• x-ray molecular structure and theoretical study of 1,4-bis[2-cyano-2-(o-pyridyl)ethenyl]benzene

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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     the structural characterisation of the molecule 1,4-bis[2-cyano-2-(o-pyridyl)ethenyl] benzene obtained through knoevenagel condensation is reported. the single crystals, as light brown rods, were cultured from a chloroform solution using a slow evaporation method at ambient temperature. the compound crystallised in the monoclinic system belonging to the c2/c space group with a = 26.4556(9) å, b = 3.73562(10) å, c = 18.4230(6) å, β = 109.841(4)° and the asymmetric unit comprising z = 4. the structure is ordered and the molecules of the title compound exhibited a lattice with water molecules located at sites of inversion and two-fold axial symmetries. thus, only halves of the molecules are symmetrically independent. the lattice is reported and contrasted with x-ray single-crystal diffraction and theoretical calculations of 1,4-bis(1-cyano-2-phenylethenyl)benzene. by using density functional theory (dft) and second order moller-plesset (mp2) theoretical calculations, the ground state geometry in the whole molecule at the b3lyp/6-31+g(d,p), and mp2/6-31+g(d,p) theory levels, respectively, were optimised. the dft calculations showed a quasi-planar structure of the molecule, whereas the wave function-based mp2 method afforded a non-planar optimised structure with significant torsion angles between the pyridine and phenyl rings.

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