Spectroscopic and magnetic properties of diethyl (pyridin-4-ylmethyl)phosphate (4-pmOpe) ligand with perchlorate transition metal salts. Crystal structure of [Cu(4-pmOpe)2(ClO4)2]

The perchlorate transition metal complexes with a new class of phosphate ligand derived from pyridine, i.e. the diethyl (pyridin-4-ylmethyl)phosphate (4-pmOpe) ligand were prepared and studied. In particular, the crystal structure of [Cu(4-pmOpe)2(ClO4)2] was determined by the X-ray method. Its structure consists of a one-dimensional polymeric chain in which copper(II) ions are N,O-bridged by two 4-pmOpe organic ligands in a trans arrangement. The magnetic data indicate very weak intra- and interchain magnetic exchange interactions (J′ = −0.43 and zJ′ = 0.29 cm−1, respectively). The magnitude of weak interchain ferromagnetic interaction transmitted by weak C-H⋯O hydrogen bonds is correlated with the structural data.