James F. Wishart, Sharon I. Lall-Ramnarine, Ravinder Raju, Alexander Scumpia, Sherly Bellevue, Revans Ragbir, and Robert Engel
Radiat. Phys. Chem., 72, 99-104 (2005). [Find paper at Elsevier Science Direct]
Abstract:
Ionic liquids containing ether-, alcohol- and alkyl-functionalized quaternary ammonium dications were studied by pulse radiolysis. Spectra on nanosecond timescales revealed that solvation of the excess electron is particularly slow in the case of the alcohol-derivatized ionic liquids. The blue shift of the electron spectrum to the customary 650 nm peak takes 25-40 nanoseconds at 21 C. Comparison with the relaxation dynamics observed in viscous 1,2,6-trihydroxyhexane reveals the hindering effect of the ionic liquid lattice on hydroxypropyl side chain reorientation.