Yazar "Akkurt, Mehmet" seçeneğine göre listele
Listeleniyor 1 - 20 / 28
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe 1,3-Bis(3-phenylpropyl)-1H-1,3-benzimidazole-2(3H)-selone(Wiley-Blackwell, 2011) Akkurt, Mehmet; Yilmaz, Ulku; Kucukbay, Hasan; Buyukgungor, OrhanThe title molecule, C25H26N2Se, has mirror symmetry, with the mirror plane passing through the atoms of the C=Se bond and the mid-points of the two C-C bonds of the benzene ring of the benzimidazole group. The dihedral angle between the benzimidazole ring system and the phenyl ring is 71.62 (14)degrees.Öğe 1,3-Bis(3-phenylpropyl)-1H-benzimidazol-3-ium-2-carbodithioate(Wiley-Blackwell Publishing, Inc, 2009) Akkurt, Mehmet; Yilmaz, Ulku; Kucukbay, Hasan; Gencaslan, Mustafa; Buyukgungor, OrhanThe title compound, C(26)H(26)N(2)S(2), was synthesized from bis[1,3-bis(3-phenylpropyl)benzimidazolidine-2-ylidene] and CS(2) in toluene. The molecular structure is composed of a benzimidazole ring system with two phenylpropyl substituents and a dithiocarboxylate group in the 2-position. The benzimidazole unit is essentially planar, with a maximum atomic deviation of 0.008 (2) angstrom, and makes dihedral angles of 72.72 (10) and 27.62 (12)degrees, with the two phenyl rings. The dihedral angle between the two phenyl rings is 55.98 (15)degrees. The molecular packing is stabilized by a C-H center dot center dot center dot S intermolecular hydrogen-bonding interaction and a C-H center dot center dot center dot pi interaction between a benzene H atom and the phenyl ring of a neighbouring molecule.Öğe 1,3-Bis(3-phenylpropyl)-1H-benzimidazole-2(3H)-tellurone(Blackwell Publishing, 2008) Yalcin, Serife Pinar; Akkurt, Mehmet; Yilmaz, Uelkue; Kucukbay, Hasan; Buyukgungor, OrhanThe title compound, C25H26N2Te, was synthesized from bis[1,3-bis(3-phenylpropyl)benzimidazolidin-2-ylidene] and Te in a toluene solution. The molecule possesses a twofold rotation axis passing through the Te atom and the center of the benzimidazole ring system. The benzimidazole ring system makes an angle of 67.9 (4) with the phenyl rings.Öğe 1,3-bis(3-phenylpropyl)benzimidazolium bromide monohydrate(Int Union Crystallography, 2008) Akkurt, Mehmet; Karaca, Selvi; Yilmaz, Ulku; Kucukbay, Hasan; Buyukgungor, OrhanIn the title compound, C25H27N2+center dot Br-center dot H2O, the benzimidazole unit is essentially planar, with a maximum deviation of 0.020 (6) angstrom. The benzimidazole unit makes dihedral angles of 83.6 (3) and 81.0 (3)degrees with the two terminal phenyl rings. The dihedral angle between the phenyl rings is 58.5 (4)degrees. In the crystal structure, there are C-H center dot center dot center dot O hydrogen bonds, a C H center dot center dot center dot pi interaction between a phenyl H atom and the phenyl ring of a neighbouring molecule, and pi-pi interaction [3.512 (3) angstrom] between the centroids of the five-membered ring and the benzene ring of the benzimidazole unit of an adjacent molecule.Öğe 1,3-Bis[(5-aminofuran-2-yl) methyl]3,4,5,6-tetrahydropyrimidin-1-ium hexafluorophosphate(Int Union Crystallography, 2013) Akkurt, Mehmet; Akkoc, Senem; Gok, Yetkin; Tahir, Muhammad NawazThe asymmetric unit of the title salt, C16H21N2O2 (+) center dot PF6 (-), contains half of the whole ion pair, which has crystallographic mirror symmetry. Two F atoms related by the mirror plane are disordered over two sites of equal occupancy. The dihedral angle between the central ring and the furan ring is 59.3 () degrees. In the crystal, the anions and cations are linked through CH center dot center dot center dot F interactions, forming a three- dimensional network.