Yılmaz-Savaşkan, Sevil | Özbayrak, Hulisi | Hazer, Baki

Article | 1997 | TURKISH JOURNAL OF CHEMISTRY21 ( 4 ) , pp.270 - 276

The crosslinked polystyrene-polycaprolactone, PS-PCL-, block copolymers were prepared by the copolymerization of styrene and poly(caprolacton dimethylmethacrylate) (PCL-DM). The molecular weights of polycaprolactone, PCL, PCL-DM were 1250 and 2000. The swelling in H2O or CHCl3 of the sulfonate and unsulfonated block copolymers were determined under comparable conditions and investigated. The capacities of the obtained ion exchange resins were 1.31 and 1.10 meq/g.

Sengul, A

Article | 2004 | TURKISH JOURNAL OF CHEMISTRY28 ( 5 ) , pp.667 - 672

The synthesis, characterization, and X-ray crystal structure of the yellow dimorph, [Pt(terpy)Cl]Cl(.)2H(2)O, are reported. The yellow acicular crystals are monoclinic: space group P2(1)/n, a = 6.908(3) Angstrom, b = 17.06700(11) Angstrom, c = 13.8390(10) Angstrom, beta = 98.607(4)degrees, and D-calc =2.204 Mg m(-3) for Z = 4. The cation consists of platinum coordinated to tridentate terpyridine ligand and to chloride ion. The coordination geometry is essentially square-planar with distortions arising from the constraints of the terpyridine ligand. Bond distances are within the acceptable limits of predicted values. The cations stac . . .k in a head-to-tail orientation with an intermolecular Pt-Pt distance of 3.39 Angstrom Daha fazlası Daha az

Agac, Caglar | Yilmaz, Ismail | Sengul, 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, C34H28N10 (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 angstrom). 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 mult . . .imodal 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, {[Cu3L2](PF6)3 center dot 3H(2)O} (1), as revealed by the ESI-MS, and further characterised by (1) H-NMR, UV-Vis, and FT-IR spectra Daha fazlası Daha az

Sengul, A

Article | 2005 | TURKISH JOURNAL OF CHEMISTRY29 ( 5 ) , pp.571 - 578

The title compound, C15H12N6O9Pt, consists of [Pt(terpy)ONO2](+) cation and [H(ONO2)(2)](-) anion, in which 2 nitrate groups are linked by a strong hydrogen bond [(OO)-O-... 2449(1) angstrom]. In the cation, the terpyridine is coordinated to Pt as a tridentate ligand and the fourth position is occupied by the nitrate ion's oxygen. The coordination around Pt is square-planar. The coordinated nitrate moiety adopts a distorted trigonal-planar configuration. It belongs to the space group P (1) over bar with a = 8.605(2), b = 10.220(3) angstrom, c = 10.517(2) angstrom and alpha = 89.51(1), beta = 82.78(2), gamma = 76.90(2)degrees.

Orhan, Ersin | Kose, Mahmut | Yazan, Tolga

Article | 2018 | TURKISH JOURNAL OF CHEMISTRY42 ( 4 ) , pp.1086 - 1094

Three new photochromic compounds, 3-(2,5-dimethyl-3-thienyl)-4-(2-phenyl-5-methyl-4-thiazolyl)-l,8-naphthalimide (1-O), 2,3-bis(2-phenyl-5-methyl-4-thiazolyl)-7H-benzimidazo[2,1-a]benzo[de]isoquinolin-7-one (2-O), and 2,5-dimethyl-3-thienyl)-7H-benzimidazo[2,1-a]benzo[de]isoquinolin-7-one (3-O), were synthesized and their photochromic properties were studied. Compound 1-O was synthesized by two consecutive Suzuki coupling reactions using 2,5-dimethylthiophene-3-boronic acid and 5-methyl-2-phenylthiazole-4-boronic acid. Photochromic compounds 2-O and 3-O were prepared by multistep reactions starting with 3-iodo-4-bromo-1,8-naphthalic . . . anhydride and 2,5-dimethylthiophene3-boronic acid or 2-phenyl-5-methylthiazole-4-boronic acid. All photochromic compounds showed a color change from colorless (or light yellow) to blue-green, purple, or orange colors (depending on the nature of the structures) on exposure to UV light at 365 nm in ethyl acetate solutions. The colored solutions can be reversed to the original colorless (or light yellow) solution by exposure to visible light at 530 nm Daha fazlası Daha az

Baran, Y | Baran, S | Tunali, NK

Article | 1997 | TURKISH JOURNAL OF CHEMISTRY21 ( 2 ) , pp.105 - 110

The syntheses, pK(a) 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 pK(a) values of the complexes were measured by spectrophotometric titration at 22 degrees C and mu = 0.100 M(NaClO4).

Mentes, Ayfer | Sezek, Seda | Hanhan, M. Emre | Buyukgungor, Orhan

Article | 2007 | TURKISH JOURNAL OF CHEMISTRY31 ( 6 ) , pp.667 - 676

Multidentate N-ligands (Schiff bases) were prepared by the condensation of 2-acetylpyridine or 2-benzoylpyridine, and 1,2-diaminoethane or 1,6-diaminohexane (2:1 ratio) in ethanol. These ligands were reacted with Mo(CO)(6) to obtain dinuclear metal tetracarbonyl compounds. Both terminal amine groups were seen to form imines from the reaction of mono-ketones with diamines in 2:1 or 1:1 ratios. The structures of these ligands and metal complexes were characterized by elemental analysis, and FT-IR, H-1-NMR, C-13-NMR, and LC-MS spectral techniques. N,N '-bis[1-(pyridin-2-yl)ethylidene]ethane-1,2-diamine, which was obtained by the reacti . . .on of 2-acetylpyridine and 1,2-diaminoethane, was also characterized by single crystal X-ray structure analysis. The crystal packing is stabilized by intermolecular H-bonding and p-p interactions Daha fazlası Daha az

Sengul, Abdurrahman | Agac, Hakan | Coban, Burak | Eroglu, Erol

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 C(2h) 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 N(4)-donor ligand to . . .coordinate to the metal centers via N atoms of the 2,2'-bipyridine and the imine moieties to afford tetrahedral complex [Cu(I)L]PF(6) (1), distorted octahedral complex [Cu(II)L(OH(2))(2)](NO(3))(2) (2), and square-planar complexes [Pt(II)L]Cl(2) (3) and [Pd(II)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, [Cu(2)L(2)](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 Daha fazlası Daha az

Sengul, A

Article | 2004 | TURKISH JOURNAL OF CHEMISTRY28 ( 6 ) , pp.703 - 713

2,2'-Bipyridyl-3,3'-dicaxboxylic acid (H2BDC) spontaneously resolves on crystallization from water, giving monohydrated crystals of the space group P2(1)2(1)2(1). 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 pK(a) values measured for H2BDC (3.18 +/- 0.04 and 4.59 +/- 0.02 at 20 +/- 1 degreesC, 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