Acta Crystallographica Section C

Crystal Structure Communications

Volume 61, Part 10 (October 2005)

organic compounds

hj1061 scheme

Acta Cryst. (2005). C61, o589-o592 [ doi:10.1107/S0108270105024959 ]

Isatin 3-semicarbazone and 1-methylisatin 3-semicarbazone

G. Pelosi, C. Pelizzi, M. Belicchi Ferrari, M. C. Rodríguez-Argüelles, C. Vieito and J. Sanmartín

Abstract: The two title semicarbazones, namely 2,3-dihydro-1H-indole-2,3-dione 3-semicarbazone, C₉H₈N₄O₂, (I), and 1-methyl-2,3-dihydro-1H-indole-2,3-dione 3-semicarbazone, C₁₀H₁₀N₄O₂, (II), show the same configuration, viz. Z around the imine C=N bond and E around the C(O)-NH₂ bond, stabilized by two intramolecular hydrogen bonds. The presence of a methyl group on the isatin N atom determines the difference in the packing; in (I), the molecules are linked into chains which lie in the crystallographic (102) plane and run perpendicular to the b axis, while in (II), the molecules are arranged to form helices running parallel to a crystallographic screw axis in the a direction.

Formula: C₉H₈N₄O₂ and C₁₀H₁₀N₄O₂


	Structure factor file (CIF format) (66.8 kbytes) Contains datablock I

	Structure factor file (CIF format) (44.3 kbytes) Contains datablock II

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