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Cr III -Substituted Heteropoly-16-Tungstates [Cr III 2 (B-β-X IV W 8 O 31 ) 2 ] 14- (X = Si, Ge): Magnetic, Biological, and Electrochemical Studies.

Inorganic Chemistry 2016 November 8
The dichromium(III)-containing heteropoly-16-tungstates [CrIII 2 (B-β-SiIV W8 O31 )2 ]14- (1) and [CrIII 2 (B-β-GeIV W8 O31 )2 ]14- (2) were prepared via a one-pot reaction of the composing elements in aqueous, basic medium. Polyanions 1 and 2 represent the first examples of CrIII -containing heteropolytungstates comprising the octatungstate unit {XW8 O31 } (X = Si, Ge). Magnetic studies demonstrated that, in the solid state, the two polyanions exhibit a weak antiferromagnetic interaction between the two CrIII centers with J = -3.5 ± 0.5 cm-1 , with no long-range ordering down to 1.8 K. The ground-state spin of polyanions 1 and 2 was thus deduced to be 0, but the detection of a complex set of EPR signals implies that there are thermally accessible excited states containing unpaired spins resulting from the two S =3 /2 CrIII ions. A comprehensive electrochemistry study on 1 and 2 in solution was performed, and biological tests showed that both polyanions display significant antidiabetic and anticancer activities.

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