SYNTHESIS AND CHARACTERIZATION OF TRANSITION METAL-VITAMIN B13 COMPLEXES MIXED WITH A CO-VITAMIN

摘要

The synthesis and structural characterization of mixed vitamin-metal complexes are reported. A complex bearing two vitamins (B3 and B13) on the same metal centre, nicotinamide(orotato)nickel(ll) pentahydrate, has been prepared and characterised by single-crystal X-ray diffraction methods. A complex of Cr(lII) with vitamins C and B13, bis(ascorbato)orotatochromium(HI) dihydrate, has been isolated and its nature investigated by means IR, CNMR, API-ES and thermogravimetric measurements. Theoretical calculations have been performed to propose a structure in accord with results obtained.