Crystal structure, spectroscopic and magnetic studies, and antio×idative properties of catena-[diaqua(dihydro-orotato)manganese(II)]

The polynuclear manganese(II) complex of L-dihydroorotic acid has been synthesized and characterized by X-ray crystallography, UV-visible spectroscopy, and magnetic susceptibility measurements. Crystal data: triclinic, space group P (1) over bar, a = 4.7239(5) Angstrom, b = 7.902(1) Angstrom, c = 10.552(2) Angstrom, alpha = 105.80(1)degrees, beta = 98.864(7)degrees, gamma = 104.69(1)degrees, V = 355.9(1) Angstrom(3), Z = 1, R = 0.035, Rw = 0.028. This complex consists of polymer chains of manganese atoms that are bound together via carboxylate bridges with a Mn ... Mn distance in the chain of 4.724 Angstrom. The radical scavenging properties of the complex have been evaluated by ESR spectroscopy and cyclic voltammetry methods and compared to those of vitamin E and BHT (2,6-di-tert-butyl-4-methylphenol).