High-valent manganese in polyoxotungstates-1. Manganese(IV) keggin derivatives

摘要: Abstract Aqueous and non-aqueous soluble salts of manganese(IV)-containing Keggin polyoxotungstates [(XO 4 )W 11 Mn IV O 36 H x ] n − (X  Si, B, Zn) have been prepared by chemical electrolytic oxidation corresponding manganese(II) or manganese(III) anions, characterized magnetic susceptibilities, ESR X-ray absorption near-edge spectroscopy (XANES), in addition to conventional elemental spectroscopic analyses. The crystal structure dark brown K 7 [(ZnO H] · 19H 2 ( I ) was determined diffraction reveals a disordered anion. Manganese EXAFS investigation the complex, which contains terminal II OH group, strongly indicates that r O ≈ 1.82 A) rather than O.