Acetato, formato and chloride copper(II) complexes with 2-(aminomethyl)pyridine: Synthesis, crystal structure, magnetic properties and EPR results

摘要

By the reactions of Cu(OAc)_2 _ H_2O and Cu(HCOO)_2 _ 4H_2O with 2-(aminomethyl)pyridine in different pro_portions, the compounds Cu(OAc)_2(2-amp) (1), Cu(HCOO)_2(2-amp) (2), Cu(HCOO)_2(2-amp)_(1/2) (5), Cu(OAc)_2(2-amp)_2 _ H_2O (6) and Cu(HCOO)_2(2-amp)_2 _ H_2O (7) were obtained. In 1 the copper shows an elongated rhombic octahedral stereochemistry determined by a 2-amp molecule and two asymmetrical bidentate acetate groups. The hydrogen bonds between the NH_2 groups and O atoms yield to the forma tion of a double chain. Compound 2 instead consists in monodimensional chains of Cu(2-amp)(HCOO) units, with monodentate formate groups, linked by syn-anti bridging formate groups. Sheets are formed by hydrogen bonds between the chains. By crystallization of a solution of 6 in chloroform, CuCl_2(2-amp)_2 (3) was obtained. It presents a highly distorted square pyramidal geometry around the copper atom. The sheets, formed by the hydrogen bonds between NH_2 and Cl, are interpenetrated and shows it stacking. Magnetic properties and EPR spectra for these new compounds have been studied. Also the magnetic behaviour of Cu(OAc)_2(2-amp)_(1/2) (4) is described.