Electrochemical characterization of the host-guest nanocomposite material MCM-41-based iron and ruthenium complexes with bipyridine and phenanthroline

Synthesis and characterization of host-guest nanocomposite materials MCM-41 -based [Fe(phen)(3)](2+), [Fe(bpy)(3)](2+), [Ru(bpy)(3)](2+), and [Ru(bpy)( 2)Cl-2](+) (where phen = 1,10-phenanthroline and bpy = 2,2'-bipyridine) and studied. Powder X-ray diffraction, FTIR spectrometry, and cyclic voltammet ry are used to characterize the prepared nanocomposite materials. The cycli c voltammograms for the complexes dissolved in aqueous solution at glassy c arbon electrode yield only a well-defined pair of peaks attributable to the well-known monoelectronic redox processes. The cyclic voltammograms for th e MCM-41-based complexes-modified glassy carbon electrode yield three well- defined pairs of peaks attributable to the monoelectronic redox processes o f complexes with various coordination numbers. preliminary experimental res ults of cyclic voltammetry and LR spectrometry demonstrate that the silanol groups within the MCM-41 possess the active sites for adsorption of pyridi ne ring in ligand, and can be used as a li,ligand to coordinate with the ce ntral ion, as well as enable original complexes to be partly dissociated. ( C) 2000 Published by Elsevier Science S.A. All rights reserved.