Applications of electron spin echo spectroscopy to location control of alkylphenothiazine derivatives in photoinduced charge separation across vesicles,micelles and reverse micelle interfaces |
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| Institution: | 1. Department of Man-Made Fibres, Lodz University of Technology, Poland;3. Institute of Materials Science and Engineering, Lodz University of Technology, Lodz, Poland;4. Institute of Architecture of Textiles, Lodz University of Technology, Poland;1. Chemistry Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia;2. Center of Excellence for Advanced Materials Research, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia;1. Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, 1206 W. Green St., Urbana, IL, 61801, USA;2. Department of Mechanical Engineering, American University of Sharjah, PO Box 26666, Sharjah, United Arab Emirates;3. Advanced Materials Group (AMG), Department of Mechanical Engineering, Koç University, 34450, Istanbul, Turkey |
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| Abstract: | The efficiency of photoinduced charge separation across surfactant interfaces of micelles and vesicles depends in part on the location of electron donors and acceptors relative to the interface. Achievement and assessment of control of such location by the addition of pendant alkyl chains to donors and acceptors is shown to be achievable. The net photoionization efficiency can be measured by electron spin resonance of radical ions in frozen surfactant solutions. Assessment of relative locations of radical ions with respect to a surfactant interface has been achieved by analysis of electron spin-echo modulation from deuterium in deuterated water at the interface.Results for a series of positive, neutral and negatively charged alkylphenothiazine derivatives in vesicle, micelle and reverse micelle surfactant assemblies of different interface charge are discussed. Controlling factors involve the alkyl chain length of the electron donors, the relative charge of the surfactant assembly interface versus that of the electron donor derivative, and the degree of molecular order in the interface. Secondary factors include alkyl chain bending, photoinduced radical conversion and back electron transfer. |
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