Syntheses, structures and magnetic properties of two copper(II) diphosphonates: [NH_3(CH_2)_2NH_3]_2[Cu_2(hedp)_2](centre dot)H_2O and [NH_3CH(CH_3)CH_2NH_3]_2[Cu_2(hedp)_2] (hedp = 1-hydroxy-ethylidenediphosphonate)

摘要

This paper describes the syntheses and characterization of two new copper(II) diphosphonates: [NH_3(CH_2)_2NH_3]_2[Cu_2(hedp)_2](centre dot)H_2O (1) and [NH_3CH(CH_3)CH_2NH_3]_2[Cu_2(hedp)_2] (2) (hedp = 1-hydroxyethylidenediphosphonate). Both compounds exhibit similar one-dimensional linear chain structures. The symmetrical {Cu_2(hedp)_2} dimers are connected by edge-shared {CuO_5} sequare pyramids and form infinite chains. The Cu(II) ions are alternately bridged by O-P-O groups and O atoms. The Cu-O-Cu angles are 95.8(1) and 96.1(1) deg for 1 and 2, respectively. Their magnetic properties show moderately strong antiferromagnetic interactions in both compounds.