Effect of temperature on the absorption spectra of the solvated electron in 1-propanol and 2-propanol: Pulse radiolysis and laser photolysis studies at temperatures up to supercritical condition |
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| Institution: | 1. Department of Nuclear Engineering and Management, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;2. Nuclear Professional School, School of Engineering, The University of Tokyo, 2-22 Shirakata Shirane, Tokaimura, Nakagun, Ibaraki 319-1188, Japan;3. Advanced Science Research Center, Japan Atomic Energy Agency, 2-4 Shirakata Shirane, Tokaimura, Nakagun, 319-1195 Ibaraki, Japan;1. Center for Computational and Integrative Biology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts;2. Broad Institute of Massachusetts Institute of Technology and Harvard University, Cambridge, Massachusetts;3. Gastrointestinal Unit and Center for the Study of Inflammatory Bowel Disease, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts;1. Institute of Environmental Science, College of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, PR China;2. Department of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing, Fuling 408100, PR China;3. Department of Chemistry and Institute of Advanced Materials, Hong Kong Baptist University, Hong Kong SAR, PR China;1. Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada del Instituto Politécnico Nacional, Unidad Legaria, Calzada Legaria 694. Col. Irrigación, C.P. 11500 Cd. de México, México;2. Departamento de Física de Materiales, Facultad de Ciencias, Universidad Autónoma de Madrid, C/Francisco Tomás y Valiente 7, 28049 Madrid, Spain;3. Departamento de Física, MALTA Consolider Team and Instituto de Materiales y Nanotecnología (IMN), Universidad de La Laguna, 38206 Tenerife, Spain |
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| Abstract: | The absorption spectra of solvated electrons in 1-propanol and 2-propanol have been investigated from 22 to 270 °C at a fixed pressure of 7 MPa, by using both nanosecond pulse radiolysis and laser photolysis techniques. The results show that, even up to supercritical conditions, it is still possible to measure unambiguously the absorption spectra of solvated electron in these two propanols. The peak positions of the absorption spectra show a red-shift (shifts to longer wavelengths) as temperature increases, similar to water and other alcohols, but the temperature efficiency, dEmax/dT, of 1-propanol is larger than that of 2-propanol. In addition, in clear contrast to that of pulse radiolysis, in laser photolysis experiments, an increase in the maximum absorbance of the absorption spectra of solvated electron with temperature up to ∼200 °C is attributed to the increase of absorbance (CTTS absorption band) of I− anion at 248 nm with increasing temperature. |
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