Methylviologen cation radiacal,its dimer and complex in various media |
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| Institution: | 1. School of material engineering, Shanghai university of engineering science, Shanghai 201620, China;2. Materials Chemistry Centre, Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK;3. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China;1. Department of Mathematics, COMSATS Institute of Information Technology, Abbottabad, Pakistan;2. Department of Mathematics, Mohiud-Din Islamic University, Nerian Sharif, Azad Jammu and Kashmir, Pakistan;3. Department of Mathematics, Faculty of Sciences, HITEC University, Taxila Cantt, Pakistan;4. University of Islamabad (UoI), Islamabad, Pakistan;1. Lomonosov Moscow State University, Department of Biophysics, Faculty of Biology, 119991, Moscow, Russia;2. A.N. Bach Institute of Biochemistry, Federal Research Center of Biotechnology of the Russian Academy of Sciences, 119071, Moscow, Russia;3. Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Chunhui Rd 17, Laishan District, YanTai, China;4. Technical University of Berlin, Institute of Chemistry PC 14, Straße des 17. Juni 135, D-10623, Berlin, Germany;5. China University of Petroleum (Huadong), Qingdao, Shandong Province, China;1. Department of Oral Medicine, Oral and Maxillofacial Surgery, Tokyo Dental College, Tokyo, Japan;2. Oral Cancer Center, Tokyo Dental College, Tokyo, Japan;3. Division of Surgical Pathology, Clinical Laboratory of Ichikawa General Hospital, Tokyo Dental College, Tokyo, Japan;4. Nakamura Dental Clinic, Saitama, Japan |
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| Abstract: | Chemical, photochemical and radiolytic reduction of methylviologen, MV2+ (1,1'-dimethyl-4,4' -dipiridinum) leads to the formation of methylviologen cation radical, MV +.. It is stable in aprotic solvents, dry polymer foils and frozen aqueous solutions. In the presence of water at ambient temperatures MV+. can undergo oxidation or conversion into dimer (MV+.)2 and/or complex MV+. (MV2+). Upon freezing or addition of neutral salt, MV+. forms dimers in diluted MV2+ solutions (below 0.01 mol dm-3) while in concentrated ones (exceeding 0.05 mol dm-3) the formation of the complex prevails. Spectral and E.S.R. characteristics of MV+., its dimer and complex are given. |
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