Issue 22, 2021

Halogenated sodium/lithium monocarba-closo-decaborates: syntheses, characterization, and solid-state ionic conductivity

Abstract

A series of halogenated monocarba-closo-decaborates, M[closo-1-CHB9H8-6-X] (M = Na, Li; X = Br, I) and M[closo-1-CHB9H4-6,7,8,9,10-I5] (M = Na, Li) have been synthesized for systematically investigating the influence of halogenation of the monocarba-closo-decaborates on the thermal stability, phase transition and ionic conductivity. The thermal stability of halogenated derivatives is lower than that of the corresponding parent compounds of M[closo-1-CHB9H9] (M = Na, Li) with a trend of M[closo-1-CHB9H8-6-Br] < M[closo-1-CHB9H8-6-I] < M[closo-1-CHB9H4-6,7,8,9,10-I5] (M = Na, Li). Both Na[closo-1-CHB9H8-6-Br] and Na[closo-1-CHB9H8-6-I] undergo a phase transition before decomposition, which occurred at a higher temperature than that of the parent compound Na[closo-1-CHB9H9]. In comparison to the parent compound, all halogenated derivatives show lower ionic conductivities with the trend of M[closo-1-CHB9H8-6-Br] > M[closo-1-CHB9H8-6-I] > M[closo-1-CHB9H4-6,7,8,9,10-I5] (M = Na, Li). The results are supported by the theoretical calculation results based on ESP, suggesting that the ionic conductivities of halogenated derivatives are mainly influenced by anisotropic electron densities.

Graphical abstract: Halogenated sodium/lithium monocarba-closo-decaborates: syntheses, characterization, and solid-state ionic conductivity

Supplementary files

Article information

Article type
Research Article
Submitted
28 Jul 2021
Accepted
28 Sep 2021
First published
28 Sep 2021

Mater. Chem. Front., 2021,5, 8037-8046

Halogenated sodium/lithium monocarba-closo-decaborates: syntheses, characterization, and solid-state ionic conductivity

S. Li, P. Qiu, J. Kang, Z. Shi, Y. Zhang, Y. Ma and X. Chen, Mater. Chem. Front., 2021, 5, 8037 DOI: 10.1039/D1QM01066B

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