Two novel Dawson-like tungstoantimonates with difunctional photocatalytic and magnetic properties

Abstract

Two novel inorganic–organic hybrids containing the pyramidal SbO₃ group in Dawson-like POMs based on an organic ligand with different coordination modes, namely {Ni(phen)₃}₃[SbW₁₈O₆₀]·(H₃O)₃·7H₂O (1) and [Cu^I(phen)(H₂O)₃]{[Cu^II₂(phen)₂(H₂O)₂]₂[SbW₁₈O₆₀]}·2H₂O (2) (phen = 1,10-phenanthroline), have been synthesized. The catalytic property of compound 1 was studied as the first case for an {M₁₈} cluster containing the pyramidal SbO₃ group. Remarkably, compound 1 has excellent photocatalytic activity for RhB degradation and the probable mechanism of degradation was discussed. Additionally, the 2D-IR correlation spectra (2D-IR COS) under magnetic perturbation were recorded to analyze the magnetic properties of compound 1. The 2D-IR COS under thermo perturbation were recorded to verify the presence of H-bonding interactions.