共查询到20条相似文献,搜索用时 9 毫秒
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报道了NdC_6H_6(AlCl_4)_3-AlR_3体系催化丁二烯与异戊二烯共聚反应的一般规律。催化活性依赖于两种单体的配比、单体浓度、烷基铝性质及聚合温度。制得的双烯共聚物具有高1,4链节结构。 相似文献
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<正> Compound (η5-C5H5)GdCl2(THF)3 was successfully prepared from action of GdCl3 and NaC5H5 in tetrahydrofuran (THF). X-ray diffraction data were collected at low temperature (about 210K). Its crystal belongs to the monoclinic space group P 21/n with a = 7. 821(2), b = 17.068(1), c=15. 057(1)(?), β=94. 76 (2)°, V = 2003. 2(10)(?)3, Z = 4, Dc=1. 69g/cm3, F(000)=1012, Mr=509. 6. The structure was solved by heavy-atom method. Least-squares refinement converged to a final R value of 0. 050. The coordination number of the Gd atom is 8. The centre of the cyclopentadienyl, the two Cl atoms and the three oxygen atoms of THF molecules form a distorted octahedron about the Gd atom. 相似文献
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稀土配合物能使极性和非极性单体聚合[1] .虽然目前已测定了几乎所有的三 (环戊二烯基 )稀土配合物及部分三 (取代环戊二烯基 )稀土配合物的晶体结构 ,但有关三 (茚基 )稀土配合物的报道较少 .第一个三 (茚基 )稀土配合物是无水三氯化稀土与 3倍物质的量的茚基钠 C9H7Na在四氢呋喃中反应而得 ,但未报道其晶体结构[2 ] .后来用同样的反应却分离出以氯为桥的二聚体离子对配合物[Na( THF) 6][Ln( η5- C9H7) 3μ( Cl) Ln( η5- C9H7) 3]( Ln=Nd,Sm) [3] .无水三氯化稀土与 Mg( C9H7) 2 或C9H7K等物质的量反应则生成非溶剂化的 ( C9H7… 相似文献
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(C5H4CH3)3Ho和(C5H4CH3)2Ho(C5H5)与5-本基四唑在THF中反应,得到了复合产物「(C5H4CH3)2HoN4CPh」2.「(C5H4CH3)(C5H5)HoN4CPh」2,该晶体属三斜晶系,P1空间群,晶胞参数为a=9.386(3),b=13.071(3),c=16.571(2)A,α=86.90(1),β=74.61(2),γ=77.30(2)°,V=1912.8(8 相似文献
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K10H3[Ln(SiMo11—nWnO39)2].mH2O(n=5,7,9)... 总被引:4,自引:0,他引:4
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LIAN Zhao-Xun ;LIU Ping ;ZHANG Jia-Min ;LOU Tian-Jun ;WANG Tian-Xi ;LI Hao-Hong 《结构化学》2008,27(6):639-644
The title compounds, Cu(L1)(C4H8NHO) and Ni(L2)(C4H8NHO) (H2L1 = 5-bromosalicylaldehyde-p-nitrobenzoylhydrazone, H2L2 = 5-bromosalicylaldehyde-p-hydroxybenzoylhydrazone), have been obtained and characterized by single-crystal X-ray diffraction. Complex 1 belongs to the triclinic system, space group P1 with a = 8.6960(2), b = 9.957(2), c = 11.878(2)A, α = 73.36(3), β = 78.25(3), γ = 82.64(3)°, V = 962.1(3) A^3, Mr= 512.81, Z = 2, F(000) = 514, Dc = 1.770 g/cm^3,μ(MoKα) = 3.251, R = 0.0337 and wR = 0.0846. Complex 2 is of monoclinic, space group P21/c with a = 13.313(2), b = 8.2096(1), c = 21.890(3) A,β = 125.737(3)°, V = 1941.9(4) A^3, Mr= 478.97, Z = 4, F(000) = 968, Dc = 1.638 g/cm^3,μ(MoKα) = 3.085, R = 0.0356 and wR = 0.0817. The ligands form a satisfactory N2O2 square plane around the metal centers in two compounds. Different patterns of hydrogen bonds are observed owing to the presence of different substituents on aromatic ring of the acylhydrazone Schiff bases. In complex 1, square-planar copper(Ⅱ) complexes are linked by intermolecular hydrogen bonds leading to zigzag infinite chains. In complex 2, the metal complexes are linked via hydrogen bonds to form corrugated sheets in a staggered fashion; 3D channels along the b axis are constructed through other non-covalent interactions between the neighboring layers. 相似文献
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