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    Structure of (2E)-Ethyl 2-((4-(cyanomethoxy)benzylidene)hydrazono)-3,4-dimethyl-2,3-dihydrothiazole-5-carboxylate Studied by X-ray and DFT Calculations
    (Pleiades Publishing Inc, 2017) Ustabas, Resat; Er, Mustafa; Tahtaci, Hakan; Coruh, Ufuk
    The molecular structure of (2E)-ethyl 2-((4-(cyanomethoxy)benzylidene)hydrazono)-3,4-dimethyl-2,3-dihydrothiazole-5-carboxylate was determined using X-ray diffraction. The crystals are triclinic: sp. gr. P (1) over bar; Z = 2; the unit cell parameters a = 8.4747(7)angstrom, b = 8.9382(8)angstrom , c = 11.9913(10)angstrom . The title compound has two C-H center dot center dot center dot O type intramolecular hydrogen bonds, one C-H center dot center dot center dot O and one C-H center dot center dot center dot N type intermolecular hydrogen bonds. For theoretical calculations, the molecular structure was investigated by DFT/B3LYP method with 6-311G(d) and 6-311G(d, p) basis sets. The calculated and experumental results (bond lenghts, bond angles, and dihedral angles) were compared with each other. Total energy, dipole moment, and mulliken atomic charges were calculated using two different basis sets.
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    Synthesis and characterization of novel triazol compounds containing a thiophen ring as potential antifungal agents and the structure of 2-(2-hydroxy-2-p-tolyethyl)-5-(thiophen-2-ylmethyl)-4-(4H-1,2,4-triazol-4-yl)-2H-1,2,4-triazol-3(4H)-one
    (Tubitak Scientific & Technological Research Council Turkey, 2010) Unver, Yasemin; Dugdu, Esra; Sancak, Kemal; Er, Mustafa; Ustabas, Resat
    A series of new 4-(3,5-disubstitue-4H-1,2,4-triazol-4-yl)-5-(thiophen-2-yl-methyl)-2H-1,2,4-triazol-3(4H)-ones (3a-c) were obtained by reaction N'-1-ethoxy-2-thiophen-2-yl-ethylydene hydrazino carboxylic acid ethyl ester (1) and 4-amino-4H-1,2,4-triazoles (2). 4-(3,5-disubstitue-4H-1,2,4-triazol-4-yl)-2-(2-oxo-2-arylethyl)-5-(thiophen-2-yl-methyl)-2H-1,2,4-triazol-3(4H)-ones (4a-e) and ethyl 2-(4-(3,5-disubstitue-4H-1,2,4-triazol-4-yl)-5-oxo-3-(thiophen-2-ylmethyl)-4,5-dihydro-1,2,4-triazol-1-yl) acetates (6a-c) were obtained by reaction of compounds 3 and bromoacetophenon derivatives and bromo ethylacetate, respectively. Compounds 5a-e were synthesized from the reaction of corresponding compounds 4a-e with NaBH4. Compounds 7a-c were obtained by the reaction compounds 6 and LiAlH4. Seventeen new compounds were synthesized and characterized by elemental analyses, IR, H-1-NMR, and C-13-NMR spectral data. The structure of compound 5d was inferred through IR, H-1-, C-13-NMR, elemental analyses, and X-ray spectral techniques. In addition, the newly synthesized chemicals were screened for their antibacterial and antifungal properties. Among the chemicals tested, 6a and 6b exhibited the highest degree of antifungal activity.
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    X-ray and Theoretical Studies of 2-((5-Amino-1,3,4-thiadiazol-2-yl)thio)-1-phenylethanone
    (Pleiades Publishing Inc, 2017) Ustabas, Resat; Coruh, Ufuk; Er, Mustafa; Tahtaci, Hakan
    The crystal structure of 2-((5-amino-1,3,4-thiadiazol-2-yl)thio)-1-phenylethanone was determined by X-ray diffraction method. The compound crystallizes in orthorhombic crystal system, sp. gr. Pbca. The atoms that constitute thiadiazole and phenyl rings do not form any significant deviation from the ring planes. Compound has two intermolecular N-H center dot center dot center dot N hydrogen bonds and one C-H center dot center dot center dot pi interaction. Using DFT/B3LYP method with 6-31G(d), 6-311G(d), 6-311G(d, p), and 6-311++G(d, p) basis sets, the molecular geometry of the compound was optimised. Bond lenghts, bond angles, torsion angles, dihedral angles, and HOMO-LUMO were calculated from the optimised geometry of the compound. The results obtained by X-ray diffraction method were compared with the results obtained through four different basis sets. Total energy of the molecule was calculated for four different basis sets.