A Search for the Influence of the Electronic Characteristics of the Camphor Derived Ligands and Complexes on their Redox Properties

M. Fernanda, N.N. Carvalho*

CQE, Complexo I, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal

 

Received 16 September 2003; accepted in revised form 9 October 2003

 

Abstract

The electrochemical data obtained by cyclic voltammetry on several camphor-type (A, B and C) ligands and derived complexes are revised. A direct positive correlation is established between the redox potentials (anodic or cathodic) of the camphor species and the σp-Hammett parameter of the R group on the camphor skeleton. A study of the effect of the ligand on the redox properties of some Pd, Pt or Cu camphor complexes shows that the ligands influence either the anodic or cathodic processes but the characteristics of the metal drive the potential values.

 

Keywords: Camphor ligands, complexes, redox properties, electronic properties.

 

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References

1. M.F.N.N. Carvalho, L.M.G. Costa, A.J.L. Pombeiro, A. Schier, W. Scherer, S.K. Harbi, U. Verfürth, R. Herrmann, Inorg.Chem. 33 (1994) 6270.        [ Links ]

2. M.F.N.N. Carvalho, A.C. Consiglieri, M.T. Duarte, A.M. Galvão, A.J.L. Pombeiro, R. Herrmann, Inorg.Chem. 32 (1993) 5160.         [ Links ]

3. B.L. Shaw, N. Iranpoor, S.D. Perera, M. Thornton-Pett, J.D. Vessey, J.Chem. Soc., Dalton Trans, (1998) 1885.         [ Links ]

4. X. Verdaguer, J. Vásquez, G. Fuster, V. Bernardes-Génisson, A. Greene, A. Moyano, M. Pericàs, A. Riera, J.Organometal. Chem. 63 (1998) 7037.        [ Links ]

5. R.J. Cross, L.J. Farrugia, P.D. Newman, R.D. Peacock, D. Stirling, J.Chem. Soc., Dalton Trans, (1996) 4149.        [ Links ]

6. R. Clark, M. Gahagan, R.K. Mackie, D.F. Foster, D.J. Cole-Hamilton, M. Nicol, A.W. Montford, J.Chem. Soc., Dalton Trans. (1995) 1221.        [ Links ]

7. M.F.N.N. Carvalho, R. Herrmann, B. Pedersen, A.J.L. Pombeiro, G.Wagner, Z. Naturforschung, 54b (1999) 725.         [ Links ]

8. M.F.N.N. Carvalho, F.M.T. Almeida, A.M. Galvão, A.J.L. Pombeiro, J. Organometal. Chem., 679(1) (2003) 142.        [ Links ]

9. M.F.N.N. Carvalho, A.J.L. Pombeiro, R. Herrmann, Port. Electroch. Acta14 (1996) 173.        [ Links ]

 

^*Corresponding author. E-mail address: fcarvalho@ist.utl.pt