Three Novel Rare-earth Complexes with Nitronyl Nitroxide Radical [RE(hfac)3 (NITPhOCH3)2] [RE = GdIII, YIII and ErIII]: Syntheses, Crystal Structures and Magnetic Properties

Three novel isomorphous complexes of formula [RE(hfac)^sub 3^(NITPhOCH^sub 3^)^sub 2^], where RE = Gd^sup III^, Y^sup III^ and Er^sup III^; hfac = hexafluoroacetylacetonate; NITPhOCH^sub 3^ = 4'-methoxyphenyl-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide, were synthesized, structurally and magn...

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Published in:Transition metal chemistry (Weinheim) 2006-08, Vol.31 (5), p.593-597
Main Authors: Zhao, Qi-Hua, Ma, Yong-Ping, Du, Lin, Fang, Rui-Bin
Format: Article
Language:English
Subjects:
Crystal structure
Magnetism
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Summary:Three novel isomorphous complexes of formula [RE(hfac)^sub 3^(NITPhOCH^sub 3^)^sub 2^], where RE = Gd^sup III^, Y^sup III^ and Er^sup III^; hfac = hexafluoroacetylacetonate; NITPhOCH^sub 3^ = 4'-methoxyphenyl-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide, were synthesized, structurally and magnetically characterized. The crystal structure consists of isolated molecules where the nitronyl nitroxide radicals act as monodentate ligands towards RE(III) through the oxygen atom of the N-O group. The magnetic properties of the complexes were studied by measuring their magnetic susceptibilities at various temperatures in the 5-300 K range. The analyses of these magnetic measurements showed that the spin coupling between the gadolinium ion and the radicals in the Gd^sup III^ complex is ferromagnetic, while antiferromagnetic superexchange interaction exists between the two radicals in the Gd^sup III^ and Y^sup III^ complexes. The Er^sup III^ complex reveals an overall intramolecular antiferromagnetic exchange interaction.[PUBLICATION ABSTRACT]
ISSN:0340-4285
1572-901X
DOI:10.1007/s11243-006-0032-2