Abstract
Molecules of the title compound, 3,3'-[4-(4-nitrophenyl-diazenyl)phenylimino]dipropionic acid, C 18 H 18 N 4 O 6 , a model compound of second-order non-linear optically active polymers, form helicoidal rows via hydrogen bonding between carboxy groups. Pairs of helices are wrapped around the common axis in a double-helix arrangement unprecedented in dicarboxylic acids. The lateral packing of the helices shows an interdigitated antiparallel arrangement of the chromophore units.
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