Heavy Chalcogenide-Based Ionic Liquids in Syntheses of Metal Chalcogenide Materials near Room Temperature |
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Authors: | Dr Jannick Guschlbauer Prof?Dr Jörg Sundermeyer |
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Institution: | Fachbereich Chemie and Materials Science Center, Philipps-Universität, Hans-Meerwein-Str. 4, 35032 Marburg, Germany |
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Abstract: | This minireview describes two strategically different and unexplored approaches to use ionic liquids (IL) containing weakly solvated and highly reactive chalcogenide anions E-SiMe3]? and E?H]? of the heavy chalcogens (E=S, Se, Te) in materials synthesis near room temperature. The first strategy involves the synthesis of unprecedented trimethylsilyl chalcogenido metalates Cat+M(E-SiMe3)n]? (Cat=organic IL cation) of main group and transition metals (M=Ga, In, Sn, Zn, Cu, Ag, Au). These fully characterized homoleptic metalates serve as thermally metastable precursors in low-temperature syntheses of binary, ternary and even quaternary chalcogenide materials such as CIGS and CZTS relevant for semiconductor and photovoltaics (PV) applications. Furthermore, thermally and protolytically metastable coinage metalates Cat+M(ESiMe3)2]? (M=Cu, Ag, Au; E=S, Se) are accessible. Finally, the use of precursors BMPyrE-SiMe3] (E=Se,Te; BMPyr=1-butyl-1-methylpyrrolidinium) as sources of activated selenium and tellurium in the synthesis of high-grade thermoelectric nanoparticles Bi2Se3 and Bi2Te3 is shortly highlighted. The second synthesis strategy involves the metalation of ionic liquids CatS?H] and CatSe?H] by protolytically highly active metal alkyls or amides RnM. This rather general approach towards unknown chalcogenido metalates CatmRn-1M(E)]m (E=S, Se) will be demonstrated in a research paper following this short review head-to-tail. |
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Keywords: | Ionic liquids chalcogenido metalates chalcogenide materials photovoltaics thermoelectrics |
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