Molybdenum catecholates as models for Mo in biological systems. 1. Synthesis and spectroscopic study on Mo complexes with 3,4-dihydroxybenzoic and 3,4-dihydroxyphenylacetic acid

Mo(VI) complexes of the ligands 3,4-dihydroxybenzoic acid (3,4-DHBA), protocatechuate (PCA) and 3,4-dihydroxyphenylacetic acid (3,4-DHPA) or DOPAC were formed in aqueous solutions using (NH 4) 2MoO 4 as starting material. Oligomeric complexes were isolated from the solutions as solids, and they were...

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Bibliographic Details
Published in:Journal of inorganic biochemistry 1998-02, Vol.69 (1), p.79-90
Main Authors: Karaliota, A, Kamariotaki, M, Hadjipanagioti, D, Aletras, V
Format: Article
Language:English
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Summary:Mo(VI) complexes of the ligands 3,4-dihydroxybenzoic acid (3,4-DHBA), protocatechuate (PCA) and 3,4-dihydroxyphenylacetic acid (3,4-DHPA) or DOPAC were formed in aqueous solutions using (NH 4) 2MoO 4 as starting material. Oligomeric complexes were isolated from the solutions as solids, and they were studied via Infrared (IR) and Raman spectroscopies as well as thermogravimetric analysis, in the solid state and in solution via Electrospray Mass Spectra (ESMS) and UV–Vis, Electron Spin Resonance (ESR) and Nuclear Magnetic Resonance (NMR) spectroscopies methods. The ligands were coordinated as catechol and/or semiquinone with the metal. All complexes were found to contain the cis-(MoO 2) group, being stable in the presence of air in the solid state. The proposed complex structures are in agreement with all experimental data.
ISSN:0162-0134
1873-3344
DOI:10.1016/S0162-0134(97)10022-8