Thesis Title

The Effects Of Nonionic Surfactant Chain Length On The Tris(2,2'-Bipyridyl) Ruthenium(Ii)-Tripropylamine Electrochemiluminescence System

Date of Graduation

Spring 2001

Degree

Master of Science in Chemistry

Department

Chemistry

Committee Chair

Mark Richter

Subject Categories

Chemistry

Abstract

The effects of nonionic surfactants on the properties of tris(2,2'-bipyridyl)ruthenium(II) (Ru(bpy)₃⁺² where bpy = 2,2' bipyridine) electrochemiluminescence (ECL) have been investigated. The electrochemistry, photophysics and ECL of Ru(bpy)₃⁺² in the presence of a series of Triton X nonionic surfactants are reported (Triton X-100, 114, 165, 405, 305, and 705-70). These surfactants differ in the number of polyethylene oxide units incorporated into the surfactant molecule. The anodic oxidation of Ru(bpy)₃⁺² produces ECL in the presence of tri-n-propylamine (TPA) in both aqueous and surfactant solution. Increases in ECL efficiency, duration of the ECL signal and TPA oxidation current have been observed in surfactant media dependent on the nature of the nonionic surfactant. The data supports adsorption of surfactant on the electrode surface. The adsorption of the surfactant species renders the electrode more hydrophobic and facilitates (TPA) and Ru(bpy)₃⁺² oxidation, leading to higher ECL intensities. These increases in ECL efficiency should allow one to improve the detection sensitivity in analytical systems that incorporate Ru(bpy)₃⁺² / TPA.

Copyright

© Bridgette Factor

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