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Conductivity and Redox Potentials of Ionic Liquid Trihalogen Monoanions [X3 ]- , [XY2 ]- , and [BrF4 ]- (X=Cl, Br, I and Y=Cl, Br).


ABSTRACT: The ionic liquid (IL) trihalogen monoanions [N2221 ][X3 ]- and [N2221 ][XY2 ]- ([N2221 ]+ =triethylmethylammonium, X=Cl, Br, I, Y=Cl, Br) were investigated electrochemically via temperature dependent conductance and cyclic voltammetry (CV) measurements. The polyhalogen monoanions were measured both as neat salts and as double salts in 1-butyl-1-methyl-pyrrolidinium trifluoromethane-sulfonate ([BMP][OTf], [X3 ]- /[XY2 ]- 0.5?M). Lighter IL trihalogen monoanions displayed higher conductivities than their heavier homologues, with [Cl3 ]- being 1.1 and 3.7 times greater than [Br3 ]- and [I3 ]- , respectively. The addition of [BMP][OTf] reduced the conductivity significantly. Within the group of polyhalogen monoanions, the oxidation potential develops in the series [Cl3 ]- >[BrCl2 ]- >[Br3 ]- >[IBr2 ]- >[ICl2 ]- >[I3 ]- . The redox potential of the interhalogen monoanions was found to be primarily determined by the central halogen, I in [ICl2 ]- and [IBr2 ]- , and Br in [BrCl2 ]- . Additionally, tetrafluorobromate(III) ([N2221 ]+ [BrF4 ]- ) was analyzed via CV in MeCN at 0?°C, yielding a single reversible redox process ([BrF2 ]- /[BrF4 ]- ).

SUBMITTER: Gully TA 

PROVIDER: S-EPMC7874256 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature

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Conductivity and Redox Potentials of Ionic Liquid Trihalogen Monoanions [X<sub>3</sub> ]<sup>-</sup> , [XY<sub>2</sub> ]<sup>-</sup> , and [BrF<sub>4</sub> ]<sup>-</sup> (X=Cl, Br, I and Y=Cl, Br).

Gully Tyler A TA   Voßnacker Patrick P   Schmid Jonas R JR   Beckers Helmut H   Riedel Sebastian S  

ChemistryOpen 20210128 2


The ionic liquid (IL) trihalogen monoanions [N<sub>2221</sub> ][X<sub>3</sub> ]<sup>-</sup> and [N<sub>2221</sub> ][XY<sub>2</sub> ]<sup>-</sup> ([N<sub>2221</sub> ]<sup>+</sup> =triethylmethylammonium, X=Cl, Br, I, Y=Cl, Br) were investigated electrochemically via temperature dependent conductance and cyclic voltammetry (CV) measurements. The polyhalogen monoanions were measured both as neat salts and as double salts in 1-butyl-1-methyl-pyrrolidinium trifluoromethane-sulfonate ([BMP][OTf], [X<s  ...[more]

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