Syntheses,structures,photochromic and photocatalytic properties of two viologen-polyoxometalate hybrid materials
Two new viologen-polyoxometalate hybrid crystalline materials:(MV)2[HPWⅤ2WⅥ10O40]·2H2O(1)and(EV)2[Mo8O26](2)have been synthesized by using the cations of 1,1'-dimethyl-4,4'-bipyridinium dichloride(methyl viologen,MV)and 1,1'-diethyl-4,4'-bipyridinium dibromide(ethyl viologen,EV)as the electron acceptors,and the electron-rich polyoxometalate anions as the electron donors.The structures of compounds 1 and 2 have been deter-mined by single-crystal X-ray crystallography.Hydrogen bond interactions exist between the cations and the anions in 1 and 2.Interestingly,2 has a photochromic performance with a light response time within 1 min.The photochro-mic mechanism of compound 2 has been investigated by solid-state diffuse reflection,electron paramagnetic reso-nance and theoretical calculation.1 and 2 show good catalytic performance in the photocatalytic degradation of sev-eral organic dyes(methylene blue,pararosaniline hydrochloride and rhodamine 6G).CCDC:2252398,1;2252396,2.
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