Date of Graduation

Spring 2012

Degree

Master of Science in Chemistry

Department

Chemistry

Committee Chair

Mark Richter

Keywords

electrogenerated chemiluminescence, ionic liquids, ECL enhancement, electrochemistry, phosphorescence

Subject Categories

Chemistry

Abstract

The electrochemistry, UV-visible absorption, photoluminescence (PL), and electrogenerated chemiluminescence (ECL) of Ru(bpy)32+ (where bpy = 2,2'-bipyridine), (bpy)2Ru(DM-bpy)2+ (DM-bpy = 4,4'-dimethyl-2,2'-bipyridine), and (bpy)2Ru(DC-bpy)2+ (DC-bpy = 4,4'-dicarboxy-2,2'-bipyridine) have been obtained in aqueous solution containing ionic liquids (ILs). Tri-n-propylamine (TPrA) was used as the oxidative-reductive ECL coreactant. Minor shifts in the RuII/RuIII oxidation potential and no shifts in the UV-visible absorbance and photoluminescence emission maxima were observed in the presence of the IL 1-ethyl-3-methylimidazolium ethylsulfate ([emim][EtSO4]). However, dramatic increases in ECL intensities between 2.4- and 3.5-fold were observed when [emim][EtSO4] was present for ruthenium systems while both enhancement and attenuation of the ECL intensity were observed when a series of butyl-imidazolium ILs were studied. Experiments indicate that the adsorption of the IL occurs at the electrode surface, favoring the co-localization of luminophore and coreactant within the adsorbate layer, leading to changes in ECL intensities.

Copyright

© Jared Franklin Roop

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