Structural, Spectral, Biological and Electrochemical Studies Of Some ...

thione S in a molecule on one side and N (2) H to a pyridyl nitrogen of a second
molecule on the opposite side (Fig 2.10). The molecules are packed into molecular
columns to the b direction. Analysis of short ring interactions prove that the self
assembly in the crystal lattice is controlled by intra and inter molecular H-bonding
net works and not by the so called ring- ring interactions or herringbone interactions.
Significant intermolecularhydrogen bonding (Fig 2.9) is consistent with high density
[15]. Although an intermolecular N---H----S bond might be expected which
crystallize in space group P21/c, the N---S distance measured, 3.7 A is well above the
usual range 3.25A.
Fig 2.10. Packingdiagram for compoundHL4M viewed along b axis.
2.9.2 Description ofcrystalstructureofHL4A
Suitable crystals of HL4A were grown by slow evaporation of a dilute solution of
dichloromethane, Our intention was to develop the E or Z conformer of the
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