Öğe 1,3-Difurfurylbenzimidazolium chloride monohydrate(Wiley-Blackwell, 2009) Akkurt, Mehmet; Sireci, Nihat; Deniz, Selma; Kucukbay, Hasan; Buyukgungor, OrhanThe title compound, C17H15N2O2+center dot Cl-center dot H2O, was synthesized from benzimidazole and furfryl chloride in dimethylformamide. The cationic benzimidazolium ring is connected to two furan rings via methylene bridges. The furan rings make dihedral angle of 79.09 (18)degrees with respect to each other, and make dihedral angles of 73.92 (12) and 72.58 (13)degrees with respect to the benzimidazole ring. O-H center dot center dot center dot Cl, C-H center dot center dot center dot O and C-H center dot center dot center dot Cl hydrogen bonds and C-H center dot center dot center dot pi interactions contribute to the stabilization of the crystal structure. Furthermore, there is a pi-pi interaction between adjacent five- and six-membered rings of the benzimidazole groups [centroid-centroid distance = 3.5305 (8) angstromÖğe 1-(Prop-2-en-1-yl)-3-[(trimethylsilyl)methyl]benzimidazolium bromide monohydrate(Int Union Crystallography, 2010) Baktir, Zeliha; Akkurt, Mehmet; Sireci, Nihat; Kucukbay, HasanIn the title compound, C14H21N2Si+center dot Br-center dot H2O, the benzimidazole ring system is almost planar [maximum deviation = 0.021 (2) angstrom]. In the crystal, O-H center dot center dot center dot Br and C-H center dot center dot center dot O hydrogen bonds link the ions via the O atoms of the water molecules. In addition, there are pi-pi stacking interactions between the centroids of the benzene and imidazole rings of the benzimidazole ring system [centroid-centroid distances = 3.521 (3) and 3.575 (2) angstrom].Öğe 1-Benzyl-3-[(trimethylsilyl)methyl]benzimidazolium chloride monohydrate(Wiley-Blackwell, 2010) Akkurt, Mehmet; Celik, Ismail; Kucukbay, Hasan; Sireci, Nihat; Buyukgungor, OrhanThe title compound, C(18)H(23)N(2)Si(+)center dot Cl(-)center dot H(2)O, was synthesized from 1-[(trimethylsilyl)methyl]benzimidazole and benzyl chloride in dimethylformamide. The benzimidazole ring system is approximately planar, with a maximum deviation of 0.022 (2) angstrom, and makes an angle of 74.80 (12)degrees with the phenyl ring. The crystal packing is stabilized by O-H center dot center dot center dot Cl, C-H center dot center dot center dot Cl, C-H center dot center dot center dot O and C-H center dot center dot center dot pi interactions between symmetry-related molecules together with pi-pi stacking interactions between the imidazolium and benzene rings [centroid-centroid distance = 3.5690 (15) angstrom] and between the benzene rings [centroid-centroid distance = 3.7223 (14) angstrom].Öğe 1-cyclohexylmethyl-3-methyl-2-[(phenyl-imino)(sulfido)methyl]benzimidazolium(Int Union Crystallography, 2008) Akkurt, Mehmet; Karaca, Selvi; Kucukbay, Hasan; Sireci, Nihat; Buyukgungor, OrhanIn the zwitterionic title compound, C22H25N3S, the benzimidazole ring system makes a dihedral angle of 55.69 (11) degrees with the phenyl ring. In the crystal structure, inter- and intramolecular C-H center dot center dot center dot S interactions occur.