Syntheses, Crystal Structures and Magnetic Properties of Two Nitrophenyl Substituted Nitronyl Nitroxide Radical-lanthanide Complexes

Syntheses, structures and magnetic properties of two nitrophenyl substituted nitronyl nitroxide radical-lanthanide complexes [Ln(hfac)(3)(NITmNO2)(2)] (Ln = Sm(III) (1), Tb(III) (2), hfac = hexafluoroacetylacetonate, NITmNO2 = 2-(3-nitrophenyl)-4,4,5,5-tetramethyl-imidazo-line1- oxyl-3-oxide) have been described in this paper. X-ray analysis shows that the two complexes have similar mononuclear trispin radical-Ln(III)-radical structures, in which the central Ln(III) ions are all eight coordinated in D-2d dodecahedral (DD) geometry formed by six oxygen atoms from three hfac and two oxygen atoms from nitronyl nitroxide. The magnetic study indicates the antiferromagnetic interaction between Sm(III) ion and NITmNO2 in complex 1, while weak ferromagnetic interaction between Tb(III) ion and NITmNO2 in complex 2.