Abstract
A novel transition-metal (TM) complex based on Lindqvist polyoxoniobate K10[(Nb6O19)CrIII(H2O)2]2·28H2O (1) has been synthesized by a new two-pot synthesis strategy and structurally characterized by single crystal X-ray diffraction analysis, IR spectrum, UV–vis spectroscopy, XRPD and TG analysis. Compound 1 crystallizes in the C2/m space group with a=32.143(19) Å, b=10.030(6) Å, c=12.878(8) Å, β=110.611(9)°, and V=3886(4) Å3. X-ray structure analysis reveals that polyanion [(Nb6O19)CrIII(H2O)2]210− (1a) represents the first example of two nuclear dimeric polyoxoniobate, in which two Lindqvist anions [Nb6O19]8 are sandwiched by two {CrIII(H2O)2} groups. Further, 1 exhibits photocatalytic H2 evolution activity.
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