CuBrSe2: A metastable compound in the system CuBr/Se

Arno Pfitzner, Tom Nilges, Hans Jörg Deiseroth

Publikation: Beitrag in FachzeitschriftArtikelBegutachtung

19 Zitate (Scopus)

Abstract

Metastable CuBrSe2 was prepared by the fast cooling of a melt (T ≥ 400 °C) of copper(I) bromide and selenium in the ratio 1:2 to room temperature. The crystal structure was determined from single crystals separated from the solidified melt. The compound crystallizes isotypic to CuXTe2 (X = Cl, Br, I) and CuClSe2, space group P21/n (No. 14) with a = 7.8838(9) Å, b = 4.6439(4) Å, c = 11.183(1) Å, β = 103.44(1)°, V = 398.2(1) Å3, and Z = 4. The refinement converged to R = 0.0424 and wR = 0.0851 (all reflections), respectively. In the crystal structure formally neutral one-dimensional selenium chains 1[Se] are coordinated to copper(I) bromide. Slow cooling of the melt or heating of solid CuBrSe2 to 250 °C for some hours results in the decomposition of the compound, and a mixture of CuBrSe3 and CuBr is formed. DSC measurements indicate, that this decomposition starts at about 200 °C. Nevertheless, a melting point of 342 °C can be determined. In Raman spectra of CuBrSe2, selenium-selenium stretching modes are found at νSe-Se = 241 and 219 cm-1.

OriginalspracheEnglisch
Seiten (von - bis)201-206
Seitenumfang6
FachzeitschriftZeitschrift fur Anorganische und Allgemeine Chemie
Jahrgang625
Ausgabenummer2
DOIs
PublikationsstatusVeröffentlicht - 1999
Extern publiziertJa

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