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School of Chemistry, University of Edinburgh, The King's Buildings, West Mains Road, Edinburgh, UK
E-mail: Philip.Bailey@ed.ac.uk
; Tel: +44 (0) 131 650 6448
Dalton Trans., 2013,42, 2879-2886
DOI:
10.1039/C2DT32804F
Received
23 Nov 2012,
Accepted
19 Dec 2012
First published online
19 Dec 2012
A simple and convenient route to η5-coordinated Ru and Rh aminofulvene-aldiminate (AFA) complexes is described. The metalloligands [Cp*Ru{η5-(Ph2AFAH)}][BF4] (3), [Cp*Ru{η5-(benzyl2AFAH)}][OTf] (7), [Cp*Rh{η5-(Cy2AFA)H}][BF4]2 (8) and [Cp*Rh{η5-(Cy2AFA)}][BF4] (9) have been synthesised and characterised. The basicity of 9 has been found to be significantly less than its neutral analogue and thus eliminates the need for a deprotonation step to ligate to a second metal in the κ2-N,N′-coordination mode. The reaction of 9 with a palladium precursor provides a mixed-metal complex [Cp*Rh(η5/κ2-Cy2AFA)PdCl2][BF4] (12). Cyclic voltammetry studies of the Ph2AFAH ligand shows an irreversible one electron oxidation peak at +1.0 V (vs. Fc/Fc+). Complex 3 shows an irreversible oxidation at +1.5 V and a reduction peak at −1.0 V. The oxidation of 3 occurs on the AFA ligand backbone whereas the structurally analogous neutral 1,2-bis(imidoyl)pentamethyl-ruthenocene shows reversible oxidation at the Ru center.
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