Öğe 1-{[Dimethyl(phenyl) silyl] methyl}-3-(2-phenylethyl)-1H-benzimidazol-3-ium bromide monohydrate(Int Union Crystallography, 2012) Akkurt, Mehmet; Kucukbay, Hasan; Sireci, Nihat; Buyukgungor, OrhanThe title compound, C24H27N2Si+center dot Br-center dot H2O, was synthesized from 1-(dimethylphenylsilylmethyl)-1H-benzimidazole and (2-bromoethyl) benzene in dimethylformamide. The benzimidazole ring system is nearly planar, with a maximum deviation of 0.015 (5) angstrom, and forms dihedral angles of 73.0 (3) and 39.6 (2)degrees, with the phenyl rings. In the crystal, molecules are linked by O-H center dot center dot center dot Br, C-H center dot center dot center dot Br and C-H center dot center dot center dot O hydrogen bonds. In addition, the structure features pi-pi stacking interactions, with a face-to-face separation of 3.644 (3) angstrom between parallel benzimidazole ring systems.Öğe Catalytic activities in the direct C5 arylation of novel palladium N-heterocyclic carbene complexes containing benzimidazol-2-ylidene nucleus(Elsevier Science Sa, 2014) Akkoc, Senem; Gok, Yetkin; Akkurt, Mehmet; Tahir, Muhammad NawazNew palladium N-heterocyclic carbene (NHC) complexes (1a-e) were synthesized in very good yields by the reaction of 1-phenyl-3-alkylbenzimidazolium salts with Pd(OAc)(2) in dimethyl sulfoxide. These synthesized complexes were fully characterized using elemental analyses, FT-IR, H-1 NMR, C-13 NMR and LC-MS (for 1a, 1c and 1e) spectroscopy data. Also, the molecular structure of the bis[1-phenyl-3-(2methyl-1,4-benzodioxane)benzimidazol-2-ylidene] dibromopalladium(II) complex (1d) was structurally characterized by single crystal X-ray diffraction study. The new Pd-II complexes (1a-e) were tested as catalysts in the direct C5 arylation of 2-n-butylfuran, 2-n-butylthiophene and 2-n-propylthiazole with various aryl bromides at 130 degrees C for 1 h. Also, some experiments were carried out by using aryl chlorides in order to be used for comparison. The results are reported herein. These complexes exhibited quite high catalytic activities under the given conditions. (C) 2014 Elsevier B.V. All rights reserved.Öğe Chlorido[1-phenyl-3-(2,3,5,6-tetramethylbenzyl)benzimidazol-2-ylidene]silver(I)(Int Union Crystallography, 2012) Akkurt, Mehmet; Akkoc, Senem; Gok, Yetkin; Dagdemir, Yilmaz; Tahir, Muhammad NawazIn the title compound, [AgCl(C24H24N2)], the terminal phenyl and tetramethylbenzene rings [which form a dihedral angle of 87.92 (14)degrees] make dihedral angles of 59.59 (11) and 83.19 (12)degrees with respect to the central benzimidazole ring system. The Ag-C and Ag-Cl single-bond lengths are 2.087 (3) and 2.3267 (9)degrees. The C-Ag-Cl bond angle is 172.84 (7)degrees. C-H center dot center dot center dot pi interactions contribute to the stabilization of the crystal structure. A very weak pi-pi stacking interaction between adjacent tetramethylbenzene rings [centroid-centroid distance = 4.0610 (18) angstrom] is also observed.Öğe Crystal structure of 1,3-bis(4-methylbenzyl)-1H-1,3-benzimidazol-3-ium bromide monohydrate(Int Union Crystallography, 2015) Celikesir, Sevim Turktekin; Celik, Omer; Akkoc, Senem; Ilhan, Ilhanb Ozer; Gok, Yetkin; Akkurt, MehmetIn the title hydrated symetrically substituted 1,3-bis(4-methyl-benzyl) benzimidazolium salt, C23H23N2+center dot Br-center dot H2O, the dihedral angles between the benzimidazole ring system (r.m.s. deviation = 0.003 angstrom) and the pendant benzene rings are 73.18 (16) and 77.52 (16)degrees. Both benzene rings lie to the same side of the benzimidazole ring system, giving the cation an overall U-shape. In the crystal, the cation is linked to the water molecule by a short C-H center dot center dot center dot O hydrogen bond and the water molecule forms O-H center dot center dot center dot Br hydrogen bonds. Together, these interactions lead to [010] chains. The packing is consolidated by C-H center dot center dot center dot Br hydrogen bonds and aromatic pi-pi stacking interactions [centroid-centroid distances = 3.5401 (17) and 3.8815 (18) angstrom], generating a three-dimensional network.