Cyclopalladated complexes containing 2-C 6 R 4 PPh 2 ligands (R = H, F): one-electron electrochemical reduction leading to metal–carbon σ-bond cleavage via palladium( i )
Data(s) |
01/01/2015
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Resumo |
Three new ortho -metallated palladium complexes, [Pd(O,O’-hfacac)(κ2-2-C6F4PPh2)] (11), [Pd2(O,O’hfacac)2(μ-2-C6F4PPh2)2](12) and [Pd(O,O’-hfacac)(κC-2-C6F4PPh2)(PPh3)] (13) (hfacac = hexafluoroace-tylacetonate), have been prepared and fully characterised. The electrochemical reductions of complexes 11–13, together with those of other cyclopalladated complexes containing 2C6R4PPh2 ligands (R = H, F) were studied by cyclic, rotating disk and microelectrode voltammetry. Evidence for the one-electron reduction of [PdI(κ2-2-C6F4PPh2)(PPh2Fc)] (6) was obtained from coulometric analysis, although the product is unstable and undergoes further chemical processes. Preparative electro-reduction of [Pd2(μ-Br)2(κ2-2-C6F4PPh2)2] (7) in CH2Cl2 causes reductive cleavage of its Pd–C σ-bonds and formation of the complex [PdBr2{PPh2(2-C6F4H)}2](14); possible mechanisms are discussed. |
Identificador | |
Idioma(s) |
eng |
Publicador |
Royal Society of Chemistry |
Relação |
http://dro.deakin.edu.au/eserv/DU:30077024/torriero-cyclopalladatedcopmlexes-2015.pdf http://www.dx.doi.org/10.1039/C4DT03268C |
Direitos |
2015, Royal Society of Chemistry |
Tipo |
Journal Article |