Co3{CH3C(NH3)(PO3H)(PO3)}2 {CH3C(NH3)(PO3H)2}2(H2O)4·2H2O: A cobalt 1-aminoethylidenediphosphonate with a layer structure

Compound Co3{CH3C(NH3)(PO3H)(PO3)}2{CH3C(NH3)(PO3H)2}2(H2O)4·2H2O with a unique layer structure containing 12-membered rings is reported. It shows weak antiferromagnetic interactions between the Co(II) ions.