Synthesis and Crystal Structure of Triindenyllanthanide Complexes (η~5-C_9H_7)_3Ln·OC_4H_8(Ln=Nd,Gd,Er)

Tj,e 211介‘丫,斤沪lel。、(叮,一CoH二)了乙n·Oc、H,‘L)了=Nd,Gd,百r/。er。又,工nzhes七ed方、,the脚erhod,,hiehlsd{[/ere,,1./,、,川hat In zzze,ature and、、人aruerer七ed从·‘扮,。enzaz analy、行,i,2斤are(l切eollru,:,‘价万材尺anJ材5.Ina翻zion rhe(·厂,,staz、zruozure:Oj’‘叮j一c、H:z,Ntl·o〔与万、(l夕‘,nJ厂叮,一C,H7z,Gd·o几万、厂2),,℃re女ter-mine‘l乃一lhe,,,etho‘10/.人匕,丫走飞一价厅ra‘了‘on.6,。,le工es 1 an汀2 bel()ng to hex叮ona/sPa〔·eg,刀即夕岛、、lizh‘、ell尸ara川eter.、u…     

Crystal Structure of{[(μ_2-Cl)(C_5H_5)Sm(μ_2-Cl)]_2(μ_3-Cl)(μ_4-O)Sm(μ_2-Cl)·THF}_2~(2-)·[Li(DME)_2·Li(THF)_2·DME]~(2 )·DME

The crystal structure of title complex has been determined by the method of X-ray single crystaldiffraction.The crystal belongs to monoclinic space group C_(2/c)with the unit parameters a=2.8907(7),b=2.0431(5),c=1.5723(3)nm;β=115.67(2)°.The unit volume V is 8.36924(348)nm~3;Z=8,Dc=1,82g·cm~(-3),μ(MoK_α)=46.4cn~(-1); F(000)=4416.The final R is 0.083,Rw 0.088.The title complex con-sists of two univalent cations and one divalent anion.The anion has a cluster structure including six Sm~(3 ).Coordination numbers of all six Sm~(3 )are eight,but their surroundings are different from each other.Two ofthem are decahedral array,and the others are octahedral array f the centroid of each pentacyclodienyl ring istaken as one point.     

在汽油中以WCl_6-Al(i-Bu)_3—四氯苯酚为催化剂的环戊烯开环聚合

在前文中,我们报导了在甲苯中以WCl_6—Al_2Et_3Cl_3—四氯苯酚为催化剂的环戊烯开环聚合。在此基础上,又开展了在汽油中以相似催化体系引发的环戊烯开环聚合的研究。在国外,环戊烯开环聚合的研究,绝大多数是以甲苯为溶剂;而以汽油为溶剂的聚合研究,尚未见公开报导,仅有     

Preparation and Characterisation of Cyclopentadienyl Tetramethylethene－bridged Dicyclopentadienylsamarium（Ⅲ）Tetrahydrofuranate Complexes

ＰｒｅｐａｒａｔｉｏｎａｎｄＣｈａｒａｃｔｅｒｉｓａｔｉｏｎｏｆＣｙｃｌｏｐｅｎｔａｄｉｅｎｙｌＴｅｔｒａｍｅｔｈｙｌｅｔｈｅｎｅ－ｂｒｉｄｇｅｄＤｉｃｙｃｌｏｐｅｎｔａｄｉｅｎｙｌｓａｍａｒｉｕｍ（Ⅲ）Ｔｅｔｒａｈｙｄｒｏｆｕｒａｎａｔｅ　Ｃｏｍｐ...     

添加剂对聚乳酸湿热降解性的影响

文中研究了聚乳酸在日常使用温度、湿度条件下的降解行为。实验发现,聚乳酸热氧降解几乎可以忽略,主要的降解形式是吸湿后的水解。采用熔融共混添加剂的方法,加入憎水性添加剂二甲基硅油降低聚乳酸的吸湿性,加入碱性添加剂改变聚乳酸的pH值,都可以降低聚乳酸的湿热降解率。加入0.5%~1.5%硬脂酸钠效果最好,其中加入1.0%的聚乳酸树脂在60℃,70%相对湿度条件下24 h仅降解16.96%,而没有添加剂的树脂降解高达68.16%。