Five inorganic–organic hybrids based on Keggin polyanion [SiMo12O40]4−: From 0D to 2D network

•Five new compounds based on [SiMo12O40]4− have been generated.•[SiMo12O40]4− anions play different roles in the five structures.•The electrochemical behaviors of 1, 3 and 4 have been investigated.•The photocatalysis property of 1 has been investigated.

Five new inorganic–organic hybrids based on 4,4′-bipyridine and Keggin-type polyoxometalate [SiMo12O40]4−, (SiMo12O40)(H2bipy)2·2H2O (1), [Cu(Hbipy)4(HSiMo12O40)(SiMo12O40)](H2bipy)0.5·7H2O (2), [Cu2(Hbipy)6(bipy)(SiMo12O40)3](Hbipy)2·6H2O (3), [Cu(bipy)2(SiMo12O40)](H2bipy)·2H2O (4) and [Cu2(bipy)4(H2O)4](SiMo12O40)·13H2O (5) (bipy=4,4′-bipyridine), have been hydrothermally synthesized. 1 consists of H2bipy2+ and [SiMo12O40]4− units. In 2, two [SiMo12O40]4− are bridged by [Cu(Hbipy)4]6+ to form a [Cu(Hbipy)4(SiMo12O40)2]2− dimmer. In 3, [SiMo12O40]4− polyanions acting as bidentated bridging ligands and monodentated auxiliary ligands connect [Cu2(Hbipy)6(bipy)]8+ units into a 1D zigzag chain. In 4, [SiMo12O40]4− polyanions bridge neighboring 1D [Cu(bipy)2]2+ double chains into a 2D extended layer. In 5, [SiMo12O40]4− polyanions acting as templates site alternately upon the grids from both sides of the square grid [Cu2(bipy)4(H2O)4]4+ layer. In addition, the electrochemical behaviors of 1, 3 and 4 and the photocatalysis property of 1 have been investigated.

Graphical abstractFive new compounds based on [SiMo12O40]4− have been successfully generated. [SiMo12O40]4− anions play different roles in the structures of the five compounds.Figure optionsDownload full-size imageDownload as PowerPoint slide