Spectroscopic studies of oxygen-bridged copper(II) cluster complexes. I: Dimeric copper(II) complexes of 2-aminopyridine and pentane-2,4-dionate

Abstract X-band E.P.R and also the far infrared spectra of alkoxy-bridged dimeric copper (11) complexes of 2-aminopyridime and pentane-2, 4-dionate were recorded and the two sets of data thus obtained have been correlated. The E.P.R spectra were analysed in terms of an axial (S=1) spin Hamiltonian. Zero-field splitting parameter (D) was calculated for each complex and an attempt was made in order to correlate the obtained values with the magnetic coupling constants (J) of some compounds with analogous structures. An assignment has been made of the bands related to the central Cu202 bridging skeleton and the observed similarity in the frequency magnitude of a strongly CuOCu angle dependent mode has been proposed to arise from nearly equal angles in the seri of complexes. The correlative results indicated in the above have therefore enabled the identification of a ferromagnetic exchange mechanism in the seri of complexes with J values larger than 242.5 cm-1.

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