Prathapachandra Kurup, M R; Sithambaresan, M; Jayakumar, K(October 31, 2011)
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Abstract:
The title compound, C15H16N4S, exists in the Z conformation
with the thionyl S atom lying cis to the azomethine N atom.
The shortening of the N—N distance [1.3697 (17) A ° ] is due to
extensive delocalization with the pyridine ring. The hydrazine–
carbothioamide unit is almost planar, with a maximum
deviation of 0.013 (2) A ° for the amide N atom. The stability of
this conformation is favoured by the formation of an
intramolecular N—H N hydrogen bond. The packing of
the molecules involves no classical intermolecular hydrogenbonding
interactions; however, a C—H interaction occurs
Prathapachandra Kurup, M R; Jessy, Emmanuel; Sithambaresan, M(November 3, 2011)
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Abstract:
The title compound, C11H9N3O2, exists in the E conformation
with respect to the azomethane C N bond, and has the keto
form. There are two independent molecules in the asymmetric
unit and each of these features a slight slanting of the pyridine
and furan rings, which form a dihedral angle of 14.96 (10) in
one of the molecules and 5.53 (10) in the other. The crystal
structure is stabilized by N—H O and N—H N hydrogen
bonds, weak C—H O and C—H N hydrogen bonds and
C—H interactions and – interactions [shortest
centroid–centroid distance = 3.7864 (15) A ° ].
Prathapachandra Kurup, M R; Nisha, K; Sithambaresan, M(November 21, 2011)
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Abstract:
The title compound, C21H19N3O2S, exists in the thione form.
The configuration about the C N bond is E. The
hydrazinecarbothioamide unit adopts an almost planar
arrangement, with maximum deviations of 0.016 (3) and
0.016 (2) A ° for the two thiourea N atoms. An intramolecular
O—H N hydrogen bond occurs. Weak intermolecular N—
H S, C—H O and C—H interactions are observed in
the crystal structure