Double-helix pattern in a model compound of non-linear optical polymers

R Centore, A Carella, A Pugliese, A Sirigu…

Index: Centore, Roberto; Carella, Antonio; Pugliese, Andrea; Sirigu, Augusto; Tuzi, Angela Acta Crystallographica Section C: Crystal Structure Communications, 2006 , vol. 62, # 8 p. o531-o533

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Citation Number: 4

Abstract

Molecules of the title compound, 3, 3′-[4-(4-nitrophenyldiazenyl) phenylimino] dipropionic acid, C18H18N4O6, 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 ...