Issue 2, 2013
From the journal:

Analyst

Insights into electrochemiluminescent enhancement through electrode surface modification†

Emmet J. O'Reilly,b   Tia E. Keyes,b   Robert J. Forster*b  and  Lynn Dennany*ab  

* Corresponding authors

a Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, UK
E-mail: lynn.dennany@strath.ac.uk
Fax: +44 (0)141 548 2535
Tel: +44 (0)141 548 4322

b National Centre for Sensors Research, School of Chemical Sciences, Dublin City University, Dublin 9, Ireland
E-mail: Robert.Forster@dcu.ie
Fax: +353 1 700 5503
Tel: +353 1 700 5943

Abstract

The electrochemiluminescent (ECL) properties of a luminescent metal centre, [Ru(bpy)3]2+, can be significantly modulated through its electronic interaction with neighbouring centres and the polymer backbone used to confine it on an electrode surface. From the perspective of ECL based sensing devices, an increase in the ECL efficiency of a metallopolymer film can result in enhanced sensor sensitivity and selectivity. This work probes the ECL properties of both conjugated, [Ru(bpy)2(PPyBBIM)10]2+, and non-conjugated, [Ru(bpy)2(PVP)10]2+, ruthenium based metallopolymer films based on a well documented reaction with sodium oxalate, where bpy is 2,2′-bipyridyl, PPYBBIM is poly[2-(2-pyridyl)-bibenzimidazole] and PVP is poly(4-vinylpyridine). Through a combination of ground state electrochemical studies and ECL measurements, the ECL efficiency for each film is determined. This study reveals that despite a dramatic influence in charge transfer rates between metal centres, as observed for the conducting polymer, mediated through the conducting polymer backbone, a corresponding increase in ECL efficiency is not always observed. The degree of communication between the adjacent excited state metal centres are an important consideration for ECL enhancement however self quenching, luminophore distribution and film porosity must also be considered.

Graphical abstract: Insights into electrochemiluminescent enhancement through electrode surface modification

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Article information

DOI
https://doi.org/10.1039/C2AN36045D
Article type
Paper
Submitted
31 Jul 2012
Accepted
22 Nov 2012
First published
22 Nov 2012

Analyst, 2013,138, 677-682

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Insights into electrochemiluminescent enhancement through electrode surface modification

E. J. O'Reilly, T. E. Keyes, R. J. Forster and L. Dennany, Analyst, 2013, 138, 677 DOI: 10.1039/C2AN36045D

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