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Brucinium 2-carb­oxy-6-nitro­phthalate dihydrate: the 1:1 proton-transfer compound of brucine with 3-nitro­phthalic acid

✍ Scribed by Smith, Graham ;Wermuth, Urs D. ;Young, David J. ;Healy, Peter C.

Publisher
International Union of Crystallography
Year
2005
Tongue
English
Weight
280 KB
Volume
61
Category
Article
ISSN
1600-5368

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✦ Synopsis

In the title compound (systematic name: 2,3-dimethoxy-10oxostrychnidinium 2-carboxy-6-nitrophthalate dihydrate), C 23 H 27 N 2 O 4 + ÁC 8 H 4 NO 6 À Á2H 2 O, the carboxylic acid and carboxylate groups of the hydrogenphthalate anions form head-to-tail catemeric chains of strong intermolecular O-HÁ Á ÁO hydrogen bonds [OÁ Á ÁO distance = 2.563 (5) A ˚] along the 2 1 screw axes parallel to the a axis. The chains further associate with the water molecules, forming sheet structures parallel to (010). The protonated N atom at the 19-position of the brucine molecule forms a peripheral intermolecular hydrogen bond with the carboxylate group of the anion.

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