Through-bond magnetic interaction between the 2p spin of the aminoxyl radical and the 3d spin of the metal ions in the complexes of bis(hexafluoroacetylacetonato)-manganese(II) and -copper(II) with 4-(N-tert-butyl-N-oxylamino)-2,2′-bipyridine

Abstract

The crystal and molecular structures of 1∶1 complexes of bis(hexafluoroacetylacetonato)-manganese(II), -copper(II) and -zinc(II) with 4-(N-tert-butylaminoxyl)-2,2′-bipyridine were studied by X-ray single crystal analyses to show their mononuclear structures in which the bipyridine moieties are coordinated with the metal ions in a cis configuration and the aminoxyl groups do not take part in the coordination. Their magnetic properties measured on a SQUID susceptometer/magnetometer revealed that the manganese(II) and copper(II) ions couple with the remote aminoxyl radical through the bipyridine ring antiferro- and ferro-magnetically by J/k_B = −20.2 and +68.7 K, respectively.