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Abstract
The [Cu(Terpy)(pyz.)](ClO 4) 2 complex (were Terpy = 2,2′:6′,2′'-terpyridine and pyz. = pyrazine) was synthesized and characterized by means of spectral and magnetic properties. UV-visible and EPR spectra indicate a square pyramidal coordination for the copper(II) ion. Magnetic susceptibility measurements, reported in the temperature range 2–125 K, are analyzed in terms of regular and alternating Heisenberg-chain models giving 2J = −4.4 K, g = 2.19 (regular chain) and 2J = −5.6 K, 2J′ = −1.7 K, g = 2.15 (alternating chain). The better agreement obtained with the alternating-chain model allows us to propose a dimerized zig-zag chain structure with the pyz. ligand bridging the copper(II) ions.
Published Version
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