title: (S,S)-4''-Cyano-7,7''-dimethoxy-3',6'-dioxodispiro[indane-2,2'-piperazine-5',2''-indane]-4-carboxamide methanol solvate: interrupting the amide-to-amide hydrogen-bonded tape.
abstract: The title methanol solvate, C(24)H(22)N(4)O(5).CH(3)OH, forms an extended three-dimensional hydrogen-bonded structure, assisted by the presence of several good donor and acceptor sites. It shows none of the crystal packing features typically expected of piperazinediones, such as amide-to-amide R(2)(2)(8) hydrogen bonding. In this structure the methanol solvent appears to play only a space-filling role; it is not involved in any hydrogen bonding and instead is disordered over several sites. This study reports, to the best of our knowledge, the first crystal structure of an indane-containing piperazinedione compound which exhibits a three-dimensional hydrogen-bonded structure formed by classical (N-H...O and N-H...N) hydrogen-bonding interactions.
authors.affiliation: Department of Chemistry, The University of Arizona, 1306 East University Boulevard, Tucson, AZ 85721, USA.
authors.forename: Bhumasamudram
authors.initials: B
authors.lastname: Jagadish
authors.forename: Michael D
authors.initials: MD
authors.lastname: Carducci
authors.forename: Alice
authors.initials: A
authors.lastname: Dawson
authors.forename: Gary S
authors.initials: GS
authors.lastname: Nichol
authors.forename: Eugene A
authors.initials: EA
authors.lastname: Mash