Synthesis and spectroscopic, magnetic and EPR studies of di-μ-hydroxo-bis[(NN)( N-phenyl-2-pyridinamine)copper(II)]hexaflourophosphate, with NN=2,2′-bipyridine or 1,10-phenanthroline. : X-ray crystal structure of the 2,2′-bipyridine complex

Abstract

Binuclear complexes [{Cu(NN)(PhNHpy)} 2(μ-OH) 2](PF 6) 2, where NN=2,2′-bipyridine (bipy) or 1,10-phenanthroline (phen), have been synthesized and characterized by chemical analysis, conductance measurements and IR and electronic spectroscopy. The X-ray crystal structure of [{Cu(bipy)(PhNHpy)} 2(μ-OH) 2](PF 6) 2 shows a distorted square-planar pyramidal coordination for Cu(II), defined by two nitrogen atoms of bipy, two bridging oxygen atoms and the pyridinic nitrogen atom of the ligand. Magnetic susceptibility measurements (in the 4.8–290 K range) reveal coupling which is antiferromagnetic for the bipy complex (2 J=−24.2 cm −1) and slightly ferromagnetic for the phen complex (2 J=3.3 cm −1). The EPR spectra show the expected triplet signals.