Crystal Structure and Characterisation of Mercury(II) Dichromate(VI)

Dark-red single crystals of HgCr2O7 were grown by reacting HgO and CrO3 in excess at 200°C for four days. The crystal structure (space group P32, Z = 3, a = 7.2389(10), c = 9.461(2) A, 1363 structure factors, 57 parameters, R[F2>2σ(F2)] = 0.0369, wR(F2 all) = 0.0693) was determined from a crystal...

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Autores principales: Weil, Matthias, Stöger, Berthold, Zobetz, Erich, Baran, Enrique José
Formato: Articulo
Lenguaje:Inglés
Publicado: 2006
Materias:
Química
Ciencias Exactas
Crystal structure
Dichromates(VI)
Mercury(II)
Thermal behaviour
Vibrational spectroscopy
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/139264
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-139264
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Química
Ciencias Exactas
Crystal structure
Dichromates(VI)
Mercury(II)
Thermal behaviour
Vibrational spectroscopy
spellingShingle Química
Ciencias Exactas
Crystal structure
Dichromates(VI)
Mercury(II)
Thermal behaviour
Vibrational spectroscopy
Weil, Matthias
Stöger, Berthold
Zobetz, Erich
Baran, Enrique José
Crystal Structure and Characterisation of Mercury(II) Dichromate(VI)
topic_facet Química
Ciencias Exactas
Crystal structure
Dichromates(VI)
Mercury(II)
Thermal behaviour
Vibrational spectroscopy
description Dark-red single crystals of HgCr2O7 were grown by reacting HgO and CrO3 in excess at 200°C for four days. The crystal structure (space group P32, Z = 3, a = 7.2389(10), c = 9.461(2) A, 1363 structure factors, 57 parameters, R[F2>2σ(F2)] = 0.0369, wR(F2 all) = 0.0693) was determined from a crystal twinned by merohedry according to (110). It consists of nearly linear HgO2 units (\({\bar {d}}\)(Hg–O) = 2.02 A) and dichromate units that are linked into infinite chains ‘O3Cr–O–CrO3–Hg–O3Cr–O–CrO3’ running parallel to the c-axis. Six additional Hg–O contacts between 2.73 and 2.96 A stabilise the structural arrangement. The dichromate anion exhibits a staggered conformation with a bent Cr–O–Cr bridging angle of 140.7(6)°. Upon heating above 300°C, HgCr2O7 decomposes in a two-step mechanism to Cr2O3. The title compound was additionally characterised by vibrational spectroscopy.
format Articulo
Articulo
author Weil, Matthias
Stöger, Berthold
Zobetz, Erich
Baran, Enrique José
author_facet Weil, Matthias
Stöger, Berthold
Zobetz, Erich
Baran, Enrique José
author_sort Weil, Matthias
title Crystal Structure and Characterisation of Mercury(II) Dichromate(VI)
title_short Crystal Structure and Characterisation of Mercury(II) Dichromate(VI)
title_full Crystal Structure and Characterisation of Mercury(II) Dichromate(VI)
title_fullStr Crystal Structure and Characterisation of Mercury(II) Dichromate(VI)
title_full_unstemmed Crystal Structure and Characterisation of Mercury(II) Dichromate(VI)
title_sort crystal structure and characterisation of mercury(ii) dichromate(vi)
publishDate 2006
url http://sedici.unlp.edu.ar/handle/10915/139264
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AT stogerberthold crystalstructureandcharacterisationofmercuryiidichromatevi
AT zobetzerich crystalstructureandcharacterisationofmercuryiidichromatevi
AT baranenriquejose crystalstructureandcharacterisationofmercuryiidichromatevi
bdutipo_str Repositorios
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