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The polyhalogen monoanions were measured both as neat salts and as double salts in 1\u2010butyl\u20101\u2010methyl\u2010pyrrolidinium trifluoromethane\u2010sulfonate ([BMP][OTf], [X<jats:sub>3<\/jats:sub>]<jats:sup>\u2212<\/jats:sup>\/[XY<jats:sub>2<\/jats:sub>]<jats:sup>\u2212<\/jats:sup> 0.5\u2005M). Lighter IL trihalogen monoanions displayed higher conductivities than their heavier homologues, with [Cl<jats:sub>3<\/jats:sub>]<jats:sup>\u2212<\/jats:sup> being 1.1 and 3.7 times greater than [Br<jats:sub>3<\/jats:sub>]<jats:sup>\u2212<\/jats:sup> and [I<jats:sub>3<\/jats:sub>]<jats:sup>\u2212<\/jats:sup>, respectively. The addition of [BMP][OTf] reduced the conductivity significantly. Within the group of polyhalogen monoanions, the oxidation potential develops in the series [Cl<jats:sub>3<\/jats:sub>]<jats:sup>\u2212<\/jats:sup>&gt;[BrCl<jats:sub>2<\/jats:sub>]<jats:sup>\u2212<\/jats:sup>&gt;[Br<jats:sub>3<\/jats:sub>]<jats:sup>\u2212<\/jats:sup>&gt;[IBr<jats:sub>2<\/jats:sub>]<jats:sup>\u2212<\/jats:sup>&gt;[ICl<jats:sub>2<\/jats:sub>]<jats:sup>\u2212<\/jats:sup>&gt;[I<jats:sub>3<\/jats:sub>]<jats:sup>\u2212<\/jats:sup>. The redox potential of the interhalogen monoanions was found to be primarily determined by the central halogen, I in [ICl<jats:sub>2<\/jats:sub>]<jats:sup>\u2212<\/jats:sup> and [IBr<jats:sub>2<\/jats:sub>]<jats:sup>\u2212<\/jats:sup><jats:sub>,<\/jats:sub> and Br in [BrCl<jats:sub>2<\/jats:sub>]<jats:sup>\u2212<\/jats:sup>. Additionally, tetrafluorobromate(III) ([N<jats:sub>2221<\/jats:sub>]<jats:sup>+<\/jats:sup>[BrF<jats:sub>4<\/jats:sub>]<jats:sup>\u2212<\/jats:sup>) was analyzed via CV in MeCN at 0\u2009\u00b0C, yielding a single reversible redox process ([BrF<jats:sub>2<\/jats:sub>]<jats:sup>\u2212<\/jats:sup>\/[BrF<jats:sub>4<\/jats:sub>]<jats:sup>\u2212<\/jats:sup>).<\/jats:p>","DOI":"10.1002\/open.202000263","type":"journal-article","created":{"date-parts":[[2021,1,28]],"date-time":"2021-01-28T17:45:24Z","timestamp":1611855924000},"page":"255-264","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Conductivity and Redox Potentials of Ionic Liquid Trihalogen Monoanions [X<sub>3<\/sub>]<sup>\u2212<\/sup>, [XY<sub>2<\/sub>]<sup>\u2212<\/sup>, and [BrF<sub>4<\/sub>]<sup>\u2212<\/sup> (X=Cl, Br, I and Y=Cl, Br)"],"prefix":"10.1002","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8302-9786","authenticated-orcid":false,"given":"Tyler A.","family":"Gully","sequence":"first","affiliation":[{"name":"Freie Universit\u00e4t Berlin Fachbereich Biologie, Chemie, Pharmazie Institut f\u00fcr Chemie und Biochemie \u2013 Anorganische Chemie  Fabeckstr. 34\/36 14195 Berlin Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Patrick","family":"Vo\u00dfnacker","sequence":"additional","affiliation":[{"name":"Freie Universit\u00e4t Berlin Fachbereich Biologie, Chemie, Pharmazie Institut f\u00fcr Chemie und Biochemie \u2013 Anorganische Chemie  Fabeckstr. 34\/36 14195 Berlin Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9521-9317","authenticated-orcid":false,"given":"Jonas R.","family":"Schmid","sequence":"additional","affiliation":[{"name":"Freie Universit\u00e4t Berlin Fachbereich Biologie, Chemie, Pharmazie Institut f\u00fcr Chemie und Biochemie \u2013 Anorganische Chemie  Fabeckstr. 34\/36 14195 Berlin Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7903-4291","authenticated-orcid":false,"given":"Helmut","family":"Beckers","sequence":"additional","affiliation":[{"name":"Freie Universit\u00e4t Berlin Fachbereich Biologie, Chemie, Pharmazie Institut f\u00fcr Chemie und Biochemie \u2013 Anorganische Chemie  Fabeckstr. 34\/36 14195 Berlin Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4552-5719","authenticated-orcid":false,"given":"Sebastian","family":"Riedel","sequence":"additional","affiliation":[{"name":"Freie Universit\u00e4t Berlin Fachbereich Biologie, Chemie, Pharmazie Institut f\u00fcr Chemie und Biochemie \u2013 Anorganische Chemie  Fabeckstr. 34\/36 14195 Berlin Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2021,1,28]]},"reference":[{"key":"e_1_2_7_1_1","doi-asserted-by":"publisher","DOI":"10.1039\/CT9232300654"},{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1021\/ic034091n"},{"key":"e_1_2_7_3_1","unstructured":"\u00a0"},{"key":"e_1_2_7_4_2","author":"Sun Z.","year":"2018","journal-title":"J. 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