Abstract
A series of mono-nuclear rare earth-radical compounds [Ln(hfac)3(NIT-Ph-3-COOMe)2]·0.5C7H16 (LnIII = Gd(1), Tb(2), Dy(3), Ho (4)) were get by reaction of nitroxide radical NIT-Ph-3-COOMe with Ln(hfac)3·2H2O (NIT-Ph-3-COOMe=2-(3-(methoxycarbonyl)-phenyl-4,4,5,5-tetramethyl-imidazoline-1-oxyl-3-oxide; hfac=hexafluoroacetylacetonate). Each Ln(Ⅲ) ion in four complexes is an octa-coordination configuration, in which two O atoms from NO units of two NIT-Ph-3-COOMe radicals and six O atoms are derived from three hfac co-ligands. Magnetic measurements indicate that a ferromagnetic interaction between GdIII and nitroxide radicals, while magnetic coupling of two NOs transmitted by GdIII ion is antiferromagnetic. For compound 2, non-zero out-of-phase signals (χ″) were gained at 3000 Oe, confirming field-induced magnetic relaxation behavior. Furthermore, fluorescence properties of 2 were investigated, which indicated that it can be used as a highly sensitive and selective fluorescence probe of Fe3+ cation and Cr2O72− anion.
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