cg0340751_si_004.cif (24.92 kB)

Organic Crystal Engineering with Piperazine-2,5-diones. 4. Crystal Packing of Piperazinediones Derived from 2-Amino-7-cyano-4-methoxyindan-2-carboxylic Acid

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posted on 14.08.2003, 00:00 by Bhumasamudram Jagadish, Michael D. Carducci, Christian Bosshard, Peter Günter, Jason I. Margolis, Lawrence J. Williams, Eugene A. Mash
Piperazine-2,5-diones derived from 2-amino-7-cyano-4-methoxyindan-2-carboxylic acid were prepared in meso, racemic, and enantiomerically pure forms, crystallized from dimethyl sulfoxide (DMSO), and the supramolecular organization in the crystals determined by X-ray crystallography. These molecules were designed to bear two strongly polar p-methoxybenzonitrile moieties either aligned or opposed. In contrast with nonpolar or weakly polar piperazinediones of similar size and shape, which exclude DMSO to form ladder-like tapes by reciprocal intermolecular amide-to-amide hydrogen bonding, these more strongly polar piperazinediones participate in hydrogen bonding with included DMSO. In cocrystals of the enantiomerically pure compounds, the p-methoxybenzonitrile dipoles were aligned in the three-dimensional lattice but opposed by the dipoles of included DMSO. These cocrystals exhibited second harmonic properties comparable to urea. A second cocrystal possessing aligned p-methoxybenzonitrile dipoles was observed when the enantiomerically pure compound was crystallized from dipropylsulfoxide. Compensating dipropylsulfoxide dipoles were absent in this cocrystal.