A series of C-Shaped heterometallic Diruthenium(II,III) phosphates: NH4[{M(H2O)5}2Ru2(HPO4)2(PO4)2(H2O)2]·4H2O (M = Mg, Co, Ni and Zn)

Abstract

A series of heterometallic diruthenium(II,III) phosphates, namely NH4[{M(H2O)5}2Ru2(HPO4)2(PO4)2(H2O)2]·4H2O [M = Mg(1), Co(2), Ni(3) and Zn(4)], were synthesized from reaction of Ru2(PO4)47- and M2+ in aqueous solution. They are composed of ionic crystals with the [{M(H2O)5}2Ru2(HPO4)2(PO4)2(H2O)2]- : NH4+ ratio of 1:1, in which each Ru2 unit is connected in a cis manner to two octahedral environment M(H2O)52+ through phosphonate oxygen (Op) atoms forming a C-shaped ionic structure [{M(H2O)5}2Ru2(HPO4)2(PO4)2(H2O)2]-. The magnetism data fitting with the temperature dependent susceptibility χ(T,D,θ,) and extensional Brillouin function M(H,D,θ) equations convinces that the protonated HPO4 bridges between Ru2(II,III) dimer and M(II) ions mediate ferromagnetic coupling.