European Journal of Inorganic Chemistry

Cover image for Vol. 2017 Issue 27

Editor: Karen Hindson, Deputy Editor: Preeti Vashi

Impact Factor: 2.444

ISI Journal Citation Reports © Ranking: 2016: 13/46 (Chemistry Inorganic & Nuclear)

Online ISSN: 1099-0682

Associated Title(s): Angewandte Chemie International Edition, Chemistry - A European Journal, Chemistry – An Asian Journal, ChemistryOpen, ChemCatChem, Zeitschrift für anorganische und allgemeine Chemie

2010_12/2010Half-Sandwich Benzylidene Ruthenium Complexes Bearing Phosphanyl-Pyridine Ligands: Reactivity towards Nucleophiles and Electrophiles (Eur. J. Inorg. Chem. 12/2010)

The cover picture shows various reactions of the carbene complex [Ru(η5-C5Me5){κ2-P,N-PiPr2NHC5H4N}(=CHC6H5)]+ over a view of Cádiz (phoenician Gadir), one of the oldest european continuously inhabited cities. These processes illustrate its ambiphilic character. It reacts as a nucleophile with Brønsted acids, yielding a complex with an η2-benzyl ligand. There are some previously described examples of this coordination mode for early transition metal benzylidene complexes, but this represents the first example of a structural characterization in the case of ruthenium complexes. The electrophilic behaviour of [Ru(η5-C5Me5){κ2-P,N-PiPr2NHC5H4N}(=CHC6H5)]+ has been shown by reaction with hydride, giving rise to an η1-benzyl complex. Normally, NMR studies allow unambiguous characterization of the η1 coordination of a benzyl ligand. However, especially for late transition metal complexes, distinction between the usually disregarded η2 and the generally considered η3 mode is difficult. We propose, from this study, that the presence of an η2-benzyl ligand in metal complexes should not be ruled out only on the basis of their NMR spectra. The carbene complex also reacts with other bases like KOtBu, KN(SiMe3)2 and PMe3. Details are discussed in the article by I. Macías-Arce, M. C. Puerta and P. Valerga on p. 1767 ff.

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