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Karl-Heinz Thiele Sergio Bambirra Joachim Sieler Svea Yelonek 《Angewandte Chemie (International ed. in English)》1998,37(20):2886-2888
Different bonding modes are characteristic for the lanthanum centers of the title compound, a trinuclear lanthanum–pyrene complex in which an arene trianion is present for the first time (see picture for the structure). Thus, La1 and La3 reside in a tetrahedral environment, the La2 center in a distorted trigonal-bipyramidal one. 相似文献
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Glen B. Deacon Ewan E. Delbridge Brian W. Skelton Allan H. White 《Angewandte Chemie (International ed. in English)》1998,37(16):2251-2252
A higher degree of coordination saturation is attainable through the unusual coordination mode in the title compound 1 , in which the central pyrazolate groups function both as chelating and as bridging ligands. There is some asymmetry in the bridging, and the N atoms of each μ-η2:η2-pyrazolato ligand are 0.07–0.11 Å closer to one of the two Yb centers. 相似文献
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J. Bularzik K. Kourtakis J. Nitschke W. Ttsche 《Acta Crystallographica. Section C, Structural Chemistry》1985,41(10):1426-1428
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SUN Wen-Hua YANG Shi-Yan WANG Han-Qing YUAN Dong-Feng HOU Zhi-Qiang CHEN Yu-QingState Key Laboratory of Structural Chemistry State Key Laboratory of Oxo Synthesis SelectiveOxidation Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou Gansu ChinaYU Kai-BeiChengdu Center of Analysis Measurement Chinese Academy of Sciences Chengdu Sichuan China 《中国化学》1994,12(2):123-128
Tris)(η 5-cyclopentadienyl-μ-carbonyl-iron)-μ3-nitrosyl cluster was obtained from the reaction of cyclopentadienyl dicarbonyliron dimer with nitrogen monoxide in xylene. The cluster was characterized by elemental analyses, IR, MS and 1H NMR. The crystal structure of [(η5-C5H5)(μ-CO)Fe]3(μ3-NO).C4H8O was determined by X-ray diffraction analysis. It crystallizes in the orthorhombic space group Pnma, a=9.053(2), 6=10.545(2), c=22.525(4) A, V=2150.3(7) A3, Z=4,Dc=1.68 g.cm-3; structure solution and refinement based on 1141 reflections with I > 3.0 (I) (MoKa, A=0.71073 A) converged at R=0.0540. The infrared absorption band at 1325 cm-1 of the μ3-NO in the cluster, which is red shifted, shows that μ3-NO is activated. 相似文献
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Marita Hohmann Luise Krauth-Siegel K. Weidenhammer Wolfgang Schulze Manfred L. Ziegler 《无机化学与普通化学杂志》1981,481(10):95-106
Molecular and Crystal Structures of (CO)4W(μ-S-t-C4H9)2W(CO)4, η7-C7H7W(μ-SC6H4CH3)3W(CO)3 and η7-C7H7W(μ-S-n-C4H9)3W(CO)(μ-S-n-C4H9)2W(CO)4 The molecular structures of the two binuclear complexes (CO)4W(μ-S-t-C4H9)2W(CO)4 and η7-C7H7W(μ-SC6H4CH3)3W(CO)3 and of the tungsten cluster η7-C7H7W(μ-S-n-C4H9)3W(CO)-(μ-S-n-C4H9)2W(CO)4 respectively are described. In the nonlinear trinuclear cluster the central tungsten atom is connected to the two tungsten atoms by two and three μ-S-n-C4H9 bridges respectively and additionally by one W? W bond each. The coordination sphere of the W atoms is completed by a η7-C7H7 ring and four CO groups respectively; the central tungsten carries an additional CO group. 相似文献
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