Diimidazolium Halobismuthates [Dim]2[Bi2X10] (X = Cl–, Br–, or I–): A New Class of Thermochromic and Photoluminescent Materials
| Autor: | Alberto García-Fernández, Socorro Castro-García, Alberto Fernández, Ismael Marcos-Cives, Carlos Platas-Iglesias, Digna Vázquez-García, Manuel Sánchez-Andújar |
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| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
Thermochromism Photoluminescence 010405 organic chemistry Band gap business.industry Iodide Halide Crystal structure 010402 general chemistry 01 natural sciences 0104 chemical sciences Inorganic Chemistry Crystallography Semiconductor chemistry Octahedron Physical and Theoretical Chemistry business |
| Zdroj: | Inorganic Chemistry. 57:7655-7664 |
| ISSN: | 1520-510X 0020-1669 |
| DOI: | 10.1021/acs.inorgchem.8b00629 |
| Popis: | We present a novel family of polyhalide salts of Bi(III) with the general formula [Dim]2[Bi2X10], where Dim2+ is the diimidazolium cation (C9H14N4)2+ and X is Cl–, Br–, or I–. Single-phase materials are easily obtained by means of a mild solution chemistry method performed at room temperature. This [Dim]2[Bi2X10] family exhibits a crystal structure based on halobismuthate [Bi2X10]4– dimers, built by distorted {BiX6} octahedra interconnected by edge sharing, and sandwiched between two diimidazolium cations. The optical band gaps displayed by these materials (1.9–3.2 eV) allow their classification as semiconductors. Additionally, the three halides display photoluminescence with emission in the visible range. The behavior of [Dim]2[Bi2I10] is particularly interesting, as it shows an optical band gap of 1.9 eV, a broad band photoluminescence emission, and a relatively long emission lifetime of 190 ns. Moreover, the iodide and bromide compounds also exhibit a reversible solid state thermochromism, being the fi... |
| Databáze: | OpenAIRE |
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