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

Add time:09/26/2019    Source:infona.pl

This paper describes the structure and magnetic properties of a novel cobalt 1-aminoethylidenediphosphonate compound, namely Co 3 {CH 3 C(NH 3 )(PO 3 H)(PO 3 )} 2 {CH 3 C(NH 3 )(PO 3 H) 2 } 2 (H 2 O) 4 ·2H 2 O (1). The structure contains a trimer unit of Co 3 {CH 3 C(NH 3 )(PO 3 H)(PO 3 )} 2 in which two equivalent phosphonate ligands chelate and bridge the three cobalt ions. Each trimer unit is further linked to its four equivalent neighbors through corner-sharing of CoO 6 octahedra and CPO 3 tetrahedra, forming a two-dimensional layer in the bc-plane which contains 12-membered rings. These layers are connected to each other by extensive hydrogen bonds. Magnetic studies show that weak antiferromagnetic interactions are mediated between the cobalt ions. Crystal data for 1: monoclinic, space group C2/c, a=27.727(4), b=7.1091(11), c=19.827(3)Å, β=118.488(3), V=3434.9(9)Å3, Z=2.

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