Thermodynamic studies on complexation of pervanadyl ion with aminopolycarboxylates |
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| Affiliation: | 1. INDUROT, Environmental Technology, Biotechnology, and Geochemistry Group, Universidad de Oviedo, Campus de Mieres, 33600 Mieres, Asturias, Spain;2. Instituto Politécnico de Castelo Branco, 6001-909 Castelo Branco, Portugal;3. CERENA Research Center, University of Lisbon, Portugal;4. Department of Natural Resources and Environmental Engineering, Univ. of Vigo, Lagoas Marcosende, 36310 Vigo, Spain;5. Departamento de Transportes, Tecnología de Procesos y Proyectos, Universidad de Cantabria, Campus de Torrelavega, 39300 Torrelavega, Cantabria, Spain;1. Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China;2. Key Laboratory of Alpine Ecology and Biodiversity, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China;3. University of Chinese Academy of Sciences, Beijing 100101, China;4. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China;5. Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resource Research, Chinese Academy of Sciences, Beijing 100101, China;6. School of Geography & Development, Udall Center for Studies in Public Policy, University of Arizona, Tucson, AZ 85719, USA;7. MOE Key Laboratory for Urban Transportation Complex Systems Theory and Technology, Beijing Jiaotong University, Beijing 100044, China |
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| Abstract: | The solution equilibria of the vanadium(V) complexes formed by N-methyliminodiacetic acid (MIDA), nitrilotriacetic acid (NTA) and ethylenediamine-N,N′-diacetic acid (EDDA) were investigated spectrophotometrically. In acidic media all three complexes have the same formula as VO2Y, where Y represents aminopolycarboxylate anion. In alkaline media these complexes dissociate yielding HVO42− and Y. The formation constants of 1:1 complexes (log KVO2Y: 10·16 ± 0·12 for MIDA; 13·8 ± 0·4 for NTA; 14·5 ± 0·3 for EDDA at 25°C and I = 1·0 M) point to a cis configuration of the two oxygen atoms in the VO2 unit. The protonation constants of aminopolycarboxylates were also determined potentiometrically. |
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