Elisabete C.B.A. Alegria,^a,b,* Sónia M.P.R.M. Cunha,^a Luísa M.D.R.S. Martins,^a,b M. Fátima C. Guedes da Silva,^a,c Armando J.L. Pombeiro^a

^aCentro de Química Estrutural, Complexo I, Instituto Superior Técnico, Av. Rovisco Pais,

1049-001 Lisboa, Portugal.

^bSecção de Química Inorgânica, DEQ, Instituto Superior de Engenharia de Lisboa, R. Conselheiro Emídio Navarro, 1949-014 Lisboa, Portugal.

^cUniversidade Lusófona de Humanidades e Tecnologias, Campo Grande 376, 1749-024, Lisboa, Portugal.

Received 27 October 2003; accepted 25 November 2003

Abstract

The bis(cyanoimide) complex trans-[Mo(NCN)₂(dppe)₂] (dppe = Ph₂PCH₂CH₂PPh₂) is susceptible of electrophilic attack to form the acylated and aroylated derivatives trans-[MO(NCN){NCNC(O)R}(dppe)₂]Cl (R = Et 2a or Ph 2b). Herein, we report a preliminary study on the electrochemical behaviour of complexes 2 and the derivative trans-[Mo(NCN)Cl(dppe)₂][BF₄] 3, as investigated by cyclic voltammetry (CV) and controlled-potential electrolysis (CPE), what has allowed a comparison of the electron-donor ability of the ligands.

Keywords:Molybdenum complexes, cyanoimide complexes, acylation, aroylation, derivative, electrophilic attack, electron richness.

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^*Corresponding author. E-mail address: ebastos@deq.isel.ipl.pt