Syntheses, structures, and magnetic properties of acetate-bridged lanthanide complexes based on a tripodal oxygen ligand.

Four homodinuclear lanthanide complexes, Dy (L)(OAc) (), Tb (L)(OAc) (), Ho(L)(OAc) (), and Gd (L)(OAc) (), have been synthesized and characterized based on a tripodal oxygen ligand Na [(η-CH)Co(P(O)(OCH))] (NaL). Structural analyses show that the acetate anions bridge two symmetry-related Ln ions in the μ:η:η and μ:η:η coordination patterns, and each lanthanide (III) ion owns a twisted square antiprism (SAPR) conformation. Static magnetic measurements reveal the weak intramolecular ferromagnetic interaction between dysprosium (III) ions in and antiferromagnetic Ln···Ln couplings in the other three complexes. Through the analysis of the ligand-field effect and magnetic anisotropy axis orientation, the reasons for the lack of dynamic magnetic behavior in were identified.