Scalable and Safe closo-[CB11H12] Salt Synthesis

  • Author: Maddi Langweil
  • Published: 22 September 2021
  • Copyright: Wiley-VCH GmbH
  • Associated Societies: American Chemical Society (ACS), USA
thumbnail image: Scalable and Safe <i>closo</i>-[CB<sub>11</sub>H<sub>12</sub>]<sup>–</sup> Salt Synthesis

Lithium and sodium salts of the closo-[CB11H12] anion can be useful as electrolytes for all-solid-state batteries as they provide high ionic conductivity. The closo-carbadodecaborate anions in these salts are weakly coordinating, which is ideal for the movement of cations such as Na+ and Li+. They also have a delocalized electronic structure, making them chemically stable. Existing syntheses of the closo-[CB11H12] anion can be complex, expensive, and require dangerous reagents that hamper the commercial use of closo-carbadodecaborate anions in electrolytes.

Mark Paskevicius, Curtin University, Perth, Australia, and colleagues have used cost-effective common laboratory reagents to synthesize the closo-[CB11H12] anion while avoiding reagents like decaborane, NaH, and CF3SiMe3, which can be toxic, flammable, and/or expensive. Instead of using decaborane as a precursor to synthesize the closo-[CB11H12] anion, the team used nido-[B11H14] as a precursor. The team deprotonated the anion of Me3NH[B11H14] using NaOH and K2CO3 and reacted it with chloroform to give closo-[CB11H12].

Using this method on a gram scale, the team obtained a yield of 40 %, compared with 95 % for previously known approaches. However, the method avoids the use of dangerous substances and the cost of the reagents is significantly lower. The developed method to synthesize Me3NH[CB11H12] could be accessible to any chemist and further the commercial application of closo-[CB11H12] salts for all-solid-state batteries.



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