Syntheses, Structures and Magnetic Properties of Dinuclear Copper(II)–Lanthanide(III) Complexes Bridged by 2-Hydroxymethyl-1-methylimidazole

✍ Scribed by Wei-Xiong Zhang; Yang-Yi Yang; Shao-Bo Zai; Seik Weng Ng; Xiao-Ming Chen

• Publisher: John Wiley and Sons
• Year: 2008
• Tongue: English
• Weight: 235 KB
• Volume: 2008
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/ejic.200701041

✦ Synopsis

Abstract

Three discrete dinuclear copper(II)–lanthanide(III) complexes, namely, [CuLn(mmi)~2~(NO~3~)~3~(H~2~O)~2~] [Ln = La (1), Sm (2)] and [CuGd(mmi)~2~(NO~3~)~2~(H~2~O)~3~][NO~3~] (3) (Hmmi = 2‐hydroxymethyl‐1‐methylimidazole) were synthesized and structurally characterized by X‐ray diffraction analysis. In these complexes, dinuclear cores of Cu^II^ and Ln^III^ are consolidated by a pair of μ‐1,1‐O bridges from mmi at a distance of 3.36–3.46 Å. The temperature dependence of the magnetic susceptibility and the field dependence of the magnetization indicate that 1, 2 and 3 exhibit paramagnetic, antiferromagnetic and ferromagnetic behaviours, respectively. The value of the J~Cu–Gd~ coupling constant of 3 [8.7(1) cm^–1^] is fairly large, which is probably related to the small dihedral angles, α (5.0^°^), between the two planes of O–Cu–O and O–Gd–O in the CuO~2~Gd core.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)