Synthesis and Characterization of A Polynuclear Yttrium Trifluoroethoxide and Its Activity for Oligomerization of Phenyl Isocyanate  

作　　者：彭红梅 姚英明 邓明宇 张勇 沈琪 

机构地区：[1]Key Laboratory of Organic Synthesis of Jiangsu Province, Department of Chemistry and Chemical Engineering, Suzhou University, Suzhou 215123,China

出　　处：《Journal of Rare Earths》2006年第4期509-512,共4页稀土学报（英文版）

基　　金：Project supported bythe National Natural Science Foundation of China (20472063)

摘　　要：A polynuclear yttrium trifluoroethoxide was synthesized and its activity for the oligomerization of phenyl isocyanate was tested. Reaction of anhydrous YC13 with CF3CH2ONa in a 1 ： 3 molar ratio in THF at room temperature, after workup, gave complex 1 as colorless crystals. The composition of complex 1 is [Y（OCH2CF3）3]6ONa2（THF）12, which was identified by elemental analysis and ^1H NMR. Further X-ray structure determination reveals that complex 1 is a polynuclear ion pair compound, [Y6（μ6-O）（OCH2CF3）18]^2- [Na（THF）6]2＋ （1）. The crystal data of complex 1 are trigonal, P-3 space group, a = 1.78440（14） nm, b = 1.78440（14） nm, c = 1.27395（12） nm, γ= 120°, V=3.5129（5） nm^3, Z = 1, Dc = 1.607 mg·m^-3, μ = 2.591 mm^- 1（Mo Ka）, F（000） = 1710, R = 0.067, wR = 0. 182. Preliminary results demonstrated that complex 1 is a highly effective catalyst for the oligomerization of phenyl isocyanate.A polynuclear yttrium trifluoroethoxide was synthesized and its activity for the oligomerization of phenyl isocyanate was tested. Reaction of anhydrous YC13 with CF3CH2ONa in a 1 ： 3 molar ratio in THF at room temperature, after workup, gave complex 1 as colorless crystals. The composition of complex 1 is [Y（OCH2CF3）3]6ONa2（THF）12, which was identified by elemental analysis and ^1H NMR. Further X-ray structure determination reveals that complex 1 is a polynuclear ion pair compound, [Y6（μ6-O）（OCH2CF3）18]^2- [Na（THF）6]2＋ （1）. The crystal data of complex 1 are trigonal, P-3 space group, a = 1.78440（14） nm, b = 1.78440（14） nm, c = 1.27395（12） nm, γ= 120°, V=3.5129（5） nm^3, Z = 1, Dc = 1.607 mg·m^-3, μ = 2.591 mm^- 1（Mo Ka）, F（000） = 1710, R = 0.067, wR = 0. 182. Preliminary results demonstrated that complex 1 is a highly effective catalyst for the oligomerization of phenyl isocyanate.

关 键 词：inorganic chemistry lanthanide alkoxo complex trifluoroethoxide crystal structure rare earths 

分 类 号：O631.3[理学—高分子化学]