An excellent multifunctional photocatalyst with a polyoxometalate–viologen framework for CEES oxidation, Cr(vi) reduction and dye decolorization under different light regimes

{Mo 8 O 26 } clusters were first introduced into the cobalt–viologen framework to yield a novel 2D POMOF, which exhibits excellent photocatalytic performance towards CEES oxidation, Cr( vi ) reduction and dyes decolorization under different light regimes.