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- W2317264069 abstract "Bis-triphenylphosphonio-isophosphindolide salts 1[X] react with Cu(I)-halides CuX to give isolable products of composition [(1)Cu 2 X 3 ]. X-ray crystal structure analyses confirmed that for X = Br, Cl dinuclear complexes [(μ-1 )(μ-X)Cu 2 X 2 ] with μ 2 , η 1 (P)-bridging cations 1 are formed, while for X = I a solid phase containing a salt (1) 2 [Cu 4 I 6 ] and a complex [(1) 2 Cu 4 I 6 ] with a terminal η 1 (P)-coordinated ligand 1 was obtained. The bonding parameters in the two types of complexes suggest that l i s a hybrid between a phosphenium cation and a phospholide anion whose π-system is less nucleophilic than the phosphorus lone-pair. 31 P NMR studies revealed that in solution in all cases binuclear complexes [(1)Cu 2 X 3 ] are in dynamic equilibrium with small amounts of mononuclear species and free 1. The same equilibria were detected in the system 1[OTf]/CuOTf. NMR studies of ligand exchange reactions indicated that the stability of complexes [(1)Cu 2 X 3 ] increases in the order X = OTf < I < Br, Cl, and titration of [(1)Cu 2 Br 3 ] with Et 4 NBr allowed to determine the equilibrium constant of the complex formation reaction." @default.
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- W2317264069 date "1999-10-01" @default.
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- W2317264069 title "Bis-phosphonio-isophosphindolide Copper Complexes" @default.
- W2317264069 doi "https://doi.org/10.1515/znb-1999-1005" @default.
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