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Öğe 4-[(2E)-2-(4-Chlorobenzylidene)hydrazinylidene]-1-methyl-1,4-dihydropyridine monohydrate(Wiley-Blackwell, 2010) Aydin, Abdullah; Akkurt, Mehmet; Alptuzun, Vildan; Buyukgungor, Orhan; Holzgrabe, Ulrike; Radacki, KrzysztofIn the title compound, C(13)H(12)ClN(3)center dot H(2)O, the organic molecule is almost planar, with a dihedral angle of 3.22 (10)degrees between the benzene and pyridine rings. The crystal structure is stabilized by O-H center dot center dot center dot N and C-H center dot center dot center dot O hydrogen bonding and pi-pi stacking interactions [centroid-centroid distances = 3.630 (1) and 3.701 (1) angstrom].Öğe Bis{mu-2,4-di-tert-butyl-6-[3-(1H-imidazol-1-yl)propyliminomethyl]-phenolato}bis[acetatocopper(II)](Wiley-Blackwell, 2008) Sahin, Onur; Buyukgungor, Orhan; Ulusoy, Mahmut; Cetinkaya, BekirÖğe Crystal structure and theoretical study of N,N-bis[(5-chloro-2-oxo-2,3-dihydrobenzo[d]-oxazol-3-yl)methyl]-2-phenylethanamine(Int Union Crystallography, 2018) Aydin, Abdullah; Soyer, Zeynep; Akkurt, Mehmet; Buyukgungor, OrhanIn the molecular structure of the title compound, C24H19Cl2N3O4, the three C atoms of the central N, N-dimethylmethanamine moiety are bonded to the N atoms of the two 5-chloro-1,3-benzoxazol-2(3H)-one groups and to the methyl C atom of the methylbenzene group. One of the nine-membered 2,3-dihydro-1,3-benzoxazole rings and the phenyl ring are almost parallel to each other, making a dihedral angle of 5.30 (18)degrees, but they are almost normal to the mean plane of the other nine-membered 2,3-dihydro-1,3-benzoxazole ring, subtending dihedral angles of 89.29 (16) and 85.41 (18)degrees, respectively. The crystal structure features C-H center dot center dot center dot O hydrogen bonds and pi-pi stacking interactions [centroid-to-centroid distances = 3.5788 (19) angstrom, slippage = 0.438 and 3.7773 (16) angstrom, and slippage = 0.716 angstrom].Öğe Di- and polynuclear silver(I) saccharinate complexes of tertiary diphosphane ligands: synthesis, structures, in vitro DNA binding, and antibacterial and anticancer properties(Springer, 2014) Yilmaz, Veysel T.; Gocmen, Elif; Icsel, Ceyda; Cengiz, Murat; Susluer, Sunde Y.; Buyukgungor, OrhanA series of new silver(I) saccharinate (sac) complexes, [Ag-2(sac)(2)(mu-dppm)H2O]center dot H2O (1), {[Ag-2(mu-sac)(2)(mu-dppe)]center dot 3H(2)O center dot CH2Cl2} (n) (2), [Ag-2(mu-sac)(2)(mu-dppp)] (n) (3), and [Ag(sac)(mu-dppb)] (n) (4) [dppm is 1,1-bis(diphenylphosphino)methane, dppe is 1,2-bis(diphenylphosphino)ethane, dppp is 1,3-bis(diphenylphosphino)propane, and dppb is 1,4-bis(diphenylphosphino)butane], have been synthesized and characterized by C, H, N elemental analysis, IR spectroscopy, H-1 NMR, C-13 NMR, and P-31 NMR spectroscopy, electrospray ionization mass spectrometry, and thermogravimetry-differential thermal analysis. Single-crystal X-ray studies show that the diphosphanes act as bridging ligands to yield a dinuclear complex (1) and one-dimensional coordination polymers (2 and 4), whereas the sac ligand adopts a mu(2)-N/O bridging mode in 2, and is N-coordinated in 1 and 4. The interaction of the silver(I) complexes with fish sperm DNA was investigated using UV-vis spectroscopy, fluorescence spectroscopy, and agarose gel electrophoresis. The binding studies