New mixed-valence chromium structure type: NH4Cr(CrO4)(2)

New mixed-valence chromium structure type : NH4Cr(CrO4)(2)

Wingstrand, Erica (author): KTH,Organisk kemi,Kungliga Tekniska Högskolan (KTH),Royal Institute of Technology (KTH)

Langer, Vratislav, 1949 (author): Chalmers tekniska högskola,Chalmers University of Technology

(creator_code:org_t)

Elsevier BV, 2006
2006
English.
In: Journal of Solid State Chemistry. - : Elsevier BV. - 0022-4596 .- 1095-726X. ; 179:1, s. 296-301

Related links:: http://dx.doi.org/10...; show more...; https://urn.kb.se/re...; https://doi.org/10.1...; https://research.cha...; show less...

Abstract Subject headings

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.

By the author/editor: Casari, B. M.; Wingstrand, Eric ...; Langer, Vratisla ...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Inorganic Chemis ...

By the university: Royal Institute of Technology; Chalmers University of Technology

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