- Highly Efficient Solid-State Phosphorescence of Platinum Dihalide Complexes with 9-Phenyl-9-arsafluorene Ligands
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Platinum dihalide (chloride, bromide, and iodide) complexes with 9-phenyl-9-arsafluorene, which can be safely prepared and are air stable, were synthesized. The dibromide and diiodide complexes showed highly efficient phosphorescence even at 298 K in the solid state, and their quantum yields were up to a value of 0.52. The structures of the complexes were analyzed by X-ray crystallography. Time-dependent density functional calculations support our understanding of the initial electron transition processes. The rigid and bulky structure of the arsafluorene backbone effectively induced solid-state phosphorescence unlike that of a triphenylarsine analogue, which has three unbridged phenyl groups.
- Imoto, Hiroaki,Tanaka, Susumu,Kato, Takuji,Watase, Seiji,Matsukawa, Kimihiro,Yumura, Takashi,Naka, Kensuke
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p. 364 - 369
(2016/02/19)
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- Synthesis and X-ray structure of an octahedral platinum-silver cluster [(Ph3P)2N]2[Pt2Ag4Cl 2(C2Ph)8] with disordered silver atoms
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Variable-temperature X-ray structural study of the complex [(Ph 3P)2N]2[Pt2Ag4Cl 2(C2Ph)8] prepared by the reaction of cis-[PtCl2(AsPh3)2/s
- Al-Abdulkarim, Hessah A.,Batsanov, Andrei S.
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p. 319 - 322
(2012/02/02)
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- Thermal analysis of coordination compounds. Part 3. Thermal decomposition of platinum complexes containing triphenylphosphine, triphenylarsine and triphenylstibine
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Studies by thermogravimetric analysis (TG) and differential thermal analysis (DTA) of the complexes [PtCl2L2] (L is PPh3, AsPh3, SbPh3), [PtLn] (n = 3, L is SbPh3; n= 4, L is PPh3, AsPh3); [(PtL3)2N2]; [(PtL3)2C2] and [Pt(CO)2L2] (L is SbPh3) are described. Analysis of the TG and DTA curves showed that Pt(II) complexes of the type [PtCl2L2] have a higher thermal stability than the corresponding Pt(0) complexes of the type [PtLn], with the exception of [Pt(SbPh3)3], which is more stable than [PtCl2(SbPh3)2]. Thermal stabilities of each of the complexes are compared with those of the others in the series. Mechanisms of thermal decomposition of complexes of the types [PtCl2L2] and [PtLn] are proposed. Residues of the samples were characterized by chemical tests and IR spectroscopy. The residue from the thermal decomposition of [PtCl2L2] (L is PPh3, AsPh3)and [Pt(PPh3)4] is metallic platinum. For [Pt(AsPh3)4] the residue is a mixture of Pt and As, whereas for the complexes containing SbPh3 the re sidues are mixtures of Pt and Sb. In these cases, the proportional contents of Pt and As or Pt and Sb correspond to the stoichiometry of these elements in the respective complexes. The complexes [Pt(SbPh3)3]2N2, [Pt(SbPh3)3]2C2 lose N2 or the ethynediyl group at 130-150°C are transformed into [Pt(SbPh3)3].
- Barbieri, Roberto Santos,Bellato, C. R.,Massabni, A. C.
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p. 277 - 286
(2008/10/09)
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- Preparation and characterization of some mixed ligand complexes of platinum(II)
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The mixed ligand complexes PtX2(ER3)L and PtXY(ER3)L (where ER3 = PR3 or AsMe3; L = phosphine, arsine; X = Cl; Y = Cl, H or Me) have been prepared and characterized. Reaction of PtMe2(ER3)L with HCl yields PtMeCl(ER3)L, in exclusively one of three possible isomeric forms. Excess tetramethyltin reacts with Pt2Cl2(μ-Cl)2(PMe2Ph)2 giving both cis and trans Pt2(μ-Cl)2(PMe2Ph)2, as identified from the NMR spectra. Cleavage of Pt2(μ-Cl)2Me2(PMe2Ph)2 with donor ligands such as AsPh3, PMe2 or pyridine, was useful as a synthetic route to the unsymmetrical methylchloro PtII derivatives. The reaction of cis-[PtMe2(PPh3)(AsPh3)] with excess dimethylacetylenedicarboxylate (DMA) yielded only one product, which was of the formula trans-[Pt{C(COOCH3)C(COOCH3)CH3}2(PPh3)(AsPh3)], with the alkenyl groups having the same geometry about the CC bond. The use of diethylacetylene-dicarboxylate (DEA) rather than DMA gave a similar product. However, when cis-[PtMe2(PEt3)(AsPh3)] was allowed to react with DMA, two products of the formula trans-[Pt{C(COOCH3)C(COOCH3)CH3}2(PEt3)(AsPh3)] were obtained, with the stereochemistry of both alkenyl groups being either cis or trans.
- Clark, Howard C.,Goel, Anil B.,Jain, Vimal K.,Tyers, Kenneth G.,Wong, Chun S.
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p. 123 - 134
(2007/10/02)
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- Preparation, characterization, and some reactions of tri-tert-butylarsine complexes of platinum(II) and palladium(II) chlorides
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As(t-Bu)3 reacts with platinum(II) chlorides to afford either trans-PtCl2[As(t-Bu)3]2 or the dinuclear complex Pt2(μ-Cl)2Cl2[As(t-Bu)3] 2. With palladium(II) chloride, however, only the dinuclear complex Pd2(μ-Cl)2Cl2[As(t-Bu)3] 2 is formed even in the presence of excess As(t-Bu)3. These complexes undergo substitution and/or bridge-cleavage reactions with CO, py, AsPh3, Cl-, or tertiary phosphines.
- Goel, Ram G.,Ogini, William O.,Srivastava, Ramesh C.
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p. 3611 - 3616
(2008/10/08)
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