indicate that the silver(I) complexes can interact with fish sperm DNA through intercalation, and complexes 1 and 3 have the highest binding affinity. The gel electrophoresis assay further confirms the binding of the complexes with the pBR322 plasmid DNA. The minimum inhibitory concentrations of the complexes indicate that complex 1 exhibits very high antibacterial activity against standard bacterial strains of Escherichia coli, Salmonella typhimurium, and Staphylococcus aureus, being much higher than those of AgNO3, silver sulfadiazine, ciprofloxacin, and gentamicin. Moreover, complexes 1-3 exhibit very high cytotoxic activity against A549 and MCF-7 cancer cell lines, compared with AgNO3 and cisplatin. The bacterial and cell growth inhibitions of the silver(I) complexes are closely related to their DNA binding affinities.Öğe Effect of immobilization on catalytic characteristics of saturated Pd-N-heterocyclic carbenes in Mizoroki-Heck reactions(Elsevier Science Sa, 2006) Aksin, Ozge; Turkmen, Hayati; Artok, Levent; Cetinkaya, Bekir; Ni, Chaoying; Buyukgungor, Orhan; Ozkal, ErhanA saturated Pd-N-heterocyclic complex was immobilized on an amorphous silica. The complex itself is of very high thermal stability. However, TEM observations, hot filtration, reusability, and poisoning tests all revealed that the complex acted only as a precatalyst to highly active Pd species in Mizoroki-Heck reactions when immobilized. The complex appears more stable when used under homogeneous reaction conditions. The immobilized complex afforded high turnover numbers, 10(4)-10(5). The higher turnover frequencies were realized at the lower Pd concentrations, which is a characteristic property of ligand-free Pd catalyzed reactions. (c) 2006 Elsevier B.V. All rights reserved.Öğe A highly novel dinickel complex: A hydrogen-bonded anti-skew carboxylate bridge and a 2D supramolecular structure(Elsevier Science Bv, 2009) Korkmaz, Neslihan; Gokce, Aytac Gurhan; Astley, Stephen T.; Aygun, Muhittin; Astley, Demet; Buyukgungor, OrhanReaction of the tridentate Schiff base ligands obtained from 2,4-dihydroxybenzaldehyde and either L-iso-leucine or L-tert-leucine with Ni(NO3)(2) in methanol/water solution in the presence of base afforded dinickel complexes. The crystal structure of the product derived from L-tert-leucine has been determined by X-ray crystallography. The octahedrally coordinated two Ni centers were found to be bridged by a single carboxylate group in an extremely unusual non-planar fashion. A 2D supramolecular structure, constructed by infinite hydrogen-bonded complex sheets parallel to the ab-plane of the unit cell, arises from intermolecular O-H center dot center dot center dot O hydrogen bonds. (C) 2009 Elsevier B.V. All rightsÖğe A highly novel dinickel complex: A hydrogen-bonded anti-skew carboxylate bridge and a 2D supramolecular structure(Elsevier Science Bv, 2009) Korkmaz, Neslihan; Gokce, Aytac Gurhan; Astley, Stephen T.; Aygun, Muhittin; Astley, Demet; Buyukgungor, OrhanReaction of the tridentate Schiff base ligands obtained from 2,4-dihydroxybenzaldehyde and either L-iso-leucine or L-tert-leucine with Ni(NO3)(2) in methanol/water solution in the presence of base afforded dinickel complexes. The crystal structure of the product derived from L-tert-leucine has been determined by X-ray crystallography. The