- Structural and photophysical study of copper iodide complex with P^N or P^N^P ligand
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Two P^N-type ligands, 8-(diphenylphosphino)quinoline (L1) and 2-[2-(diphenylphosphino)ethyl]pyridine (L2), and two P^N^P-type ligands, 2,6-bis((diphenylphosphino)methyl)pyridine (L3) and 2,6-bis((di-tert-butylphosphino)methyl)pyridine (L4), were synthesized to coordinate with copper iodide (CuI). As a result, CuI complexes with rich structures, such as discrete complexes with formulae of [Cu 2I2(L1)2] (5), [Cu3I 3(L2)2] (6), and [CuI(L3)] (7), and polymeric complexes with repeating units of [Cu2I2(L 4)] (8), and [Cu3I3(L4)] (9) were synthesized and characterized by single crystal X-ray diffraction. Besides the intriguing structures, these complexes showed rich photoluminescent properties, with emission colour that varied from blue to red and a photoluminescence quantum yield (PLQY) from 1.6 to 29.9% in the solid state. Molecular orbital calculation and experimental study showed that the emissions involve halide to ligand charge transfer (XLCT), metal to ligand charge transfer (MLCT), and/or cluster-centered (CC) excited states. This journal is the Partner Organisations 2014.
- Liu, Zhiwei,Wei, Feng,Liu, Xiaochen,Bian, Zuqiang,Zhao, Yongliang,Huang, Chunhui
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p. 5338 - 5344
(2014/06/23)
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- Stereospecific polymerization of 1,3-butadiene catalyzed by cobalt complexes bearing N-containing diphosphine PNP ligands
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A series of cobalt complexes bearing N-containing diphosphine PNP ligands has been synthesized and characterized. The nature of the ligand structure affects the binding of the ligand to the cobalt center and determines the coordination geometry of the cobalt complexes. All the complexes have been employed to catalyze the polymerization of 1,3-butadiene, in combination with methylaluminoxane (MAO) or ethylaluminum sesquichloride (EASC) as the cocatalyst. Both the nature of the ligand and the type of cocatalyst had a remarkable influence on the polymerization activity, microstructure and molecular weight of the resulting polymers. The [Co]/MAO catalytic systems resulted in relatively lower conversions of butadiene and cis-1,4 contents in the polymers than the corresponding [Co]/EASC catalytic systems. Upon activation with EASC, the polymerization behaviors of the catalytic systems were also affected by the reaction parameters.
- Chen, Lin,Ai, Pengfei,Gu, Jianming,Jie, Suyun,Li, Bo-Geng
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- Synthesis of trifunctional ligands containing thiophosphoryl, pyridine and pyridine N-oxide donor groups
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The trifunctional mixed donor ligands 2,6-[R2P(S)CH2]2C5H3N 1 (R = Ph 1a, Tol 1b, n-Bu, 1c) and 2,6-[R2P(S)-CH2]2C5H3NO 2 (R = Ph 2a, Tol 2b, n-Bu, 2c) have been prepared and characterized by spectroscopic (MS, IR, NMR) techniques. The coordination chemistry of one derivative 1a has been examined and the complex {[Ph2P(S)-CH2]2 C5H3N} Ni(NO3)2 has been crystallized and characterized by single-crystal X-ray diffraction methods. The structure contains a six coordinate Ni(II) ion bonded to a tridentate ligand 1a with Ni-Npyr 2.110(3) A and Ni-S 2.481(1) and 2.402(1) A, a bidentate nitrate anion and a monodentate NO3- anion.
- Gan, Xin-Min,Duesler, Eileen N.,Parveen, Sahrah,Paine, Robert T.
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p. 4704 - 4708
(2007/10/03)
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- A NEW FAMILY OF AROMATIC POLYIMINE CHELATES SUBSTITUTED WITH TWO DIPHENYLPHOSPHINES
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Reaction of lithium diphenylphosphide with vicinal nitrogen disubstituted polyimines such as 1,8-naphtyridine, 4'-phenyl-2,2',6',2''-terpyridine, 2,2'-bipyridine or 1,10-phenanthroline produces in high yield a new series of heterofunctional ligands.
- Ziessel, Raymond
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p. 463 - 466
(2007/10/02)
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