检索结果-南通市图书馆

A Novel Divalent ytterbium complex Supported by a Bridged Diamide Ligand： Synthesis and Structure of [{Me2Si（NPh ）2Yb（THF）2}（μ3-CI）（μ4-CI）{Li（TH F） }2]2·2THF

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2007年第5期25卷 670-673页

作者：陆澄容赵蓓周利英沈琪姚英明张勇 Key Laboratory of Organic Synthesis of Jiangsu Province Department of Chemistry and Chemical Engineering Suzhou University Suzhou Jiangsu 215123 China

The reaction of anhydrous YbCl3 with 1 equiv, of Li2Me2Si（NPh）2 in THF, after workup, yielded a ytterbium（Ⅲ） chloride [{Me2Si（NPh）2Yb}（μ2-CI）（TMEDA）]2·3PhMe （1）（TMEDA=tetramethylethanediamine）. The same reaction followed by treatment with Na-K alloy afforded a new ytterbium（H） complex supported by a bridged diamide with four coordinated LiC1 molecules, [{Me2Si（NPh）2Yb（THF）2}（μ3-CI）（μ4-CI）{Li（THF）}2]2·2THF （2） in high yield. Both complexes were structurally characterized by X-ray analysis to be dimers. complex 1 was a chlorine-bridged dimer with ytterbium in a distorted octahedral geometry. In complex 2 two [Me2Si（NPh）2Yb（THF）2]- （μ3-CI）[Li（THF）]2 moieties were connected with each other by two μ4-CI bridges to form a ＂chair-form＂ framework.

关键词： ytterbium complex bridged diamide synthesis crystal structure

Polymerization of Methyl Methacrylate by Diisopropylamido bis(methylcyclopentadienyl) ytterbium complex

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1997年第7期8卷 637-638页

作者： Mao, LS Xue, MQ Shen, Q SUZHOU UNIV DEPT CHEMSUZHOU 215006PEOPLES R CHINA

It was first found that diisopropylamido bis(methylcyclopentadienyl) ytterbium complex (MeCp)(2)YbN(i-Pr)(2)(THF) exhibits extremely high catalytic activity in the polymerization of methyl methacrylate. The reactions can be carried out over a quite broad range of polymerization temperatures from -78 degrees C to 40 degrees C. The results of GPC (gel permeation chromatography) indicate that the molecular weight distribution (Mw/Mn) becomes broad with the increase of temperature.

关键词： THF Polymerization of Methyl Methacrylate by Diisopropylamido bis methylcyclopentadienyl ytterbium complex

Metallotricycle of Lanthanide Supported by a Bridging Diamide： Syntheses and Molecular Structures of {Li（THF）3[LnCl（μ2-trans- 1,2-（NSiMe3）2C6H10）（μ2-Cl）]}2·2THF （Ln=Yb, Nd）

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2007年第10期25卷 1588-1592页

作者：陆澄容李红海赵蓓沈琪姚英明张勇 Key Laboratory of Organic Synthesis of Jiangsu Province School of Chemistry and Chemical Engineering Suzhou University Suzhou Jiangsu 215123 China State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic Chemistry Chinese Academy of Sciences Shanghai 200032 China

The reactions of dilithium salt of trans-1,2-bis（trimethylsilylamino）cyclohexane with anhydrous lanthanide trichlorides LnCl3 （Ln = Yb, Nd） in THF afforded the dianionic binuclear tricycles of lanthanide chlorides {Li（THF）3[LnCl（μ2-trans-1,2-（NSiMe3）2C6H10）（μ2-Cl）]}2·2THF （Ln=Yb 1, Nd 2） in moderate yields. Both of the bridged complexes were characterized by elemental analysis, IR spectroscopy and single-crystal X-ray diffraction. Crystal structural analysis shows that the two complexes are the analogues which have a tricyclic framework built by two bridged lanthanide metals, four nitrogens and four carbons from two diamide ligands. Each lanthanide metal coordinates to three nitrogen atoms and two chlorines to form a distorted trigonal bipyramid and connects with a lithium by a bridging chlorine.

关键词： metallomacrocycle bridging diamide ytterbium complex neodymium complex crystal structure

Synthesis and Crystal Structure of [Yb(NTO)_3(H_2O)_4]·6H_2O

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare Earths 1997年第1期15卷 63-66页

作者：宋纪蓉董武李福平郁开北

Yb(NTO) 3(H 2O) 4]·6H 2O was synthesized by mixing an aqueous solution of lithium 3 nitro 1,2,4 triazol 5 onate(LiNTO) and the dilute nitric acid solution of ytterbium oxide. The crystal structure has been determined by a four circle X ray diffractometer. The crystal is monoclinic, space group C2/c with crystal parameters a= 3 6931(5) nm, b =0 6683(10) nm, c =2 5656(3) nm, β =130 974(5)°, V =4 7811(11) nm 3, Z =8, d c=2 013 g·cm -3 , μ =4 017 mm -1 , F (000)=2850. The final R is 0 0258, the coordination number of Yb 3+ is seven and the geometry of the ytterbium complex is pentagonal bipyramid.

关键词： Rare earths NTO ytterbium complex Crystal structure

Synthesis and Crystal Structure of a Heteropentanuclear Yb(Ⅲ)-Cu (Ⅱ) complex:[Yb_2Cu_3(O_2CCH_2CI)_(12)(H_2O)_8]·2H_2O

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 1998年第1期17卷 5-8页

作者： CUI Yong ZHENG Fa-Kun YAN Duan-Chao CHENG Wen-Dan HUANG Jin-Shun(State Key Laboratory of Structural Chemistry, Fujian Institute of Research onthe Structure of Matter, the Chinese Academy of Sciences, Fuzhou, 350002)(State Key Lab. of Rare Earth Materia

The title complex [Yb2Cu3 （O2CCH2CI ）12 （H2O）8]·2H2O（Mr=1838. 73） crystallized in monoclinic space group P21/c, with a=10. 424 （6 ）, b= 17.953（4）, c=15. 193（4）A, β=100. 18（1）, V=2798（2） A3, Z=2, Dc=2.18 g/cm3, R=0. 066, Rw=0. 081 for 3653 unique reflections with I＞ 3（I）, u=50. 9cm-1, F （000）=1782, in which the Cu and Yb atoms are bridged uniquely bychloroacetate groups. The Cu atoms display two types of coordination spheres, a fourcoordinate distorted square and a five-coordinate square pyramid, and the coordinationgeometry of each Yb atom is a square antiprism.

关键词： crystal structure ytterbium complex coppler complex carboxylate complex