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Acta Cryst. (2002). E58, o1315-o1317 [ doi:10.1107/S1600536802019463 ]
Abstract: The crystal structure of the dihydrate of the 1:1 proton-transfer compound of 3,5-dinitrosalicylic acid with 2-hydroxybenzaldehyde oxime (salicylaldoxime), C7H8NO2+·C7H3N2O7-·2H2O, is a three-dimensional hydrogen-bonded polymer. In this, the oxime-N atom of salicylaldoxime is protonated and, together with the adjacent O-H group, gives primary cyclic asymmetric hydrogen-bonding associations with both carboxyl O atoms of the acid. These, together with hydrogen-bonding interactions among all species present, including the two water molecules, give an essentially planar ten-membered ring. Peripheral hydrogen bonding also links the water molecules to carboxyl and nitro-O atoms, giving rise to a three-dimensional polymer structure.
Online 31 October 2002
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