syn, E-1-cyclopentano-4-ethyl-3-thiosemicarbazone and syn, E-1-cyclopentano-4-phenyl-3-thiosemicarbazone

摘要

The structures of two thiosemicarbazones are described: syn, E-1-cyclopentano-4-ethyl-3-thiosemicarbazone (1) and syn, E-1-cyclopentano-4-phenyl-3-thiosemicarbazone (2). Crystal data: for 1: tetragonal, P4_3 (#78), a = b = 8.922(7) A, c = 12.899(13) A, and Z = 4; for 2: monoclinic a = 15.163(18) A, b = 7.482(5) A, c = 12.467(15) A, #beta# = 119.04(7) deg, and Z = 4. In 1, molecules are linked by hydrogen-bonding into infinite chains with non-planar 9-ring subunits in which thioamides interact with the H-N-C-N-N groups of neighbors. Thioamide groups in 2 form dimers linked by N-B...HS hydrogen-bonds with a planar 8-ring as in solid state structures of carboxylic acids. The semicarbazide syn conformation fosters formation of N-H...N intramolecular hydrogen-bonding in each structure. The solid state structures are consistent with their infrared and proton nuclear magnetic resonance spectra.