Öğe Crystal Structure of Dichloridobis[5-nitro-1-trimethylsilylmethyl-1H-benzimidazole-?N3] cobalt (II) N,N-dimethylformamide solvate.(Int Union Crystallography, 2010) Yalcin, Serife Pinar; Akkurt, Mehmet; Sireci, Nihat; Kucukbay, Hasan; Tahir, M. Nawaz[Abstract Not Available]Öğe DFT Studies and Crystal Structure of Synthesized 1,3-bis(2- thiophenylmethyl)-4,5-dihydroimidazolidinium hexafluorophosphate Salt(2017) Akkoç, Senem; Türktekin Çelikesir, Sevim; Gök, Yetkin; Sevtap Çağlar, Yavuz; Akkurt, Mehmet; Özdemir, NamıkAbstract: The synthesized compound 5, (C13H15N2S2)[PF6], was fully characterized with Xray diffraction method. In this compound, the asymmetric unit contains a 1,3-(2thiophenylmethyl)-4,5-dihydroimidazolidinium cation and a hexafluorophosphate anion. Due to an 180° rotation about the thiophene-CH2 bonds, the thiophene rings in the cation are disordered [site-occupancy factors = 0.903(4)/0.097(4) and 0.837(5)/0.163(5), respectively]. The short C--N bond lengths [1.303(4) and 1.287(4) Å] in the imidazolidine ring display partial electron delocalization within the N--C--N fragment. Anion and cations are connected through intermolecular C--H...F hydrogen bonds and three ?-? stacking interactions [centroid-centroid distances = 3.890(3), 3.852(5) and 3.816(7) Å] between the thiophene rings of the adjacent cations, forming layers parallel to (011). Furthermore, we studied theoretical studies of this compound, too. Geometry optimization was carried out in gas phase by Density Functional Theory (DFT) method with B3LYP applying 6-311++G**basis set. The obtained results from experimental and theoretical structural properties of compound 5 had been compared to each other.Öğe Dichloridobis[5-nitro-1-trimethylsilylmethyl-1H-benzimidazole-?N3]cobalt(II) N,N-dimethylformamide solvate(Int Union Crystallography, 2010) Akkurt, Mehmet; Yalcin, Serife Pinar; Sireci, Nihat; Kucukbay, Hasan; Tahir, M. NawazThe title compound, [CoCl2(C11H15N3O2Si)(2)]center dot C3H7NO, was synthesized from 5-nitro-1-trimethylsilylmethyl-1H-benzimidazole and cobalt(II) chloride in dimethylformamide. The Co-II atom is coordinated in a distorted tetrahedral environment by two Cl atoms and two N atoms. In the crystal structure, there are a number of C-H center dot center dot center dot Cl and C-H center dot center dot center dot O hydrogen-bonding interactions between symmetry-related molecules.Öğe (E)-1,1?-Bis[(E)-but-2-enyl]-3,3?-(propane-1,3-diyl)bis(1H-benzimidazol-3-ium) dibromide monohydrate(Wiley-Blackwell Publishing, Inc, 2008) Akkurt, Mehmet; Yildirim, Sema Oeztuerk; Sireci, Nihat; Kuecuekbay, Hasan; Bueyuekguengoer, OrhanThe title compound, C(25)H(30)N(4)(2+)center dot 2Br(-)center dot H(2)O, was synthesized from 1,1'-propylenedibenzimidazole and (E)-1-bromobut-2-ene in dimethylformamide solution. The two benzimidazole ring systems are essentially planar, with maximum deviations of 0.011 (4) and 0.023 (3) angstrom. The dihedral angle between these two ring systems is 25.87 (15)degrees. The crystal structure is stabilized by intermolecular O-H center dot center dot center dot Br and C-H center dot center dot center dot Br hydrogen-bonding interactions. Atmospheric water was incorporated into the crystal structure.