CRYSTAL STRUCTURE AND MAGNETIC PROPERTIES OF A NEW HETEROMETALLIC COMPLEX OF Pd(II)–Cu(II) WITH 1-AMINOETHYLIDENE-1,1-DIPHOSPHONIC ACID
A heterometallic complex of Pd(II)–Cu(II) with 1-aminoethylidene-1,1-diphosphonic (AEDP) acid (C <sub>4</sub>H <sub>22</sub>CuN <sub>2</sub>O <sub>16</sub>P <sub>4</sub>Pd) <sub>n</sub> (І) is synthesized. Single crystals of compound І are obtained; its crystal structure is determined by X-ray crystallography. The crystals are orthorhombic, space group <i>Pbcn</i>, <i>a</i> = 18.366(3) Å, <i>b</i> = 9.7661(17) Å, <i>c</i> = 20.198(4) Å, <i>V</i> = 3622.8(11) Å <sup>3</sup>, <i>Z</i> = 8, <i>d</i> <sub>x</sub> = 2.376 g/cm <sup>3</sup>. The compound crystallizes as a coordination polymer; the square environment of Pd(II) is formed by nitrogen atoms of amino groups and oxygen atoms of phosphonic groups, while at two non-equivalent copper atoms the octahedral environment is formed by oxygen atoms of phosphonic groups and water molecules. The crystal structure of compound I is characterized by the formation of a branched network of hydrogen bonds. Based on the analysis of the temperature dependence of the magnetic susceptibility it is found that for the heterometallic complex of Pd(II)–Cu(II) with AEDP antiferromagnetic interactions between the paramagnetic centers are dominant.