S. Lorenzo, D. Craig, M. Scudder
Oct 22, 1999
Citations
0
Influential Citations
3
Citations
Journal
Polyhedron
Abstract
Abstract The crystal structure of methyltriphenylphosphonium dichromate [MePh3P]2[Cr2O7] is described. This compound was investigated to determine if the dichromate ion could be trapped in the hexagonal array of six-fold phenyl embraces (HA6PE) found in other [MePh3P+]2X2− compounds. Despite the energetic accessibility of three-fold symmetry in the [Cr2O7]2− ion, the HA6PE lattice type is not observed. Instead the cations occur in layers and participate in relatively weak phenyl–phenyl embraces. The principal feature of the crystal supramolecularity of [MePh3P]2[Cr2O7] is the occurrence of a pattern of C–H⋯O–Cr interactions, a previously unrecognised supramolecular motif.