Photoionization of Ru(bpy)32+ ions in aqueous solutions containing sodium dodecyl sulfate. Influence of ion binding |
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| Institution: | 1. Applied Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India;2. Bereich Physikalische Chemie, Hahn-Meitner-Institut, Glienicker Str. 100, D-14109 Berlin, Germany;1. Department of Polymeric Materials, School of Materials Science and Engineering, Tongji University, 4800 Caoan Road, Shanghai 201804, China;2. Shanghai Tenth People''s Hospital, Tongji University, 301 Middle Yanchang Road, Shanghai 200072, China;1. College of Food and Biological Engineering, Qiqihar University, Qiqihar, Heilongjiang, 161006, China;2. Department of Plant, Food & Environmental Sciences, Dalhousie University, Truro, NS, B2N 5E3, Canada |
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| Abstract: | Sodium dodecyl sulfate (SDS) augments the yield of biphotonic ionization of tris-2,2′-bipyridyl ruthenium(II) ions (3.75×10?5 mol dm?3) in aqueous solution at room temperature to different extents at two different concentration ranges: by a factor 4 at SDS] just below the critical concentration for precipitation (4.5×10?4 mol dm?3) and by a factor 1.4 at SDS] above the critical micellar concentration (8×10?3 mol dm?3). The augmentation of the photoionization yield is explained in terms of ion binding, i.e. electrostatic interaction between Ru(bpy)32+ ions and dodecyl sulfate ions which results in a partial charge neutralization with the consequence of a decrease in the ionization potential. |
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