Semiconducting [(Bi<sub>4</sub>Te<sub>4</sub>Br<sub>2</sub>)(Al<sub>2</sub>Cl<sub>6–<i>x</i></sub>Br<sub><i>x</i></sub>)]Cl<sub>2</sub> and [Bi<sub>2</sub>Se<sub>2</sub>Br](AlCl<sub>4</sub>): Cationic Chalcogenide Frameworks from Lewis Acidic Ionic Liquids
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Lewis acidic organic ionic liquids provide a novel synthetic medium to prepare new semiconducting chalcogenides, [(Bi4Te4Br2)(Al2Cl5.46Br0.54)]Cl2 (1) and [Bi2Se2Br](AlCl4) (2). Compound 1 features a cationic [(Bi4Te4Br2)(Al2Cl5.46Br0.54)]2+ three-dimensional framework, while compound 2 consists of cationic layers of [Bi2Se2Br]2+. Spectroscopically measured band gaps of 1 and 2 are ∼0.6 and ∼1.2 eV, respectively. Thermoelectric power measurements of single crystals of 1 indicate an n-type semiconductor.
创建时间：
2013-05-20
