C. Djordjevic, N. Vuletić, B. A. Jacobs
Apr 23, 1997
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Journal
Inorganic Chemistry
Abstract
The compounds MoO(O2)2(α-aa)(H2O), α-aa = glycine (1), alanine (2), proline (3), valine (4), leucine (5), serine (6), asparagine (7), glutamine (8), and glutamic acid (9), were prepared from the acidic aqueous solutions and characterized by examination of their IR, 1H and 13C NMR, and UV−visible spectra. They represent the first complexes containing a peroxo−α-amino acid combination in a metal ion ligand sphere. The synthesis and crystallization of these complexes was pH and concentration dependent, and their stability varied for different α-amino acids. X-ray structural studies of 1−3 have shown that the α-amino acids are coordinated as a zwitterion via one oxygen. This oxygen of the monodentate carboxylato group occupies an equatorial position in a distorted pentagonal bipyramid and encloses the pentagonal ring with the two bidentate peroxo groups. The apical positions are occupied by an oxo group and a water molecule, respectively. The Mo−O(O2) bonds are nonsymmetrical, differing in length by 0.009−0.0...