Taiyuan, China
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Chen J.,Taiyuan Teachers College
Mendeleev Communications | Year: 2014

The reaction of a lithium ansa-bis(aminopyridinato) ligand {L = } with ZrCl4 afforded the dimeric complex [LZrCl(m-Cl)]2 which was characterized by X-ray structure analysis and found active in catalyzing ethylene polymerization. © 2014 Mendeleev Communications. All rights reserved.


Chen J.,Taiyuan Teachers College
Acta Crystallographica Section E: Structure Reports Online | Year: 2012

In the heterometallic title bulky amido complex, [LiNa(C15H21N2Si) 2(C6H16N2)], both alkali metal ions are four-coordinated with distorted tetrahedral geometries. The Li+ ion is N,N′-chelated by the N-silylated amido ligand, with Li-N = 2.015 (5) and 2.074 (5) Å. The two amido ligands are arranged cis to each other. The molecule exhibits a twofold rotational symmetry operation along the Li-Na axis. The Na+ ion is coordinated by two N atoms from the tetramethylethylenediamine ligand [Na-N = 2.553 (4) Å] and shares two amido N atoms from the N-silylated amido ligands with the Li+ ion. Although the crystal structure contains voids with an approximate volume of 50 Å3 there is no inclusion of solvent molecules.


Yuan W.,Taiyuan Teachers College | Xu G.,Tianjin University
Proceedings of the 30th Chinese Control Conference, CCC 2011 | Year: 2011

In this paper, two optimization problems of a system composed of main unit and standby unit with repairs for common cause failure and critical human error is considered. The multi-objective of availability of the system and repair cost in infinite Banach space is discussed. Under certain condition, the existence of the optimal repair rate is established by transferring the optimal problem into steady-state reliability. In particular, the optimization solution are obviously given. © 2011 Chinese Assoc of Automati.


Chen J.,Taiyuan Teachers College
Acta Crystallographica Section E: Structure Reports Online | Year: 2013

The title complex, [Li4(C17H14N 4)2(C4H8O)4], bears a novel tetradentate diamido ligand. In the tetranuclear centrosymmetric complex molecule, the metal atoms exhibit two kinds of coordination modes. The middle two Li+cations are coordinated by four N (ligand) and one O (tetrahydrofuran, THF) atoms, resulting in a distorted square-pyramidal geometry. The outer two Li+cations are in distorted tetrahedral environments consisting of three N (ligand) and one O (THF) atoms. The Li-N bond lengths vary from 2.020 (7) to 2.441 (6)Å.


Chen J.,Taiyuan Teachers College
Acta Crystallographica Section E: Structure Reports Online | Year: 2010

In the monomeric title titanium(III) compound, [Ti(C12H 21N2Si)2Cl], the metal atom is surrounded by two N-silylated anilide ligands in an N,N″-chelating mode. The two ends of the N - Si - N chelating unit exhibit different affinity to the metal center. The Ti - Namine bond is longer than the Ti - Nanilide bond by about 0.29 Å. The two ligands are arranged trans to each other and the molecule demonstrates a pseudo-twofold rotation along the axis of the Ti - Cl bond. The five-coordinate Ti atom demonstrates a highly distorted trigonal-bipyramidal geometry.


Chen J.,Taiyuan Teachers College
Acta Crystallographica Section E: Structure Reports Online | Year: 2010

The title compound, [Cu2(C12H21N 2Si)2], is a binuclear CuI complex. The dimeric mol-ecule has an inversion center located at the mid-point of the Cu - Cu bond [Cu - Cu = 2.7209 (7) Å]. The bidentate ligand behaves in an N:N′-bridging mode, coordinating the metal atoms. The N - Cu - N unit is close to being linear [176.60 (8)°]. The two N atoms exhibit different affinities for the metal atom. The Cu - Namino bond is longer than the Cu - Nanilido bond by 0.079 Å. The core of the mol-ecule, the [Cu - N - Si - N]2 eight-membered ring, adopts a chair configuration.


Chen J.,Taiyuan Teachers College
Acta Crystallographica Section E: Crystallographic Communications | Year: 2015

The title zinc amide, [Zn(C12H21N2Si)2], was prepared by the metathetical reaction of [LiN(SiMe2NEt2)(C6H5)]2 with zinc dichloride. It is mononuclear and the molecule is generated by twofold rotation symmetry. The central ZnII atom is N,N'-chelated by each of the two N-silylated anilide ligands in a highly distorted tetrahedral environment. Two N - Si - N ligands are arranged in a cis fashion around the ZnII atom. The Zn - Namine bonds [2.2315(12)Å] are much longer than the Zn - Nanilide bonds [1.9367(11)Å].


Chen J.,Taiyuan Teachers College
Acta Crystallographica Section E: Structure Reports Online | Year: 2012

In the title binuclear Co II complex, [Co 2(C 12H 21N 2Si) 2Cl 2], an inversion center is located at the mid-point between the two Co atoms in the dimeric molecule. The bidentate N-silylated anilide ligand coordinates the Co II atom in an N,N'-chelating mode and provides the anilide N atom as a bridge to link two Co II atoms. The two ends of the N-Si-N chelating unit exhibit different affinities for the metal atom. The Co-N anilide bond is 2.031(6) Å and Co-N amino bond is 2.214(6) Å. The four-coordinate Co atom presents a distorted tetrahedral geometry, while the dimeric aggregation exhibits a (CoN) 2 rhombus core with 1.998(6) Å as the shortest sides and shows a ladder structure composed of Co, N and Si atoms.


Chen J.,Taiyuan Teachers College
Acta Crystallographica Section E: Structure Reports Online | Year: 2012

In the title iron(II) complex, [Fe(C12H21N2Si)Cl(C6H16N2)], the Fe II cation is coordinated by two N atoms from the tetramethylethane-1, 2-diamine ligand [Fe-N = 2.191 (5) and 2.215 (4) Å], one N atom from the N-[(diethylamino)dimethylsilyl]anilide ligand [Fe-N = 1.943 (4) Å] and a chloride ligand [Fe-Cl = 2.2798 (16) Å] in a distorted tetrahedral geometry. The N-Si-N angle is 113.9 (3)°. The crystal packing exhibits no short intermolecular contacts.


PubMed | Taiyuan Teachers College
Type: Journal Article | Journal: Acta crystallographica. Section E, Crystallographic communications | Year: 2016

The title zinc amide, [Zn(C12H21N2Si)2], was prepared by the metathetical reaction of [LiN(SiMe2NEt2)(C6H5)]2 with zinc dichloride. It is mononuclear and the mol-ecule is generated by twofold rotation symmetry. The central Zn(II) atom is N,N-chelated by each of the two N-silylated anilide ligands in a highly distorted tetra-hedral environment. Two N-Si-N ligands are arranged in a cis fashion around the Zn(II) atom. The Zn-Namine bonds [2.2315(12)] are much longer than the Zn-Nanilide bonds [1.9367(11)].

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