L-Arginine L-Aspartate

Salunke, D. M. ; Vijayan, M. (1982) L-Arginine L-Aspartate Acta Crystallographica - Section B: Structural Crystallography &Crystal Chemistry, B38 . pp. 1328-1330. ISSN 0567-7408

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Official URL: http://scripts.iucr.org/cgi-bin/paper?S05677408820...

Related URL: http://dx.doi.org/10.1107/S056774088200569X

Abstract

C6H15N4O2+.C4H6NO4-, monoclinic, P2,,a = 5.511 (3), b = 8.438 (4), c = 15.265 (9) Å , β = 97.9 (I) ° , Dm = 1.467 (8) (flotation), D c = 1.452 Mg m-3, Z = 2. The structure has been refined to a final R value of 0.044 for 1226 independent counter-measured reflections. The conformation of the arginine molecule is different from those previously observed, whereas the conformation of the aspartate ion is similar to that found in L-aspartic acid, DL-aspartic acid and L-lysine L-aspartate. The unlike molecules aggregate into separate alternating layers and the a-amino and acarboxylate groups in the arginine layer are periodically brought into close proximity in a 'headto-tail' arrangement. There exist a specific ion-pair interaction involving electrostatic attraction and two nearly parallel N-H...O hydrogen bonds between the guanidyl group and the a-carboxylate group of the aspartate ion.

Item Type:Article
Source:Copyright of this article belongs to International Union of Crystallography.
ID Code:52508
Deposited On:04 Aug 2011 07:46
Last Modified:15 Jul 2012 18:18

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