Département de chimie moléculaire

The authors report the synthesis and electrochem. characterization of a novel electropolymerizable Ru(II) complex contg. two phenanthrolinequinone ligands, RuII(PhQ)2(bpy-pyrrole)(PF6)2. This complex was electropolymd. on glassy carbon (GC) and multiwalled carbon nanotube (MWCNT) electrodes. Higher apparent surface concns. (80 nmol cm-2) were obtained on MWCNTs than on GC electrodes and correspond to ∼1000 equiv compact monolayers of Ru complex. Moreover, the nanostructured metallopolymer exhibits efficient electrocatalytic properties toward oxidn. of NADH. This metallopolymer can be electrogenerated in water from the adsorbed Ru(II) monomer. This property was applied to the immobilization of enzymes by coadsorption of Ru complex and enzyme and then electropolymn. of coatings. This two-step procedure leads to the entrapment of 70{%}-90{%} of the deposited amt. of enzyme in poly-RuII(PhQ)2(bpy-pyrrole) films. Glucose dehydrogenase (GDH) was thus efficiently immobilized in the electrogenerated polymer matrix. In presence of NAD+ (10 mM), the resulting enzyme electrode exhibits high current densities for glucose oxidn. of 1.04 mA cm-2 at low overpotentials (-0.1 V) with a detection limit of 1 $μ$M of glucose. [on SciFinder(R)]