Spectroscopic and magnetic properties of Cu2(terpy)Cl4(terpy = 2,2′ : 6′,2″-terpyridine). A magnetic system constructed of two exchange-coupled dimers

Abstract

The complex Cu₂(terpy)Cl₄(terpy = 2,2′:6′,2″-terpyridine) has been prepared and characterized through spectroscopic and magnetic properties. The results emphasize the presence of two dimeric moieties, identified as [{Cu(terpy)Cl}₂]²⁺ and [Cu₂Cl₆]^2–. Magnetic susceptibility data show that both dimers are antiferromagnetically coupled, with J₁=–1.2 and J₂=–54.3 cm^–1, giving a satisfactory explanation for the thermal evolution of the e.s.r. spectra. These results are compared with those for similar entities and structural predictions are discussed.