Abstract
Cu
II complexes with Schiff base ligands as a mono- (
L
2
) and bis- (
L
1
) -condensation products of 2-pyridinecarboxaldehyde-
N-oxide with diethylenetriamine with perchlorate and chloride counter anions were prepared. Two methods of preparation of Cu
II complex containing ligand
L
2
are reported. Crystal structure of [Cu
L
2(ClO
4)(H
2O)](ClO
4) was solved. Chloride Cu
II complexes with ligand
L
1
are formed in the ratio metal:ligand 1:1 and 2:1. The presence of the ligand
L
1
in these complexes does not depend on the excess of Cu
II ions contrary to perchlorate complexes where the presence of the ligand
L
1
or
L
2
is dependent on the amount of Cu
II ions. By EPR measurements an exchange interactions were detected in Cu
L
1(ClO
4)
2·MeOH, Cu
L
2(ClO
4)
2·0.25EtOH and Cu
2
L
1Cl
4·2H
2O. Amorphous character of all three complexes was detected by X-ray powder diffraction.
Crystal structure of [Cu
L
2(ClO
4)(H
2O)](ClO
4) (
L
2
=mono-condensation product of 2-pyridinecarboxaldehyde-
N-oxide with diethylenetriamine) was solved. Chloride Cu
II complexes with ligand
L
1
(bis-condensation product) are formed in the ratio metal:ligand 1:1 and 2:1. Formation of the ligand
L
1
in chloride complexes does not depend on the excess of Cu
II ions contrary to perchlorate complexes.