Cobalt(II) chloride complexes in molten acetamide |
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| Affiliation: | 1. Chemistry Department, Institute of Nuclear Sciences “Vinča” P.O. Box 522, 11001 Belgrade, Yugoslavia;2. Chemistry Department, The University, Southampton, SO9 5NH, UK;1. Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, 518055, China;2. Institute of Nuclear Sciences Vinča, University of Belgrade, Belgrade, 11351, Serbia;1. School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;2. Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China;3. Key Laboratory of Microorganism Application and Risk Control of Shenzhen, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China;1. Vinča Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522, 11001 Belgrade, Serbia;2. Department of Chemistry, Biochemistry and Environmental Protection, Faculty of Sciences, University of Novi Sad, Trg D. Obradovića 3, 21000 Novi Sad, Serbia;1. University of Belgrade–Vinča Institute of Nuclear Sciences, P.O. Box 522, 11001 Belgrade, Serbia;2. Helmholtz–Zentrum Berlin für Materialien und Energie GmbH, D–14109 Berlin, Germany;3. University of Belgrade–Institute of Physics, Pregrevica 118, 11000 Belgrade, Serbia;1. Institute of Nuclear Sciences “Vinča”, University of Belgrade, Serbia;2. Joint Institute for Nuclear Research, Dubna, Russia;3. Faculty of Physics, University of Belgrade, Serbia |
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| Abstract: | The absorption spectra of Co(II) chloride species were studied in molten acetamide containing variable concentration of chloride ligand, in the wavelength range 400–800 nm, at 90°C. The stepwise formation of CoClj(2-j) complexes (J = 1–4) was observed. Addition of chloride ligand (up to 4 molar) dramatically changed Co(II) absorption spectra due to change in co-ordination from octahedral through a severely distorted octahedral to tetrahedral co-ordination. Overall equilibrium constants βj and consecutive stability constants Kj(j = 1–4) were calculated using SPELMA program for simultaneous computation of equilibrium constants and molar absorption coefficients for each complex species. Distribution of the Co(II) species was also calculated in the studied ligand concentration range. |
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