经过三步反应合成了红色晶体,双六甲基二硅胺基二甲基硅基环戊二烯基稀土二价镱配合物[η5-C5H4S iM e2N(S iM e3)2]2Yb(Ⅱ).2THF,X射线衍射结果表明,[η5-C5H4S iM e2N(S iM e3)2]2Yb(Ⅱ).2THF属于单斜晶系,空间群为P21/c,a=1.646 87(1...经过三步反应合成了红色晶体,双六甲基二硅胺基二甲基硅基环戊二烯基稀土二价镱配合物[η5-C5H4S iM e2N(S iM e3)2]2Yb(Ⅱ).2THF,X射线衍射结果表明,[η5-C5H4S iM e2N(S iM e3)2]2Yb(Ⅱ).2THF属于单斜晶系,空间群为P21/c,a=1.646 87(12)nm,b=0.907 70(6)nm,c=3.049 4(3)nm,β=93.642(4),°V=4.549 3(6)nm3,Z=2,C34H72N2O2S i6Yb,Mr=1 905.41,Dc=1.288 g/cm3,F(000)=1 840.00,μ(MoKα)=22.42 cm-1(λ=0.071 070 nm)。收集独立衍射点7 814个,将其中I>3.00σ(1)的用于结构解析,用全矩阵最小二乘法校正,得最终偏离因子R=0.039,Rw=0.050。8配位的中心镱原子与2个四氢呋喃的氧及2个环戊二烯基配位形成扭曲的四面体结构。展开更多
To improve oxygen-enriching properties of cellulose derivative membranes, trimethylsilyl methylcellulose (TMS-MC) with degree of substitution (DS) of 1.12 was synthesized by using methylcellulose with DS of 1.80 as ra...To improve oxygen-enriching properties of cellulose derivative membranes, trimethylsilyl methylcellulose (TMS-MC) with degree of substitution (DS) of 1.12 was synthesized by using methylcellulose with DS of 1.80 as raw material and hexamethyldisilazane as reactant in a homogeneous reactive system.The chemical structures of TMS-MC were characterized with FT-IR and 1H NMR.The product samples were fairly soluble in ordinary organic solvents such as tetrahydrofuran, chloroform, xylene, toluene, and so on.The gas separation membranes were prepared by casting a xylene solution of TMS-MC on a sheet of PET.It was found that the oxygen permeation properties of the TMS-MC membrane were improved and an obvious increase in separation factor was obtained especially.Comparing with methylcellulose, for example, the permeability coefficient and separation factor of the TMS-MC membrane increased from 2.5 Barrer and 2.41 to 23.85 Barrer and 5.42 at 20℃, respectively.展开更多
文摘To improve oxygen-enriching properties of cellulose derivative membranes, trimethylsilyl methylcellulose (TMS-MC) with degree of substitution (DS) of 1.12 was synthesized by using methylcellulose with DS of 1.80 as raw material and hexamethyldisilazane as reactant in a homogeneous reactive system.The chemical structures of TMS-MC were characterized with FT-IR and 1H NMR.The product samples were fairly soluble in ordinary organic solvents such as tetrahydrofuran, chloroform, xylene, toluene, and so on.The gas separation membranes were prepared by casting a xylene solution of TMS-MC on a sheet of PET.It was found that the oxygen permeation properties of the TMS-MC membrane were improved and an obvious increase in separation factor was obtained especially.Comparing with methylcellulose, for example, the permeability coefficient and separation factor of the TMS-MC membrane increased from 2.5 Barrer and 2.41 to 23.85 Barrer and 5.42 at 20℃, respectively.
