ELECTRON-PARAMAGNETIC-RESONANCE STUDY OF 5-COORDINATED CU2+ ETHYLENEDIAMMONIUM COPPER(II) DIPHOSPHATE MONOHYDRATE

The results of an electron paramagnetic resonance study of a new produ ct, namely ethylenediammonium copper(II) diphosphate monohydrate of ch emical formula Cu(NH3(CH2)(2)NH3)P2O7 . H2O, are presented. The x-ray diffraction has shown the existence of two types of copper(II) coordin ation polyhedron for each elementary mesh in this compound. Each polyh edron consists of a copper ion surrounded by five oxygenated ligands s toning from two P2O7 groups and a water molecule. Fair agreement betwe en these results and those obtained by x-ray diffraction is observed. In particular the organization of oxygen atoms as pyramids with a squa re plane around the copper(II) ions is confirmed. The existence of two magnetically non-equivalent sites of copper per mesh is evidenced.