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

By the reactions of Cu(OAc)2 · H2O and Cu(HCOO)2 · 4H2O with 2-(aminomethyl)pyridine in different proportions, 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 · H2O (6) and Cu(HCOO)2(2-amp)2 · H2O (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 NH2 groups and O atoms yield to the formation 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, CuCl2(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 NH2 and Cl, are interpenetrated and shows π 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.

CuCl2(2-amp)2 and derivatives of Cu(OAc)2 · H2O and Cu(HCOO)2 · 4H2O with 2-(aminomethyl)pyridine have been synthesized and characterized. N–H···O and N–H···Cl hydrogen bonds are present in the chain or sheet structures. Magnetic properties and EPR spectra are also studied.Figure optionsDownload as PowerPoint slide