C-H-CENTER-DOT-CENTER-DOT-CENTER-DOT-O HYDROGEN-BONDED MULTIPOINT RECOGNITION IN MOLECULAR ASSEMBLIES OF DIBENZYLIDENE KETONES AND 1,3,5-TRINITROBENZENES

Dibenzylideneacetone 1a, 2,5-dibenzylidenecyclopentanone 1b, 2,6-diben zylidenecyclohexanone 1c and 2,5-dibenzylidenecyclopent-3-enone 1d for m crystalline stoichiometric complexes with 1,3,5-trinitrobenzene 2a, picryl chloride 1b and picric acid 2c. The structures of these complex es are mediated by multi-point C-H ... O hydrogen bonds. Some of these patterns of molecular recognition also contain stronger O-H ... O hyd rogen bonds. The C-H ... O hydrogen bonds within these multi-point sup ramolecular synthons are generally shorter and more linear than the ot her C-H ... O hydrogen bonds found in these complexes.