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Title: Cyanohydridoborate Anions: Synthesis, Salts, and Low‐Viscosity Ionic Liquids

Journal Article · · Chemistry - A European Journal
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [3];  [4];  [3];  [5]; ORCiD logo [1]
  1. Institut für nachhaltige Chemie &, Katalyse mit Bor (ICB), Institut für Anorganische Chemie Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
  2. Institut für Organische Chemie &, Center for Nanosystems Chemistry Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
  3. Physical Sciences Division Pacific Northwest National Laboratory 902 Battelle Boulevard, P.O. Box 999, MSIN K8-88 Richland WA 99352 USA
  4. Department of Chemistry Purdue University 560 Oval Drive West Lafayette IN 47907 USA
  5. Institut für nachhaltige Chemie &, Katalyse mit Bor (ICB), Institut für Anorganische Chemie Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany, Consultant Merck KGaA 64293 Darmstadt Germany

Abstract High‐yield syntheses up to molar scales for salts of [BH(CN) 3 ] ( 2 ) and [BH 2 (CN) 2 ] ( 3 ) starting from commercially available Na[BH 4 ] (Na 5 ), Na[BH 3 (CN)] (Na 4 ), BCl 3 , (CH 3 ) 3 SiCN, and KCN were developed. Direct conversion of Na 5 into K 2 was accomplished with (CH 3 ) 3 SiCN and (CH 3 ) 3 SiCl as a catalyst in an autoclave. Alternatively, Na 5 is converted into Na[BH{OC(O) R } 3 ] ( R =alkyl) that is more reactive towards (CH 3 ) 3 SiCN and thus provides an easy access to salts of 2 . Some reaction intermediates were identified, for example, Na[BH(CN){OC(O)Et} 2 ] (Na 7 b ) and Na[BH(CN) 2 {OC(O)Et}] (Na 8 b ). A third entry to 2 and 3 uses ether adducts of BHCl 2 or BH 2 Cl such as the commercial 1,4‐dioxane adducts that react with KCN and (CH 3 ) 3 SiCN. Alkali metal salts of 2 and 3 are convenient starting materials for organic salts, especially for low viscosity ionic liquids (ILs). [EMIm] 3 has the lowest viscosity and highest conductivity with 10.2 mPa s and 32.6 mS cm −1 at 20 °C known for non‐protic ILs. The ILs are thermally, chemically, and electrochemically robust. These properties are crucial for applications in electrochemical devices, for example, dye‐sensitized solar cells (Grätzel cells).

Sponsoring Organization:
USDOE
OSTI ID:
1494206
Journal Information:
Chemistry - A European Journal, Journal Name: Chemistry - A European Journal Journal Issue: 14 Vol. 25; ISSN 0947-6539
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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