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  1. Manawar RB, Gondaliya MB, Shah MK, Jotani MM, Tiekink ERT
    Acta Crystallogr E Crystallogr Commun, 2019 Oct 01;75(Pt 10):1423-1428.
    PMID: 31636969 DOI: 10.1107/S2056989019012349
    The title Schiff base compound, C14H10Cl2N2O, features an E configuration about each of the C=N imine bonds. Overall, the mol-ecule is approximately planar with the dihedral angle between the central C2N2 residue (r.m.s. deviation = 0.0371 Å) and the peripheral hy-droxy-benzene and chloro-benzene rings being 4.9 (3) and 7.5 (3)°, respectively. Nevertheless, a small twist is evident about the central N-N bond [the C-N-N-C torsion angle = -172.7 (2)°]. An intra-molecular hy-droxy-O-H⋯N(imine) hydrogen bond closes an S(6) loop. In the crystal, π-π stacking inter-actions between hy-droxy- and chloro-benzene rings [inter-centroid separation = 3.6939 (13) Å] lead to a helical supra-molecular chain propagating along the b-axis direction; the chains pack without directional inter-actions between them. The calculated Hirshfeld surfaces point to the importance of H⋯H and Cl⋯H/H⋯Cl contacts to the overall surface, each contributing approximately 29% of all contacts. However, of these only Cl⋯H contacts occur at separations less than the sum of the van der Waals radii. The aforementioned π-π stacking inter-actions contribute 12.0% to the overall surface contacts. The calculation of the inter-action energies in the crystal indicates significant contributions from the dispersion term.
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