X-RAY STUDIES ON CRYSTALLINE COMPLEXES INVOLVING AMINO-ACIDS AND PEPTIDES .8. HEAD-TO-TAIL ARRANGEMENT AND A SPECIFIC INTERACTION IN THE CRYSTAL-STRUCTURE OF L-ARGININE ACETATE

  • 1 January 1983
    • journal article
    • research article
    • Vol. 21  (3) , 223-226
Abstract
L-Arginine acetate crystallizes in the monoclinic space group P21 with a = 9.229(2), b = 5.178(3), c = 13.271(4) .ANG. and .beta. = 111.4(1).degree.. The crystal structure was solved by direct methods and refined to an R value of 0.058 for 1333 observed reflections. The conformation of the arginine molecules in the crystal is different from those observed in the crystals of L-arginine, its salts and complexes. The crystal structure indicates that complexation with a small carboxylic acid like acetic acid is sufficient to align arginine molecules in a head-to-tail fashion. The structure contains a specific ion-pair interaction, involving electrostatic attraction as well as 2 nearly parallel, N-H...O hydrogen bonds, between the guanidyl group and the acetate ion.

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