Abstract
The Schiff condensation of the 2-pyridinecarboxaldehyde
N-oxide with 2-aminophenol yielded a tridentate ligand, abbreviated as Hpoxap. This ligand is a base of a series of mononuclear complexes [M(poxap)
2] and trinuclear complexes of the type [M(poxap)MX
4M(poxap)], where X is an acetate or chloro bridge. The X-ray structure of the complex [Zn(poxap)Zn(OAc)
4Zn(poxap)]·H
2O has been determined: this complex forms a pair of distortion isomers differing slightly in bond lengths and bond angles within the chromophores. The copper(II) doping gave mixed crystals suitable for the ESR spectroscopy (
g
‖=2.282,
g
⊥=2.016,
A
‖=135 G,
A
⊥=26 G). The magnetic susceptibility of an analogous [Cu(poxap)CuCl
4Cu(poxap)] trinuclear complex at low temperature indicates a slight antiferromagnetic interaction (
J
CuCu/
hc=−5.2 cm
−1,
g
Cu=2.285).