Coordination of CU(II) with morpholine derivative - structural and vibrational properties

Two new copper(II) complexes with general formula [Cu(etMorph)2ox] and [Cu2(etMorph)4ox](NO3)2, where etMorph = 4-(2-aminoethyl)morpholine, ox = oxalate, have been prepared by reacting Cu(NO3)2 3H2O with K2C2O4 H2O and etMorph in an aqueous solution in molar ratio 1 : 2 : 2, respectively. Solid crystal products were characterised by spectroscopic methods. Their crystal structures have not yet been determined, but on the basis of vibrational (FT-IR) spectral studies as well as quantum-chemical calculations we propose a possible geometry of the complexes.