Influence of quadrupolar interactions on the crystal packing of organic compounds: the pentafluorophenyl ester of a tricyclic α,β-unsaturated-γ-amino acid
作者:Enrique Mann、José Mahı́a、Miguel A. Maestro、Bernardo Herradón
DOI:10.1016/s0022-2860(02)00351-4
日期:2002.10
The single crystal X-ray diffraction structure of (-)-pentafluorophenyl(Z,S,S)-2-(6-oxo-1,3,4,6,11,11a-hexahydro-2H-pyrido[1,2-b]isoquinolin-11-yliden)acetate (1) is reported. We have found that the crystal packing of the alpha,beta-unsaturated-gamma-amino acid derivative I is mainly determined by the interaction between the two aromatic rings, namely the benzenic type and the pentafluorinated ring. The crystal packing of 1 shows a herringbone (zig-zag) structure, that is quite typical of aromatic compound with intermolecular arene-arene interactions. The benzenic and the fluorinated phenyl rings in 1 are in a matched face-to-face arrangement. The origin of this interaction can be ascribed to a favourably quadrupolar interaction between both types of aromatic ring. The results reported in the present paper indicate that the pentafluorophenyl ester functionality can be a useful building block in crystal engineering. (C) 2002 Elsevier Science B.V. All rights reserved.