Premium
The Water‐Rich Iodidobismuthate (H 3 O)Rb 3 BiI 7 ·4H 2 O
Author(s) -
Chang JenHui,
Albrecht Ralf,
Doert Thomas,
Ruck Michael
Publication year - 2020
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201900209
Subject(s) - crystallography , orthorhombic crystal system , chemistry , octahedron , sodalite , aqueous solution , triiodide , crystal structure , hydrate , halide , protonation , water of crystallization , ion , inorganic chemistry , zeolite , biochemistry , organic chemistry , electrode , dye sensitized solar cell , electrolyte , catalysis
Red cuboid crystals of the water‐rich iodidobismuthate(III) (H 3 O)Rb 3 BiI 7 · 4H 2 O crystallize from a solution of RbI and BiIO in concentrated aqueous HI at ambient conditions. X‐ray diffraction reveale an orthorhombic structure with space group Pnma (no. 62). In the crystal structure, [BiI 6 ] 3– octahedra are arranged in layers parallel to (010). Nine‐fold coordinated Rb + and additional I – ions connect the iodidobismuthate(III) groups into a three‐dimensional framework, which hosts protonated water complexes 1 ∞ [H 11 O 5 ] + , i.e. infinite zigzag chains of hydrogen‐bonded water molecules and oxonium cations. (H 3 O)Rb 3 BiI 7 · 4H 2 O decomposes in air at ambient temperature within few days, resulting in fragmentation and amorphization of the crystals. Fast and complete dehydration occurs between 50 °C and 100 °C. Hydrates like this are possible intermediates in the slow hydrolysis of bismuth‐based halide perovskites, which are currently discussed as lead‐free alternatives to the solar cell absorber material methylammonium lead triiodide (MAPI).