Caesium enneabromodibismuthate is an inorganic compound with the formula Cs3Bi2Br9. It is one of the coordination complexes formed by
caesium,
bismuth and
bromine.[1] At room temperature, it is trigonal (P3m1) and it undergoes phase transformation to monoclinic phase (C12/c1) when the temperature is below 96 K.[2]
Preparation
Traditionally, it can be synthesized from a hydrobromic acid solution of stoichiometric amounts of
caesium bromide and
bismuth hydroxide or
bismuth(III) oxide,[3] crystals are formed by cooling the hot, saturated solution.[4] It can also be obtained by reacting caesium bromide and
bismuth(III) bromide in DMF, followed by vaporizing the solvent.[5] Its nanocrystals can be synthesized in
1-octadecene at 170 °C using
caesium oleate and bismuth(III) bromide as precursors.[6]
References
^Tran, Minh N.; Cleveland, Iver J.; Aydil, Eray S. (January 2021). "Physical vapor deposition of the halide perovskite CsBi2Br7". Journal of Vacuum Science & Technology A. 39 (1): 013409.
doi:
10.1116/6.0000604.
eISSN1520-8559.
ISSN0734-2101.
S2CID234115452.
^Tran, Minh N.; Cleveland, Iver J.; Aydil, Eray S. (2020). "Resolving the discrepancies in the reported optical absorption of low-dimensional non-toxic perovskites, Cs3Bi2Br9 and Cs3BiBr6". Journal of Materials Chemistry C. 8 (30): 10456–10463.
doi:
10.1039/d0tc02783a.
eISSN2050-7534.
ISSN2050-7526.
S2CID225578432.
^Timmermans, C. W. M.; Blasse, G. (1 August 1981). "On the Luminescence of Cs3Bi2Br9 Single Crystals". Physica Status Solidi B (in German). 106 (2): 647–655.
doi:
10.1002/pssb.2221060230.
eISSN1521-3951.
ISSN0370-1972.