Heavy Chalcogenide-Based Ionic Liquids in Syntheses of Metal Chalcogenide Materials near Room Temperature.

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 BMPyr[E-SiMe₃ ] (E=Se,Te; BMPyr=1-butyl-1-methylpyrrolidinium) as sources of activated selenium and tellurium in the synthesis of high-grade thermoelectric nanoparticles Bi₂ Se₃ and Bi₂ Te₃ is shortly highlighted. The second synthesis strategy involves the metalation of ionic liquids Cat[S-H] and Cat[Se-H] by protolytically highly active metal alkyls or amides R_n M. This rather general approach towards unknown chalcogenido metalates Cat_m [R_n-1 M(E)]_m (E=S, Se) will be demonstrated in a research paper following this short review head-to-tail.

SUBMITTER: Guschlbauer J 

PROVIDER: S-EPMC7874248 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature