(<i>E</i>)-4-[2-(3,4,5-Trimethoxyphenyl)ethenyl]nitrobenzene and its `bridge-flipped' analogues
作者:Alain Collas、Frank Blockhuys
DOI:10.1107/s0108270111030952
日期:2011.9.15
The solid-state structures of three push-pull acceptor-pi-donor (A-pi-D)systems differing only in the nature of the pi-spacer have been determined. (E)-1-Nitro-4-[2-(3,4,5-trimethoxyphenyl)ethenyl]benzene, C17H17NO5, (I), and its 'bridge-flipped' imine analogues, (E)-3,4,5-trimethoxy-N-(4-nitrobenzylidene)aniline, C16H16N2O5, (II), and (E)-4-nitro-N-(3,4,5-trimethoxybenzylidene)aniline, C16H16N2O5, (III), display different kinds of supramolecular networks, viz. corrugated planes, a herringbone pattern and a layered structure, respectively, all with zero overall dipole moments. Only (III) crystallizes in a noncentrosymmetric space group (P2(1)2(1)2(1)) and is, therefore, a potential material for second-harmonic generation (SHG).