论文部分内容阅读
Anhydrous EuCl_3 reacted with sodium carbon-bridged biphenolate LNa_2 [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, P2_1/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, D_c=1259 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.
Anhydrous EuCl_3 reacted with sodium carbon-bridged biphenolate LNa_2 [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. The crystal data of complex 1 are monoclinic, P2_1 / c space group, a = 1.6521 (3) nm, b = 2.8274 (3) nm, (1), F = (1), D = 1.259 mg · m -3, μ = 1.304 mm -1, = 2092, R = 0.0815, wR = 0.1723. The coordination geometry of each europium atom can be best described as a distorted trigonal bipyramid.