Crystal Structure of [Bis(L-Alaninato)Diaqua]Nickel(II) Dihydrate

Introduction Complexes formed by metal cations and organic species are incorporated in many biochemical structures, such as cytochromes of mitochondrial membranes, hemoglobin, and chlorophyll. Transition metal complexes with Schi-base ligand containing the carboxylate group have been of great interest due to their importance as essentially biologically active [1-3] models for metalloproteins [4] and their various geometry aspects [5]. Metals bound to amino acids are essential for the catalytic function of certain enzymes, and their chemistry has received a great deal of research interest due to their signicant interaction with enzymes and withdifferent organic ligands which enables a better understanding of the antitumor/viral activities of this class of compounds and for modeling substrates involved in enzyme inhibition [6, 7]. A number of complexes of amino acids with many transition metal ions have been prepared and thoroughly studied [8-14]. A complex of alanine with nickel(II) was reported [15] and described as a neutral bis(alaninato) diaqua nickel(II), and its X-ray crystal structure seems not to have been explicitly studied. erefore, it was considered worthwhile and of great signicant chemical interest to synthesize this complex and to study thoroughly its crystal structure in order to get greater depth into its composition.