INGLE CRYSTAL XRD STUDY OF 4,4′-DIPYRIDYL-p-ETHOXYBENZOIC ACID AND N,N′-DIPYRIDYLPIPERAZINE- p-ETHOXYBENZOIC ACID CO-CRYSTALS: DIRECT EVIDENCE OF H-BOND INTERACTION IN THE CORRESPONDING LIQUID-CRYSTALLINE MESOGENIC PHASES
L.-L. Lai1, L.-J. Lee2, D.-W. Luo3, Y.-H. Liu4, Y. Wang5
Keywords: bipyridine, molecular crystals, liquid crystals, neumatic, mesogenic
Pages: 1175-1178
Abstract
Supramolecular H-bonded complexes formed between p-ethoxybenzoic acid and 4,4′-dipyridyl or N,N′-dipyridylpiperazine were obtained as nematic liquid-crystalline phases. The corresponding crystals suitable for single crystal X-ray analysis were isolated and investigated. The stoichiomtery of complex 1 is (4,4′-dipyridyl)⋅2(p-ethoxybenzoic acid) and that of complex 2 is (N,N′-dipyridylpiperazine)⋅2(p-ethoxybenzoic acid). The molecular packing observed in the crystal structures investigated indicates that the mesogenic phases of the complexes are induced by H-bond interactions.
|
