Electrochemical Study of Alkynyl Fe(II) Complexes

Ana I.F. Venâncio,^a Luísa M.D.R.S. Martins^a,b Armando J.L. Pombeiro^{a *}

^a) Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.

^b)Secção de Química Inorgânica, DEQ, ISEL, R. Conselheiro Emídio Navarro, 1949-014 Lisboa, Portugal

Received 10 September 2002; accepted in revised form 14 January 2003

Abstract

The behaviour of the neutral alkynyl complexes trans-[FeBr(L)(depe)₂] (L = -C=C-C(=CH₂)Ph 1a, -C=C-CPh₂(H) 1b; depe = Et₂PCH₂CH₂PEt₂) is studied by cyclic voltammetry and the electrochemical P_L and E_L ligand parameters for the alkynyl ligands are estimated showing that they behave as very strong net electron-donors.

Keywords: alkynyl, anodic behaviour, electrochemical ligand parameters, cyclic voltammetry.

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