyamide and polyhydrazides based on the 6,6'-disubstituted-2,2'-bipyridine

Şengül, Abdurrahman | Arslan, Hülya

Article | 2008 | Turkish Journal of Chemistry32 ( 3 ) , pp.355 - 364

The monomers namely 6,6'-dicarbonylchloride-2,2'-bipyridine (1) and 6,6'-dihydrazme-2,2'-bipyridme (2) were synthesized and characterized thoroughly. The polyhydrazides (PHZ1 and PHZ2) were obtained by direct polycondensation of 2 with terephtaloylchloride (TPC1), and novel polyamide (PA1) by direct polycondensation of 1 with hexametyhlenediamine (HMDA). Polymers with low PDIs were generated in all cases (PD ~ 1.02-1.3). The polymers were characterized by $^1H$ and $^{13}C$ NMR, FT-IR, and Gel Permission Chromatography (GPC). The monomers namely 6,6'-dicarbonylchloride-2,2'-bipyridine (1) and 6,6'-dihydrazme-2,2'-bipyridme (2) were . . .synthesized and characterized thoroughly. The polyhydrazides (PHZ1 and PHZ2) were obtained by direct polycondensation of 2 with terephtaloylchloride (TPC1), and novel polyamide (PA1) by direct polycondensation of 1 with hexametyhlenediamine (HMDA). Polymers with low PDIs were generated in all cases (PD ~ 1.02-1.3). The polymers were characterized by $^1H$ and $^{13}C$ NMR, FT-IR, and Gel Permission Chromatography (GPC) Daha fazlası Daha az

2019-12-23

Şengül, Abdurrahman

Article | 2005 | Turkish Journal of Chemistry29 ( 5 ) , pp.571 - 578

http://www.trdizin.gov.tr/publication/paper/detail/TkRrd05qWTI= https://hdl.handle.net/20.500.12628/1601

Base hydrolysis kinetics of cobalt(III) spiro-octaamine dimer

Baran Y. | Lawrance G.

Article | 2002 | Turkish Journal of Chemistry26 ( 5 ) , pp.771 - 776

The preparation and characterisation of a cobalt (III) complex of octaaza ligand, 5, 5'-bis(4-amino-2-azabutyl)-1,9-diamino-3,7-diazanonane (octaam) is described. The base hydrolysis kinetics of bis cobalt(III) of octaam has been studied spectrophotometrically by the stopped-flow technique. A consequent reaction is observed in the base hydrolysis of the spiro-octaamine with the fast reaction having kOH = 3.55 M-1s-1 and the slower reaction kOH = 0.72 M-1s-1 at 298 K with ?H# = 89 kJ/mol for the fast stage and ?H# = 102 kJ/mol for the slow stage (I = 0.4 M NaClO4). The fast reaction is assigned to the hydrolysis of the trans diaqua a . . .nd the slower to further hydrolysis of the remaining Cl ions. The reaction appears to proceed predominantly by a DCB (dissociative conjugate base) mechanism Daha fazlası Daha az

Synthesis and characterization of novel polyamide and polyhydrazides based on the 6,6'-disubstituted-2,2'-bipyridine

Şengül A. | Arslan H.

Article | 2008 | Turkish Journal of Chemistry32 ( 3 ) , pp.355 - 364

The monomers namely 6,6'-dicarbonylchloride-2,2'-bipyridine (1) and 6,6'-dihydrazine-2,2'-bipyridine (2) were synthesized and characterized thoroughly. The polyhydrazides (PHZ1 and PHZ2) were obtained by direct polycondensation of 2 with terephtaloylchloride (TPCl), and novel polyamide (PA1) by direct polycondensation of 1 with hexametyhlenediamine (HMDA). Polymers with low PDIs were generated in all cases (PD ~ 1.02-1.3). The polymers were characterized by 1H and 13C NMR, FT-IR, and Gel Permission Chromatography (GPC). © TÜBİTAK.

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