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New octahedral rhenium(I) tricarbonyl amido complexes

Hevia, E and Perez, J and Riera, V and Miguel, D (2002) New octahedral rhenium(I) tricarbonyl amido complexes. Organometallics, 21 (9). pp. 1966-1974. ISSN 0276-7333

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Abstract

Several new Re(I) octahedral amido complexes fac-[Re(NRR')(CO)(3)(N-N)1 (R = aryl; R' = H, aryl; N-N = 2,2-bipyridine, bipy; 1,10-phenanthroline, phen) have been synthesized either by reaction of [Re(OTf)(CO)(3)(N-N)] precursors with potassium amides or by deprotonation of [Re(NH2Ar)(CO)(3)(N-N)OTf compounds, in turn obtained by reaction of [Re(OTf)(CO)(3)(N-N)] compounds with amines. The structure of the amido complexes [Re(NHPh)(CO)3(bipy)] (5) and [Re(NPh2)(CO)(3)(bipy)] (6) have been determined by single-crystal X-ray diffraction. The results, coupled with the solution NMR behavior of the complexes, indicate that the delocalization of the nitrogen lone pair of the amido group involves mainly the N-aryl bonds. Amido complexes [Re(NEp-Tol)(CO)(3)(N-N)] (4a,b) (p-Tol = 4-methylphenyl) react with 4-ethylphenol, with ethanothiol, and with diphenylphosphine to give the complexes [Re(OC6H4-4-C2H5)(CO)(3)(bipy)] (8), [Re(SCH2CH3)(CO)(3)(bipy)] (9), and [Re(PPh2)(CO)(3)(N-N)] (10a,b). The structure of the diphenylphosphido complex [Re(Ph-2)(CO)(3)(phen)] (10b), determined by X-ray diffraction, was compared with the structure of the homologous diphenylamido complex 6. The different geometries (pyramidal phosphorus and planar amido nitrogen) correlate with the higher nucleophilicity of the phosphido complex.

Item type: Article
ID code: 34756
Keywords: transition-metal chemistry, carbonyl-diimine complexes, ligands, photoinduced reduction, reactivity, Chemistry, Organic Chemistry, Physical and Theoretical Chemistry, Inorganic Chemistry
Subjects: Science > Chemistry
Department: Faculty of Science > Pure and Applied Chemistry
Related URLs:
    Depositing user: Pure Administrator
    Date Deposited: 21 Oct 2011 13:10
    Last modified: 05 Sep 2014 12:19
    URI: http://strathprints.strath.ac.uk/id/eprint/34756

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