Browsing by Author "Sethusankar, K"

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    Crystal structure of 3-[(E)-(2-hydroxy-3-methoxybenzylidene)amino]-1-methyl-1-phenylthiourea
    (International Union of Crystallography, 2016-04-05) Gangadharan, Rajeswari; Muralisankar, Mathiyan; Sreekanth, Anandaram; Rahman, Abdullakutty Anees; Sethusankar, K
    In the asymmetric unit of the title compound, C16H17N3O2S, there are two independent molecules (A and B), which show an E conformation with respect to the C=N bond. An intramolecular O - H⋯N hydrogen bond with an S(6) motif stabilizes the molecular structure. The terminal phenyl and benzene rings are almost orthogonal to each other, the dihedral angle being 87.47(13)° for molecule A and 89.86(17)° for molecule B. In the crystal, weak bifurcated N - H⋯(O,O) hydrogen bonds link the two independent molecules, forming a supramolecular chain with a C 2 1(14)[R 2 1(5)] motif along the b axis. A weak C - H⋯O interaction is also observed in the chain. © 2016.
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    Crystal structures of two hydrazinecarbo­thio­amide derivatives: (E)-N-ethyl-2-[(4-oxo-4H-chromen-3-yl)methyl­­idene]hydrazinecarbo­thio­amide hemi­hydrate and (E)-2-[(4-chloro-2H-chromen-3-yl)methyl­­idene]-N-phenyl­hydrazinecarbo­thio­amide
    (International Union of Crystallography, 2015-02-21) Gangadharan. Rajeswari; Haribabu, Jebiti ; Karvembu, Ramasamy ; Sethusankar, K
    The title compounds, C13H13N3O2S·0.5H2O, (I), and C17H14ClN3OS, (II), are hydrazinecarbothioamide derivatives. Compound (I) crystallizes with two independent molecules (A and B) and a water molecule of crystallization in the asymmetric unit. The chromene moiety is essentially planar in molecules A and B, with maximum deviations of 0.028 (3) and 0.016 (3) Å, respectively, for the carbonyl C atoms. In (II), the pyran ring of the chromene moiety adopts a screw-boat conformation and the phenyl ring is inclined by 61.18 (9)° to its mean plane. In the crystal of (I), bifurcated N - H⋯O and C - H⋯O hydrogen bonds link the two independent molecules forming A-B dimers with two R 12(6) ring motifs, and R 22(10) and R 22(14) ring motifs. In addition to these, the water molecule forms tetrafurcated hydrogen bonds which alternately generate R44(12) and R66(22) graph-set ring motifs. There are also π-π [inter-centroid distances = 3.5648 (14) and 3.6825 (15) Å] interactions present, leading to the formation of columns along the c-axis direction. In the crystal of (II), molecules are linked by pairs of N - H⋯S hydrogen bonds, forming inversion dimers with an R22(8) ring motif. The dimers are linked by C - H⋯π interactions, forming ribbons lying parallel to (210).