Blending ionic liquids: how physico-chemical properties change.
Ionic liquids offer the opportunity of tailoring their properties by changing the chemical structure of the cation and anion. Blending of two or more liquids adds a further dimension to this "chemical space". Here we present the results of a study of three binary and one ternary mixture of the ionic liquids formed by the N-butyl-N-methylpyrrolidinium cation with bis(trifluoromethanesulfonyl) imide, bis(pentafluoroethanesulfonyl) imide and (trifluoromethanesulfonyl)(nonafluorobutanesulfonyl) imide. We have collected viscosity and NMR-based data on ionxion correlations (NOE) and diffusion (DOSY). We also attempt to establish a quantitative correlation between mixture and the corresponding pure liquid properties. We find that the binary mixture containing the two very different anions has an intriguing and somewhat anomalous behaviour.
Dipartimento di Chimica, Materiali e Ingegneria Chimica G. Natta, Politecnico di Milano, Via L. Mancinelli, 7, 20131 Milano, Italy.
Franca
F
Castiglione
Guido
G
Raos
Giovanni Battista
GB
Appetecchi
Maria
M
Montanino
Stefano
S
Passerini
Margherita
M
Moreno
Antonino
A
Famulari
Andrea
A
Mele