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New mixed-valence c...
New mixed-valence chromium structure type : NH4Cr(CrO4)(2)
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- Casari, B. M. (author)
- Göteborgs universitet,University of Gothenburg
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- Wingstrand, Erica (author)
- KTH,Organisk kemi,Kungliga Tekniska Högskolan (KTH),Royal Institute of Technology (KTH)
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- Langer, Vratislav, 1949 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- Elsevier BV, 2006
- 2006
- English.
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In: Journal of Solid State Chemistry. - : Elsevier BV. - 0022-4596 .- 1095-726X. ; 179:1, s. 296-301
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http://dx.doi.org/10...
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https://urn.kb.se/re...
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Abstract
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- Synthesis and crystal structure of a new structure type of mixed Cr(III)/Cr(VI) chromates is reported. NH4Cr(CrO4)(2) was prepared from CrO3 in the presence of (NH4)(2)Ce(NO3)(6). Since this is the first preparation of mixed valence ternary chromium oxides from aqueous solution, a reaction pathway for this synthesis is suggested. The crystal structure of NH4Cr(CrO4)2 has been determined from three-dimensional X-ray data collected at low temperature, 173 K. The structure belongs to the orthorhombic space group Pnma, with a = 14.5206(10), b = 5.4826(4), c = 8.7041(7) angstrom and Z = 4. The title compound consists of corner-sharing chromium(III) octahedra and chromium(VI) tetrahedra forming a three-dimensional network with the composition [Cr(CrO4)(2]n)(n-), containing channels in which zigzag rows of ammonium ions balance the net charge.
Subject headings
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
- NATURVETENSKAP -- Kemi -- Oorganisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Inorganic Chemistry (hsv//eng)
Keyword
- NH4Cr3O8
- mixed-valence ternary oxide
- mixed-valence chromate
- Cr(VI)/Ce(III) redox reaction
- X-ray diffraction
- Chemistry
- Kemi
Publication and Content Type
- ref (subject category)
- art (subject category)
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