A water-soluble mixed-valent {Mn11} cluster embedded heteropolyoxoniobate with magnetic properties

Abstract

A rare all-inorganic high-nuclearity mixed-valent {Mn₁₁} cluster embedded polyoxoniobate, K₂₅H₄₃{(Te₄Nb₉O₃₃)₃(Nb₆O₁₉)₅(Te^VINb₅O₁₄)[(Te^IVO₃)₂(Mn^II₇Mn^III₄O₁₉)]}·97H₂O (1), has been synthesized by a one-pot reaction. Compound 1 contains the largest manganese cluster {Mn₁₁} core among polyoxoniobates reported to date. {Mn₁₁} consists of three quasi-cubane {Mn₃O₄} units and is simultaneously encapsulated by lacunary α-Keggin {Te₄Nb₉O₃₆} and Lindqvist {Nb₆O₁₉} units. Compound 1 exhibits significant magnetic anisotropy and excellent water solubility and stability. The findings suggest a new, all-inorganic polynulear Mn-based structural paradigm for aqueous solution chemistry and magnetic materials.