Homoleptic tris(6,6′-dimethyl-2,2′-bipyridine) rare earth metal complexes

Homoleptic tris(6,6′-dimethyl-2,2′-bipyridine) rare earth metal complexes M(κ2-dmbp)3 (M = Y, Tb, Dy, Ho, Er; dmbp = 6,6′-dimethyl-2,2′-bipyridine) were synthesized by in situ reduction of 3 equiv. of dmbp with excess KC8 in the presence of 1 equiv. of rare earth metal trihalides. All compounds were...

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Bibliographic Details
Published in:Inorganic chemistry frontiers 2021-05, Vol.8 (10), p.2591-2602
Main Authors: Xiao, Yuyuan, Sun, Rong, Liang, Jiefeng, Fang, Yuhui, Liu, Zheng, Jiang, Shangda, Wang, Bingwu, Gao, Song, Huang, Wenliang
Format: Article
Language:English
Subjects:
Anions
Antiferromagnetism
Chemical analysis
Coordination compounds
Crystallography
Density functional theory
Dysprosium
Electron paramagnetic resonance
Erbium
Ferromagnetism
Infrared analysis
Infrared spectroscopy
Inorganic chemistry
Magnetic measurement
Magnetic moments
Magnetic permeability
Magnetism
Mathematical analysis
Metal ions
Rare earth elements
Room temperature
Spectrum analysis
Yttrium
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Summary:Homoleptic tris(6,6′-dimethyl-2,2′-bipyridine) rare earth metal complexes M(κ2-dmbp)3 (M = Y, Tb, Dy, Ho, Er; dmbp = 6,6′-dimethyl-2,2′-bipyridine) were synthesized by in situ reduction of 3 equiv. of dmbp with excess KC8 in the presence of 1 equiv. of rare earth metal trihalides. All compounds were characterized by X-ray crystallography, UV-Vis-NIR spectroscopy, infrared (IR) spectroscopy, elemental analysis, and magnetic measurements. While the structural parameters and spectroscopic data confirmed the existence of the trivalent rare earth metal cation and three dmbp radical anions, the electron paramagnetic resonance (EPR) spectrum and the measured magnetic moment of Y(κ2-dmbp)3 indicated that two parallel dmbp radical anions were antiferromagnetically coupled. For paramagnetic rare earth metal ions, room temperature magnetic susceptibility values indicated a weak ferromagnetic interaction between the metal ion and the remaining dmbp radical. Density functional theory (DFT) calculations were performed on Y(κ2-dmbp)3 to gain insight into the electronic structures of these homoleptic metal complexes. The computational results were consistent with the structural, spectroscopic, and magnetic data for a S = 1/2 ground state and spin densities mostly residing on one dmbp radical anion, while the spins on the other two parallel dmbp radical anions being antiferromagnetically coupled.
ISSN:2052-1545
2052-1553
DOI:10.1039/d1qi00240f