Syntheses and characterization of ANi(AsF6)3 (AÂ =Â H3O+, O2+, NO+, NH4+, K+, Rb+, and Cs+) compounds

ANi(AsF6)3 (A = H3O+, O2+, NO+, NH4+, K+, Rb+, Cs+) compounds are structurally related to previously known H3OCo(AsF6)3.