Premium
Gutmann Donor and Acceptor Numbers for Ionic Liquids
Author(s) -
Schmeisser Matthias,
Illner Peter,
Puchta Ralph,
Zahl Achim,
van Eldik Rudi
Publication year - 2012
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201200584
Subject(s) - ionic liquid , cationic polymerization , chemistry , acceptor , ionic bonding , solvent , ion , nuclear magnetic resonance spectroscopy , spectroscopy , inorganic chemistry , organic chemistry , catalysis , physics , quantum mechanics , condensed matter physics
We present for the first time Gutmann donor and acceptor numbers for a series of 36 different ionic liquids that include 26 distinct anions. The donor numbers were obtained by 23 Na NMR spectroscopy and show a strong dependence on the anionic component of the ionic liquid. The donor numbers measured vary from −12.3 kcal mol −1 for the ionic liquid containing the weakest coordinative anion [emim][FAP] (1‐ethyl‐3‐methylimidazolium tris(pentafluoroethyl)trifluorophosphate), which is a weaker donor than 1,2‐dichloroethane, to 76.7 kcal mol −1 found for the ionic liquid [emim][Br], which exhibits a coordinative strength in the range of tertiary amines. The acceptor numbers were measured by using 31 P NMR spectroscopy and also vary as a function of the anionic and cationic component of the ionic liquid. The data are presented and correlated with other solvent parameters like the Kamlet–Taft set of parameters, and compared to the donor numbers reported by other groups.