Acta Crystallographica Section C

Crystal Structure Communications

Volume 61, Part 7 (July 2005)

organic compounds

 

The proton-transfer compounds of strychnine with achiral salicylic acids: strychninium 3,5-dinitrosalicylate and the strychninium 5-nitrosalicylate bis(5-nitrosalicylic acid) adduct

G. Smith, U. D. Wermuth and J. M. White

Abstract: In the crystal structures of the proton-transfer compounds of strychnine with 3,5-dinitrosalicylic acid, namely strychninium 3,5-dinitrosalicylate, C₂₁H₂₃N₂O₂⁺·C₇H₃N₂O₇^-, (I), and 5-nitrosalicylic acid, namely strychninium-5-nitrosalicylate-5-nitrosalicylic acid (1/1/2), C₂₁H₂₃N₂O₂⁺·C₇H₄NO₅^-·2C₇H₅NO₅, (II), protonation of one of the N atoms of the strychnine molecule occurs and this group is subsequently involved in intermolecular hydrogen-bonding interactions. In (I), this is four-centred, the primary being with an adjacent strychninium carbonyl O-atom acceptor in a side-to-side interaction giving linear chains. Other interactions are with the phenolate and nitro O-atom acceptors of the anionic species, resulting in a one-dimensional polymer structure. In (II), the N⁺-H interaction is three-centred, the hydrogen bonding involving carboxyl O-atom acceptors of the anion and both acid adduct species, giving unique discrete hetero-tetramer units. The structure of (II) also features -bonding interactions between the two acid adduct molecules.

Formula: C₂₁H₂₃N₂O₂⁺·C₇H₃N₂O₇^- and C₂₁H₂₃N₂O₂⁺·C₇H₄NO₅^-·2C₇H₅NO₅

	Structure factor file (CIF format) (175.3 kbytes) Contains datablock I
	Structure factor file (CIF format) (185.2 kbytes) Contains datablock II

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