Département de chimie moléculaire

A simple electrochem. procedure to tailor very robust thin films contg. the Fe(bpy)32+-like core (bpy = 2,2'-bipyridine) is described. The procedure is based on the electroreductive pptn. of sol. macromols. prepd. in situ by simply mixing Fe2+ ions as the perchlorate salt and alkyl bridged bis-bipyridyl ligands Ln (n = 2, 4, 6 for alkyl chain-(CH2)-) in MeCN. NMR analyses showed that this soln. contains mainly oligomeric species but also a small amt. (∼5{%}) of low wt. dinuclear [FeII2(Ln)3]4+ complex. The poor soly. of the reduced forms of the oligomers causes pptn. and adsorption on the electrode surface of thin films. These films exhibit an excellent stability esp. when they are cycled over the Fe oxidn. redox system ({\textless}5{%} loss after 80 subsequent scans). This is due to the very slow redissoln. of the oxidized films. [on SciFinder(R)]