octahedrally coordinated two Ni centers were found to be bridged by a single carboxylate group in an extremely unusual non-planar fashion. A 2D supramolecular structure, constructed by infinite hydrogen-bonded complex sheets parallel to the ab-plane of the unit cell, arises from intermolecular O-H center dot center dot center dot O hydrogen bonds. (C) 2009 Elsevier B.V. All rightsÖğe [mu-1,1 '-Bis(2,4,6-trimethylbenzyl)-3,3 '-(2,3,5,6-tetramethyl-p-phenylenedibenzimidazole)-2,2 '-diylidene]di-mu-bromo-disilver(I)(Blackwell Publishing, 2007) Kosar, Basak; Turkmen, Hayati; Cetinkaya, Bekir; Buyukgungor, OrhanThe title compound, [Ag2Br2(C46H50N4)], contains a bulky bis(N-heterocyclic carbene) ligand, comprising two benzimidazolium groups linked through a 2,3,5,6-tetramethyl-1,4-xylylene bridge. The compound was formed by reaction of the bromide salt of the ligand with Ag2O in dichloromethane. The discrete compound is formed in preference to a postulated coordination polymer. Each Ag-I atom is coordinated by the carbene C atom and two Br atoms in a trigonal planar geometry.Öğe A mu-chloro-bridged dinuclear ruthenium complex with 9H-carbazole: the formation of one-dimensional linear chains of star-shaped edge-fused rings(Blackwell Publishing, 2006) Dincer, Muharrem; Ozdemir, Namik; Dayan, Osman; Cetinkaya, Bekir; Buyukgungor, OrhanThe title complex, di-mu-chloro-bis[chloro(eta(6)-p-cymene)ruthenium(II)]-9H-carbazole (1/2), [Ru2Cl4(C10H14)(2)](.)2C(12)H(9)N, is composed of one [RuCl2(eta(6)-p-cymene)](2) and two 9H-carbazole molecules. There are one-half of a dinuclear complex and one 9H-carbazole molecule per asymmetric unit. In the dinuclear complex, each of the two crystallographically equivalent Ru atoms is in a pseudo-tetrahedral environment, coordinated by a terminal Cl atom, two bridging Cl atoms and the aromatic hydrocarbon, which is linked in a eta(6) manner; the (RuRu)-Ru-... separation is 3.688 (3) angstrom. The title complex has a crystallographic centre of symmetry located at the mid-point of the (RuRu)-Ru-... line. Intermolecular N-(HCl)-Cl-... and pi-pi stacking interactions are observed. These interactions form a four-pointed star-shaped ring and one-dimensional linear chains of edge-fused rings running parallel to the [100] direction, which stabilize the crystal packing.Öğe Palladium and platinum complexes of the new ligands containing P-N and P-O bonds(Pergamon-Elsevier Science Ltd, 2014) Irisli, Sevil; Karaman, Merve; Arda, Nilgun; Dindar, Bircan; Buyukgungor, OrhanA number of applications have been found for the variety complexes of Pd(II) and Pt(II) due to their marked catalytic activities. This study is intended to examine the seven and eight-membered novel complexes which have been prepared by P-N-C-C-O-P and P-N-C-C-C-O-P backbone ligands. The air-stable complexes [M = Pd (1a, 3a), Pt (1b, 3b)] containing aminophosphine-phosphinite metallocyclic rings were obtained with high yields. All the compounds were characterized by P-31{H-1}, C-13{H-1} and H-1 NMR spectroscopy, FTIR spectroscopy and elemental analysis. Furthermore, the structure of complexes (1a and 3a) were determined by X-ray crystallography. The novel complexes (1a and 3a) are very effective catalysts on Suzuki-Miyaura cross-coupling reactions of various aryl chlorides and aryl bromides with phenylboronic acid. (C) 2014 Elsevier Ltd. All rights reserved.