Synthesis and magnetism of rare earth (Nd, Gd, Dy, Ho, Er, Y) pentafluoropropionate binuclear complexes with 2‐(4'‐methoxy‐phenyl)‐4,4,5,5‐tetramethylimidazoline‐1‐oxyl‐3‐oxide

Six compounds of the general formula [Ln(pfpr) 3 ] 2 (NITPhOMe)·nH 2 O, where LnNd, Gd, Dy, Ho, Er, Y, pfpr=pentafluoropropionate, NITPhOMe=2‐(4'‐methoxyphenyl)‐4,4,5, 5‐tetra‐methylimidazoline‐1‐oxyl‐3‐oxide, and n =4 (for Nd, Dy, Er); 3 (for Gd); 6 (for Ho); 5 (for Y), have been synthesized. These complexes were characterized by elemental analyses, IR, electronic spectra and molar conductances. The variable temperature (4–300 K) magnetic susceptibility of the complex [Gd(pfpr) 3 ] 2 (NITPhOMe)·3H 2 O was determined. The observed susceptibility data were fit to those from theoretical magnetic equation by least‐squares method. The exchange integral, J , was found to be equal to 2.14 cm −1 . This indicates a weak ferromagnetic spin‐exchange interaction between the radical and the gadolinium(III) ion.