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Effect of Dimethyl Carbonate on the Dynamic Properties and Ionicities of Ionic Liquids with [M III (hfip) 4 ] − (M=B, Al) Anions
Author(s) -
Rupp Alexander B. A.,
Welle Sabrina,
Klose Petra,
Scherer Harald,
Krossing Ingo
Publication year - 2015
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201500069
Subject(s) - ionic liquid , dimethyl carbonate , diffusion , chemistry , electrolyte , propylene carbonate , ion , analytical chemistry (journal) , inorganic chemistry , thermodynamics , organic chemistry , methanol , physics , electrode , catalysis
Several ionic liquids (ILs) comprising [B(hfip) 4 ] − [hfip=OCH(CF 3 ) 2 ] or [Al(hfip) 4 ] − anions and imidazolium or ammonium cations were prepared and mixed with up to 270 mol % of dimethyl carbonate (DMC). The viscosities, conductivities, and self‐diffusion constants of these mixtures and, where possible, of the neat ILs were measured and compared with common [NTf 2 ] − based ILs and their mixtures with DMC. A tremendous decrease of the viscosities and a likewise increase of the conductivities and diffusion constants can be achieved for all classes of ILs. However, the order of the conductivities is partially reversed in the diffusion data. This is probably due to the low dielectric constant of DMC and the, thus, favored ion pairing, as evidenced, for example, by the calculated ionicities. Altogether, our data show that the chemically robust, but high‐melting and more viscous [B(hfip) 4 ] − ILs might be candidates for electrolytes when mixed with suitable molecular solvents.