Two novel nickel cluster substituted polyoxometalates: syntheses, structures and their photocatalytic activities, magnetic behaviors, and proton conduction properties

Two novel nickel cluster substituted polyoxometalates (POMs), H7Na19(H2O)(26){Ni-12(OH)(9)(PO4)(4)(A-alpha-SiW9O34)(W4O10(OH)(PO2(OH)(2))(2)(A-alpha-SiW9O34)(2))}center dot 4C(2)H(8)N center dot 27H(2)O (1) and H26.6K2.5Na(H2O)(16)(Ni-6(OH) (BO3)(2)(dien)(2)(B-alpha-SiM10O37)(2)](2)center dot 24H(2)O (2) (dien = diethylenetriamine), have been successfully prepared. 1 is a Ni-12-substituted POM comprised of a novel (Ni-12(OH)(9)(PO4)(4)) core, an A-alpha-(SiW9O34) unit and an uncommon (W4O10(OH)(9)O-7(OH)(2))(7 )(A-alpha-SiW9O34)(2)) fragment. 2 is a Nib-substituted sandwich-type POM constructed from two B-alpha-(SiW10O37) units and an unusual boat-like (Ni-6(OH)(BO3)(2)(dien)(2)} cluster. Photocatalytic study reveals that 2 shows a moderate catalytic activity in visible-light-driven CO2 reduction reactions. Additionally, the magnetic behaviors and the proton conduction performances of the compounds were investigated.

Automated summary

Two novel nickel cluster substituted polyoxometalates (POMs) have been successfully prepared, with one showing moderate catalytic activity in visible-light-driven CO2 reduction reactions. Additionally, the magnetic behaviors and proton conduction performances of the compounds were investigated.