Electrochemistry and Photocurrents of the Tris(bipyridine)ruthenium(II) and Methyl Viologen Cations Immobilized in Carrageenan Hydrogel

Journal Article (Journal Article)

A procedure for immobilization of both a photochromophore, tris(2,2′-bipyridine)ruthenium(II) (Ru(bpy) ), and a quencher, methyl viologen (MV ), within a carrageenan hydrogel matrix at an electrode surface is described. Ru(bpy) and MV exhibited diffusion coefficients that ranged from 10 to 10 cm /s in the hydrogel, which represents an improvement over other immobilization matrices. Photolysis of the resulting hydrogel surface modified electrodes gave rise to a significant photocurrent which depended on the concentrations of Ru(bpy) , MV , and triethanolamine and resulted in a maximum value of 12 μA/cm after the hydrogel was cured with a solution containing 5 mM Ru(bpy) and 50 mM MV . The photocurrent was the result of reoxidation of MV at the electrode surface following reduction of MV by photoexcited Ru(bpy) . The quenching rate constant of Ru(bpy) * by MV in the hydrogel was 4.2 X 10 M s . The photocurrent action spectrum was consistent with Ru(bpy) acting as the photochromophore. Offsetting the potential of the hydrogel electrode verified the role of the MV redox couple as the source of the current. © 1991, American Chemical Society. All rights reserved. 3 3 3 3 3 3 3 2+ 2+ 2+ 2+ -7 -6 2 2+ 2+ 2 2+ 2+ + 2+ 2+ 2+ 2+ 8 -1 -1 2+ 2+/+

Full Text

Duke Authors

Cited Authors

  • Rillema, DP; Edwards, AK; Perine, SC; Crumbliss, AL

Published Date

  • November 1, 1991

Published In

Volume / Issue

  • 30 / 23

Start / End Page

  • 4421 - 4425

Electronic International Standard Serial Number (EISSN)

  • 1520-510X

International Standard Serial Number (ISSN)

  • 0020-1669

Digital Object Identifier (DOI)

  • 10.1021/ic00023a026

Citation Source

  • Scopus