Synthesis and Characterization of the First Dinuclear Europium (Ⅱ) Complex Supported by Carbon-Bridged Biphenolate Ligand
来源期刊：JOURNAL OF RARE EARTHS2006年第3期
论文作者：Deng Mingyu Zhang Yong Shen Qi Liu Bao Yao Yingming
Key words：inorganic chemistry; carbon-bridged biphenolate lanthanide complex; crystal structure; rare earths;
Abstract: Anhydrous EuCl3 reacted with sodium carbon-bridged biphenolate LNa2 [ L = 2,2'-methylene bis (6-tert-butyl-4-methyl-phenoxo] in a 1:1 molar ratio in THF in the presence of HMPA (HMPA = hexamethylphosphoric triamide), then the product formed in situ was reduced by Na-K alloy to generate the divalent carbon-bridged biphenolate europium complex [LEu(HMPA)2]2(THF)4(1) in a good isolated yield. Complex 1 was fully characterized by elemental analysis, NMR and IR spectra, and X-ray structural determination. The crystal data of complex 1 are monoclinic, P21/c space group,a = 1.6521(3) nm, b =2.8274(3) nm, c = 1.2074(2) nm, β = 111.723(6)°, V= 5.2393(14) nm3, Z = 2, Dc =1.259 mg·m-3, μ = 1.304 mm-1, F(000) = 2092, R = 0.0815, wR = 0. 1723. Complex 1 is a dimer with two Eu - O bridges. The coordination geometry of each europium atom can be best described as a distorted trigonal bipyramid.
Deng Mingyu1，Zhang Yong1，Shen Qi1，Liu Bao1，Yao Yingming1
(1.Key Laboratory of Organic Synthesis of Jiangsu Province, Department of Chemistry and Chemical Engineering, Suzhou University, Suzhou 215123, China)
Abstract:Anhydrous EuCl3 reacted with sodium carbon-bridged biphenolate LNa2 [ L = 2,2''-methylene bis (6-tert-butyl-4-methyl-phenoxo] in a 1:1 molar ratio in THF in the presence of HMPA (HMPA = hexamethylphosphoric triamide), then the product formed in situ was reduced by Na-K alloy to generate the divalent carbon-bridged biphenolate europium complex [LEu(HMPA)2]2(THF)4(1) in a good isolated yield. Complex 1 was fully characterized by elemental analysis, NMR and IR spectra, and X-ray structural determination. The crystal data of complex 1 are monoclinic, P21/c space group,a = 1.6521(3) nm, b =2.8274(3) nm, c = 1.2074(2) nm, β = 111.723(6)°, V= 5.2393(14) nm3, Z = 2, Dc =1.259 mg·m-3, μ = 1.304 mm-1, F(000) = 2092, R = 0.0815, wR = 0. 1723. Complex 1 is a dimer with two Eu - O bridges. The coordination geometry of each europium atom can be best described as a distorted trigonal bipyramid.
Key words:inorganic chemistry; carbon-bridged biphenolate lanthanide complex; crystal structure; rare earths;
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