Two Ni/Co-substituted sandwich-type germanomolybdates based on an unprecedented trivacant polyanion [α-GeMo10O36]8.

Two Ni/Co-substituted sandwich-type germanomolybdates, {[M3(NH2-trz)6(H2O)6][M4(H2O)2(HGeMo10O36)2]}·nH2O (M = Ni2+ (1) and Co2+ (2), n = 10 (1) or 11 (2), NH2-trz = 4-amino-1,2,4-triazole), have been obtained under hydrothermal conditions. 1 and 2 represent the first trivacant Keggin germanomolybdates involving unprecedented [α-GeMo10O36]8- fragments and {M3O4} quasi-cubane building units. Both of them exhibit electrocatalytic behaviours for H2O2 reduction and photocatalytic properties for CO2 conversion.