Crystal packing: An examination of the packing of molecules approximately isosteric with 4,5-dichlorophthalic anhydride

Doyle Britton, Wayland E. Noland, Matthew J. Pinnow, Victor G. Young

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

The crystal structures of five 5,6-disubstituted benzofurazan 1-oxides are presented and compared with five previously reported structures: three polymorphs of 5,6-dichlorobenzofurazan 1-oxide plus 4,5-dichloro- and 4,5-dibromophthalic anhydride. All but one of these compounds pack with similar two-dimensional layers. The benzofurazan oxides all show disorder about a crystallographic twofold or pseudo-twofold axis. In addition, six complexes of phthalic anhydride and benzofurazan oxides are reported. With the packing in the complexes principally directed by the π complexing, the disorder, invariably found in the uncomplexed benzofurazan oxides, is diminished, and, in two cases, eliminated.

Original languageEnglish (US)
Pages (from-to)1175-1192
Number of pages18
JournalHelvetica Chimica Acta
Volume86
Issue number4
DOIs
StatePublished - Jun 11 2003

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