Observing the complete solvation response of DCS in imidazolium ionic liquids, from the femtosecond to nanosecond regimes
2005; Elsevier BV; Volume: 417; Issue: 4-6 Linguagem: Inglês
10.1016/j.cplett.2005.10.062
ISSN1873-4448
AutoresSergei Arzhantsev, Hui Jin, Naoki Ito, Mark Maroncelli,
Tópico(s)Electrochemical Analysis and Applications
ResumoFemtosecond Kerr-gated emission spectroscopy and picosecond time-correlated single photon counting are used to measured the full solvation response of 4-dimethylamino-4′-cyanostilbene in three imidazolium ionic liquids. The liquids studied are comprised of the 3-butyl-1-methylimidazolium cation '(Im41+)' and the anions hexafluorophosphate, bis(trifluoromethylsulfonyl)imide ('Tf2N−'), and tris(trifluoromethylsulfonyl)methide ('Tf3C−'). In all three liquids the solvation response is widely distributed in time with important contributions extending from 100 fs to 10 ns. The amplitude of the fastest (<1 ps) portion of the dynamics is correlated to the relative size and/or mass of the anion and it increases in the order Tf3C-<Tf2N-<PF6-.
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