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We present the second example of mixed Nb/W addendum based trimer, Cs12[(SiW9Nb3O38)3WO3(OH)3]·33H2O by utilizing in situ formed Keggin-type {SiW9(NbO2)3} unit as the secondary building block. The polyanion [(SiW9Nb3O38)3WO3(OH)3]12− incorporates three saturated niobium-substituted tungstosilicate {SiW9Nb3} clusters that are linked together by three Nb–O–Nb bridges and a tungsten joint. The compound has been thoroughly characterized by single crystal X-ray diffraction, UV-Vis spectroscopy, TG analysis, PXRD and FTIR spectra. In addition, the photocatalytic activities of the title compound and the two precursors A-α-Na10[SiW9O34]·23H2O and K7HNb6O19·13H2O for H2 evolution were also evaluated.

Synthesis, structure, and photocatalytic hydrogen evolution of a trimeric Nb/W addendum cluster