Fluoride-Bridged {Gd~(III)3M~(III)2} (M = Cr, Fe, Ga) Molecular Magnetic Refrigerants

摘要

The reaction of fac-[M~(III)F3(Me3tacn)]·xH2O with Gd(NO3)3·5H2O affords a series of fluoride-bridged, trigonal bipyramidal {Gd~(III)3M~(III)2} (M=Cr (1), Fe (2), Ga (3)) complexes without signs of concomitant GdF3 formation, thereby demonstrating the applicability even of labile fluoride-complexes as precursors for 3d-4f systems. Molecular geometry enforces weak exchange interactions, which is rationalized computationally.