Cyclohexanone semicarbazone (CSC), CTH13N3 O,, CIIH21N30, each adopt a slightly distorted chair conformation, with an increase of the total puckering of the sixmembered ring for BCSC. The two crystal structures are very similar, with the NHCONH2 groups connected in infinite ribbons through O...H--N hydrogen bonds, with distances in the range 2.84-3.12/~. The conformation adopted by the C=O bond with respect to the N--N bond is trans in both crystals.
CommentIt is usually found in the crystal structures of uncomplexed thiosemicarbazones that the C=S bond is t On leave from the
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