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    2-Methyl-3-(5-methyl-2-thienyl)-5-phenylperhydropyrrolo[3,4-d]isoxazole-4,6-dione
    (Int Union Crystallography, 2009) Odabaşoğlu, Mustafa; Özkan, Hamdi; Yıldırır, Yilmaz; Büyükgüngör, Orhan
    In the molecule of the title compound, C17H16N2O3S, the phenyl ring is oriented with respect to the thiophene and succinimide rings at dihedral angles of 88.08 (3) and 57.81 (3)degrees, respectively; the dihedral angle between the thiophene and succinimide rings is 35.69 (3)degrees The isoxazole ring adopts an envelope conformation with the N atom at the flap position. In the crystal structure, intermolecular C-H center dot center dot center dot O hydrogen bonds link the molecules into infinite chains along the b axis. Weak C-H center dot center dot center dot pi interactions may further stabilize the structure.
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    3-Hydroxy-1,3-di-p-tolylpropenone
    (Blackwell Munksgaard, 2005) Dege, Necmi; Yıldırım, İsmail; Güldeste, Ayhan; Inaç, Hasan; Koca, İrfan; Kahveci, Nermin; Büyükgüngör, Orhan
    The title molecule, C17H16O2, lies on a crystallographic twofold rotation axis. The dihedral angle between the planes of the two symmetry-related benzene rings is 15.56 (4)degrees. The molecular structure is stabilized by intramolecular O-H...O and C-H...O hydrogen bonds.
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    Dipotassium maleate with boric acid
    (Blackwell Publishing, 2007) Tombul, Mustafa; Güven, Kutalmış; Büyükgüngör, Orhan; Aktaş, Huseyin; Durlu, Tahsin Nuri
    In the title compound, poly[(mu(3)-boric acid)-mu(4)-maleato-dipotassium], [K-2(C4H2O4){B(OH)(3)}](n), there are two independent K+ cations, one bonded to seven O atoms ( three from boric acid and four from maleate), and the other eight-coordinate via three boric acid and four maleate O atoms and a weak eta(1)-type coordination to the C = C bond of the maleate central C atoms. Hydrogen bonding links the boric acid ligands and maleate dianions, completing the packing structure.
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    Novel phosphazene derivatives: Synthesis, anisochronism and structural investigations of mono- and ditopic spiro-crypta phosphazenes
    (Elsevier, 2007) Asmafiliz, Nuran; İlter, Elif Ece; Isıklan, Muhammet; Kilic, Zeynel; Tercan, Baris; Caylak, Nagihan; Büyükgüngör, Orhan
    The reactions of hexachlorocyclotriphosphazatriene, N3P3Cl6, with N2O2-donor type coronands (diaza-crown ethers) 1-3 afford novel monotopic 4-7 and ditopic 8-10 spiro-crypta phosphazenes, respectively. It has been observed that the reactions of N3P3Cl6 with I equivalent amount of coronands 1-3 yield only monotopic spiro-derivatives, while three equivalent amount of coronands 2 and 3 give dominantly ditopic dispiro-crypta-phosphazene skeletons. On the other hand, the P-31 NMR spectrum of 8 indicates that the ditopic spiro-ansa phosphazene 10 is present besides the ditopic dispiro derivative 8. Unexpectedly, the reaction of 6 with excess amount of pyrrolidine leads to the formation of geminal product 7. The P-31 NMR spectra of 4, 5, 6 and 10 indicate that all of these compounds have anisochronism. The structures of 5, 8 and 9 have been determined by X-ray crystallography. The relative radii of macrocyclic hole sizes of 5, 8 and 9 are calculated from the crystallographic results. The relationships between the exocyclic NPN and endocyclic NPN bond angles of the analogous compounds with delta P-shifts of NPN phosphorus atoms have been discussed. Thus, sums of the bond angles around the nitrogen atoms are in the range of [342.7(2)degrees-354.4(2)degrees], showing that the nitrogen atoms have pyramidal configurations. The pyramidal configuration gives rise to stereogenic properties. The salient spectroscopic features [FTIR, H-1, C-13, P-31 NMR, HETCOR (for 5 and 7) and MS] of all the compounds are presented. (c) 2006 Elsevier B.V. All rights reserved.
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    Poly[[diaquacaesium(I)]bis(μ 3 -3-carboxypyrazine-2-carboxylato)]
    (Int Union Crystallography, 2007) Tombul, Mustafa; Güven, Kutalmış; Büyükgüngör, Orhan
    The asymmetric unit of the title compound, [Cs(C6H3N2O4)(2)(H2O)(2)](n), contains one Cs-I cation on an inversion centre, one 3-carboxypyrazine-2-carboxylate anion and one water molecule. In the crystal structure, each anion is linked to three cations, while each cation is surrounded by six of the anions. In addition, each cation is coordinated by two water O atoms, raising the coordination number to ten. In the crystal structure, intermolecular O - H center dot center dot center dot O and O - H center dot center dot center dot N hydrogen bonds contribute to the stabilization of the structure.