The preparation and crystal structure of acetatobis(L-arginine)zinc(II) acetate trihydrate, the first reported X-ray structure of a zinc(II)-arginine complex

The synthesis and X-ray crystal structure of acetatobis(L-arginine) zinc(II) acetate trihydrate, [Zn(OAc)(L-Arg)(2)]OAc center dot 3H(2)O is reported. In this structure, the first of a zinc(II)-arginine complex to be reported, the geometry around zinc(II) is distorted square-pyramidal containing two trans-N,O chelated L-Arg ligands in the basal plane and the acetato ligand in an axial position. The structure contains a second acetate which is salt-bridged to the delta and omega NH groups of the guanidinium side chain of an arginine ligand and also contains three hydrogen bonded water molecules. (C) 2011 Elsevier B.V. All rights reserved.