R. Howie, Marcos V. N. de Souza, A. Pinheiro
2011
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Abstract
Abstract The molecular structures of tert-butyl (S)-2-hydroxy-[N-(substituted-benzylidene)hydrazinyl-carbonyl]-ethylcarbamates, C15H20N3O4X (3: X = H, o-OH, o-NO2, m-NO2 and p-CN), derived from L-serine, are formally rather similar. Despite the variation in substituent, X, tricälinic (3: X = H), (3: X = o-OH), (3: X = m-NO2) and (3: X = p-CN) are isostructural and exhibit, with minor variations, the same fundamental intermolecular O—H···O and N—H···O hydrogen-bond connectivity in two-dimensions in layers of molecules. In monoclinic (3: X = o-NO2), however, the oxygen atoms of the nitro group function as additional O—H···O and N—H···O hydrogen-bond acceptors resulting in a more complex form of two-dimensional connectivity.