Preparation of ammonium intercalated vanadyl phosphate by redox intercalation and ion exchange |
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| Institution: | 1. A. M. Prokhorov General Physics Institute, Russian Academy of Sciences, 119991 Moscow, Russian Federation;2. Institute of Chemistry, St. Petersburg State University, 198504 Petergof, St. Petersburg, Russian Federation;3. A. V. Shubnikov Institute of Crystallography, Russian Academy of Sciences, 119991 Moscow, Russian Federation;1. M. M. Shemyakin–Yu. A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, 117997 Moscow, Russian Federation;2. Department of Biology, M. V. Lomonosov Moscow State University, 119234 Moscow, Russian Federation;3. Higher School of Economics, 101000 Moscow, Russian Federation;1. G. A. Krestov Institute of Solution Chemistry, Russian Academy of Sciences, 153045 Ivanovo, Russian Federation;2. Research Institute of Macroheterocycles, Ivanovo State University of Chemistry and Technology, 153000 Ivanovo, Russian Federation |
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| Abstract: | Redox intercalation of NH4+ into vanadyl phosphate dihydrate (VOPO4·2H2O) leads to a two-phase (NH4)xVOPO4·H2O (x=0.2−0.9) compound with interlayer distances of 6.7 and 6.4 Å. Ammonium ions can be incorporated into the interlayer space of VOPO4 also by an ion exchange, starting from alkali-metal redox-intercalated vanadyl phosphate MexVOPO4·yH2O (Me=Li, Na, K, Rb). Several phases are formed during the ion exchange, one of them with the interlayer distance corresponding to the original MexVOPO4·yH2O phase, the second one corresponding to formed (NH4)xVOPO4·H2O. In addition, a third phase is formed by the ion exchange when Li0.98VOPO4·1.98H2O or Rb0.60VOPO4·1.3H2O are used as starting compounds. An opposite ion exchange of NH4+ for Me+ starting from (NH4)xVOPO4·H2O does not proceed. |
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