Abstract
Two Keggin-type polyoxometalates ([H3PW12O40] and [H4SiW12O40]) reveal different behavior toward Bi3+ solvated by N,N-dimethylformamide (DMF): less negatively charged tungstophosphate forms double complex salt [Bi(DMF)8][PW12O40] (1), while tungstosilicate produces a molecular complex [Bi(DMF)7(HSiW12O40)]·1.7DMF·1.25H2O (2a), where POM is coordinated to Bi3+ via one of its terminal oxygen atoms. This difference in coordination can be due to different charge densities of the polyoxoanions.
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