A {Ru(C<sub>6</sub>H<sub>6</sub>)}-Containing Isopolymolybdate with Good Photocatalytic Activity for Oxidative Coupling of Amines, and Proton Conduction Properties
Wei Tang, Weixia Shi, Yuting Wang, Yuzhen Jin, Pengtao Ma, Jingping Wang, Jingyang Niu
Abstract
We present a nonclassical {Ru(C 6 H 6 )}-containing isopolymolybdate Cs 8 K 2 Na 2 H 4 {[(C 6 H 6 )Ru] 6 Mo 24 O 86 }·35H 2 O ( 1 ) via one-pot reaction. The crystallographic characterization of compound 1 revealed that it contains an unusual {Mo 24 O 86 } cluster together with six {Ru(C 6 H 6 )} groups, having the largest number of {Ru(C 6 H 6 )} groups within the field of {Ru(C 6 H 6 )}-containing polyoxometalates. Results showed that compound 1 displayed excellent proton conductivity (9.8 × 10 –3 S cm –1 ) at 90 °C and 95% relative humidity. Based on the calculation result of activation energy, which was more than 0.4 eV (1.47 eV), it was determined that the proton conduction process for compound 1 was in accordance with the Vehicle mechanism. More interestingly, compound 1 was exploited as a catalyst to achieve the heterogeneous oxidative coupling of amines and realized a high yield (98.9%) toward N-benzylidenebenzylamine under ambient temperature and visible light irradiation (>400 nm) and O 2 atmosphere.