Öğe Palladium Complexes with Tetrahydropyrimidin-2-ylidene Ligands: Catalytic Activity for the Direct Arylation of Furan, Thiophene, and Thiazole Derivatives(Amer Chemical Soc, 2015) Karaca, Emine Ozge; Gurbuz, Nevin; Ozdemir, Ismail; Doucet, Henri; Sahin, Onur; Buyukgungor, Orhan; Cetinkaya, BekirThe synthesis and characterization of novel 1,3-benzyl-3,4,5,6-tetrahydropyrimidin-2-ylidene-based N-hetero-cyclic carbene palladium(II) complexes (1a-d) were described. The crystal structure of trans-dichlorobis[1,3-bis(4-methylbenzyl)-3,4,5,6-tetrahydropyrimidin-2-ylidend- palladium(II) was presented. Pd(II) complexes 1a-d were tested as catalysts in the direct C5 or C2 arylation of furans, thiophenes, and thiazoles, with various aryl bromides at 150 degrees C for 1 h. These complexes exhibited moderate to high catalytic activities under the given conditions.Öğe Palladium Complexes with Tetrahydropyrimidin-2-ylidene Ligands: Catalytic Activity for the Direct Arylation of Furan, Thiophene, and Thiazole Derivatives(Amer Chemical Soc, 2015) Karaca, Emine Ozge; Gurbuz, Nevin; Ozdemir, Ismail; Doucet, Henri; Sahin, Onur; Buyukgungor, Orhan; Cetinkaya, BekirThe synthesis and characterization of novel 1,3-benzyl-3,4,5,6-tetrahydropyrimidin-2-ylidene-based N-hetero-cyclic carbene palladium(II) complexes (1a-d) were described. The crystal structure of trans-dichlorobis[1,3-bis(4-methylbenzyl)-3,4,5,6-tetrahydropyrimidin-2-ylidend- palladium(II) was presented. Pd(II) complexes 1a-d were tested as catalysts in the direct C5 or C2 arylation of furans, thiophenes, and thiazoles, with various aryl bromides at 150 degrees C for 1 h. These complexes exhibited moderate to high catalytic activities under the given conditions.Öğe Palladium Complexes with Tetrahydropyrimidin-2-ylidene Ligands: Catalytic Activity for the Direct Arylation of Furan, Thiophene, and Thiazole Derivatives(Amer Chemical Soc, 2015) Karaca, Emine Ozge; Gurbuz, Nevin; Ozdemir, Ismail; Doucet, Henri; Sahin, Onur; Buyukgungor, Orhan; Cetinkaya, BekirThe synthesis and characterization of novel 1,3-benzyl-3,4,5,6-tetrahydropyrimidin-2-ylidene-based N-hetero-cyclic carbene palladium(II) complexes (1a-d) were described. The crystal structure of trans-dichlorobis[1,3-bis(4-methylbenzyl)-3,4,5,6-tetrahydropyrimidin-2-ylidend- palladium(II) was presented. Pd(II) complexes 1a-d were tested as catalysts in the direct C5 or C2 arylation of furans, thiophenes, and thiazoles, with various aryl bromides at 150 degrees C for 1 h. These complexes exhibited moderate to high catalytic activities under the given conditions.Öğe Palladium N-heterocyclic carbene complexes: Synthesis, characterization and catalytic properties in amination(Elsevier Science Sa, 2010) Ozdemir, Ismail; Demir, Serpil; Sahin, Onur; Buyukgungor, Orhan; Cetinkaya, BekirTransmetalation has proved to be a promising procedure to obtain NHC-metal complexes, which typically involves treatment of the imidazolium salt with Ag2O to form the Ag-NHC complex, followed by transmetalation to a species such as [PdCl2(CH3CN)(2)] gave the palladium complex in which the N-heterocyclic carbene was bound to the metal center. New bis(NHC)-Pd complexes were synthesized and characterized by elemental analysis, H-1 NMR, C-13 NMR, and IR spectroscopy. The crystal and molecular