Öğe Imidazole, pyrimidine and diazepine containing heteroaryl-substituted heterocyclic salts as efficient ligand precursors for Mizoroki-Heck coupling reaction: synthesis, structural characterization and catalytic activities(Springer, 2014) Gok, Yetkin; Akkoc, Senem; Akkurt, Mehmet; Tahir, Muhammad NawazThe nine new heteroaryl-substituted imidazolidinium (1a-c), pyrimidinium (2a-c) and diazepinium (3a-c) salts as N-heterocyclic carbene (NHC) precursors were synthesized in good yields and entirely characterized using elemental analyses and conventional spectroscopic methods. In situ formed complexes from heterocyclic salts (1-3), Pd(OAc)(2) and in the presence of KOBu (t) as a base were tested as catalysts for the Mizoroki-Heck coupling reaction in an aqueous media and very high yields were achieved. 1,3-Di(5-methylthiophen-2-ylmethyl)pyrimidinium hexafluorophosphate salt (2b) was structurally characterized by single-crystal X-ray diffraction. In the 2b compound (C16H21N2S2)(+)[PF6](-), the terminal thiophene rings are twisted with a dihedral angle of 72.8(3)A degrees. In the pyrimidine ring, the three successive C atoms between the N atoms are disordered over two positions [occupancy ratio 0.753(12):0.247(12)]. In the crystal, neighboring molecules are linked by C-HaEuro broken vertical bar F hydrogen bonds, running along the b axis.Öğe N- Phenyl- substituted carbene precursors and their silver complexes: synthesis, characterization and antimicrobial activities(Wiley, 2014) Gok, Yetkin; Akkoc, Senem; Albayrak, Sevil; Akkurt, Mehmet; Tahir, Muhammad NawazA series of unsymmetrically substituted N-heterocyclic carbene (NHC) precursors (1a, 1b, 1c, 1d, 1e) were synthesized from the reaction of N-phenylbenzimidazole with various alkyl halides. These compounds were used to synthesize NHC-silver(I) complexes (2a, 2b, 2c, 2d, 2e). The five new 1-phenyl-3-alkylbenzimidazolium salts (1a, 1b, 1c, 1d, 1e) and their NHC-silver complexes (2a, 2b, 2c, 2d, 2e) were characterized by the H-1 NMR, C-13 NMR and FT-IR spectroscopic methods and elemental analysis techniques. Also, the two NHC-silver complexes 2b and 2c were characterized by single-crystal X-ray crystallography, which confirmed the linear C?Ag?Cl arrangements. The antibacterial activities of the NHC precursor and NHC-silver complexes were tested against three Gram-positive bacterial strains (Bacillus subtilis, Listeria monocytogenes and Staphylococcus aureus) and three Gram-negative bacterial strains (Escherichia coli, Klebsiella pneumoniae and Pseudomonas aeruginosa) using the microdilution broth method. The NHC-silver complexes showed higher antibacterial activity than the NHC precursors. In addition, silver complexes 2a, 2b, 2c, 2d showed high antibacterial activity against the Gram-positive bacteria L. monocytogenes and S. aureus compared to the standard, tetracycline. Copyright (c) 2014 John Wiley & Sons, Ltd.Öğe Preparation and characterization of trimethylsilyl-substituted benzimidazole metal complexes and structural characterization of dichlorobis[1-(trimethylsilyl)methyl-1H-benzimidazole-N3]cobalt(II)(Taylor & Francis Ltd, 2010) Sireci, Nihat; Kucukbay, Hasan; Akkurt, Mehmet; Yalcin, Serife Pinar; Tahir, M. Nawaz; Ott, HolgerThe ligands 1-trimethylsilylmethylbenzimidazole, 5-methyl-1-trimethylsilylmethylbenzimidazole, and 5-nitro-1-trimethylsilylmethylbenzimidazole and their Co(II) and Zn(II) complexes were synthesized and characterized by 1H-NMR, 13C-NMR, and elemental analyses. The crystal structure of dichlorobis[1-(trimethylsilyl)methyl-1H-benzimidazole-N3]cobalt(II) has been determined by single crystal X-ray diffraction.