structure of the trans-dichlorobis{1-(2,3,5,6-tetramethylbenzyl)-3-(2,3,4,5,6-pentamethylbenzyl)imidazolidin-2-yliden}palladium(II) complex was determined by single-crystal X-ray diffraction. The activity of the Pd(II) complexes in the coupling reaction of anilines or amines with bromobenzene was investigated. A preliminary catalytic study showed that these bis(NHC)-Pd complexes were highly active in the direct synthesis of triarylamines and secondary amines in a single step. (C) 2010 Elsevier B.V. All rights reserved.Öğe Piano-stool benzothiazol-2-ylidene Ru(II) complexes for effective transfer hydrogenation of carbonyls(Elsevier Science Sa, 2016) Oruc, Zeynep Ipek; Gok, Lutfiye; Turkmen, Hayati; Sahin, Onur; Buyukgungor, Orhan; Cetinkaya, BekirBenzothiazolium bromides (NSHC center dot HBr) (1a-j) with a variety of alkyl chain or benzyl substituents on N atom were prepared. The synthesis of ruthenium(II) (NSHC) complexes, (2a-j) could be achieved by in situ deprotonation of benzothiazolium salts with Ag2O and [RuCl2(p-cymene)](2). They were characterized by H-1, C-13, F-19 NMR, IR spectroscopy and elemental analysis. The molecular structures of 2d, 2e and 2g were ascertained by single-crystal X-ray diffraction studies. The catalytic properties of complexes, (2aej), with electron-donating or -withdrawing groups were investigated in transfer hydrogenation (TH) of ketones, and aldehydes with good to excellent yields. The presence of the CH2(CH2)(16)CH3 or CH2C6F5 on the N atom of the benzothiazol-2-ylidene complexes (2g, 2j) showed the highest activity for TH reaction. The catalytic properties of the N-alkyl substituted ruthenium(II) (NSHC) complexes(2h-j) may be interpreted by micelle effects. (C) 2016 Elsevier B.V. All rights reserved.Öğe Preparation and crystal structure of binuclear chloro{6-[[chloro(triphenylphosphine)platinum](mesitylimino)methyl]pyridin-2-yl}bis(triphenylphosphine)platinum(II)(Pergamon-Elsevier Science Ltd, 2008) Gunay, M. Emin; Dayan, Osman; Gokce, Aytac Gurhan; Aygun, Muhittin; Cetinkaya, Bekir; Buyukgungor, OrhanTreatment of N,N'-bis(mesityl)pyridine-2,6-carboxyimidoyldichloride, 1, in toluene solution with [Pt(PPh3)(4)] at 100 degrees C afforded a novel platinacyclic compound, 3, in 63% yield, instead of the expected compound 2. The molecular and crystal structures of the title compound, 3, have been determined by the single crystal X-ray diffraction technique. The coordination geometries around the Pt atoms are distorted square-planar. In the crystal structure, the molecules are linked by a pair of C-H center dot center dot center dot N hydrogen bonds into a centrosymmetric dinner with an R-2(2) (16) ring, centred at (1/2,1/2,1/2). (C) 2008 Elsevier Ltd. All rights reserved.Öğe Preparation of a series of Ru(II) complexes with N-heterocyclic carbene ligands for the catalytic transfer hydrogenation of aromatic ketones(Royal Soc Chemistry, 2012) Gurbuz, Nevin; Ozcan, Emine Ozge; Ozdemir, Ismail; Cetinkaya, Bekir; Sahin, Onur; Buyukgungor, OrhanThe reaction of [RuCl2(p-cymene](2) with Ag-N-heterocyclic carbene (NHC) complexes yields a series of [(p-cymene) Ru(NHC)] complexes (2a-f). All synthesised compounds were characterized by elemental analysis, NMR spectroscopy and the molecular structure of 2a was determined by X-ray crystallography. All complexes have been tested as catalysts for the transfer hydrogenation of aromatic ketones, showing excellent activity in this reaction.Öğe Silver, palladium and rhodium complexes of acenaphthylene-anuilated N-heterocyclic carbene ligands: A comparative study(Wiley-V C H Verlag Gmbh, 2006) Turkmen, Hayati; Sahin, Onur; Buyukgungor, Orhan; Cetinkaya, BekirThe newly prepared carbene precursor 1,3-dimesitylacenaphtho[1,2-d]imidazolinium chloride, (NHC-H)Cl, 3, could be readily converted into the NHC-silver(l) complex, 4, which is an efficient carbene transfer agent and has been used to synthesise thione 5, trans-[PdCl2(NHC)(2)], 6 and [RhCl(NHC)(COD)], 7. All compounds synthesised were characterised by elemental analysis, NMR spectroscopy and the molecular structures of the thione 5 and complex 7 were determined by X-ray crystallography. Complex 7 was converted into cis-[RhCl(NHC)(CO)(2)] and the electron donating properties and trans influence of the NHC ligand were compared with nonamillated counterparts. The catalytic activity in the Heck reaction of 6 and the in situ formed palladium complex was evaluated. The activity of the in situ formed complexes for the Heck coupling of alkenes was high. (c) Wiley-VCH Verlag GmbH & Co.Öğe Synthesis and catalytic activity of ruthenium(II) complexes containing pyridine-based tridentate triamines ('NNN') and pyridine carboxylate ligands (NO)(Elsevier Science Sa, 2012) Dayan, Osman; Ozdemir, Namik; Serbetci, Zafer; Dincer, Muharrem; Cetinkaya, Bekir; Buyukgungor, OrhanThe reaction of [(p-cymene)RuCl2](2) with K[NOa-b] (NO- = 2-picolinate, a or 2-quinaldinate, b) gave neutral [(p-cymene)RuCl(NOa-b)] (1a-b), complexes which were treated with pyridine-based meridional triamine ligands ('NNN') to create complexes of the type [RuCl(NOa-b)('NNN')] (2a: 'N = N-d, NOa(-) = 2-picolinato; 2b: 'N = N-d, NOb- = 2-quinaldinato; 3a: 'N = N-b, NOa- = 2-picolinato; 3b: 'N = N-b, NOb- = 2-quinaldinato; 4a: 'N = N-p, NOa- = 2-picolinato; 4b: 'N = N-p, NOb- = 2-quinaldinato). The new compounds were characterized by elemental analysis, IR and NMR spectroscopy and, 1b was studied by single crystal X-ray diffraction. The complexes 1-4 have been employed as catalysts for the transfer hydrogenation (TH) of acetophenone derivatives to secondary alcohols in the presence of KOH using 2-propanol as a hydrogen source at 82 degrees C. The highest catalytic activity was obtained with 3a. (C) 2012 Elsevier B. V. All rights reserved.Öğe The synthesis and structural characterization of a N-heterocyclic carbene-substituted palladacycle(Taylor & Francis Ltd, 2007) Gokce, Aytac Guerhan; Gunay, M. Emin; Aygun, Muhittin; Cetinkaya, Bekir; Buyukgungor, OrhanReaction of {[Pd(dmba)(mu-Cl)](2)} (dmba=(CH3)(2)NCH2C6H4) with ail ill situ generated N-heterocyclic carbene (NHC=1,3-dimesitylimidazolidin-2-ylidene) afforded crystals containing [chloro-(1,3-dimesitylimidazolidin-2-ylidene)(N,N-dimethylaminobenzyl-C-1,N) palladium(II)] (VII). Molecular and crystal structures of the title compound have been determined by single crystal X-ray diffraction technique. Complex VII crystallizes in space group Pi, with a=13.685(3) angstrom, b = 13.590(2) angstrom, c - 16.229(3) angstrom, alpha = 87.162(13)degrees, beta=70.514(15)degrees, y=84.153(16)degrees, Z=4, D-Calcd=1.367g cm(-3). There are two independent molecules in the asymmetric unit.