PMID- 24697246
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20150416
LR  - 20140423
IS  - 1520-5126 (Electronic)
IS  - 0002-7863 (Linking)
VI  - 136
IP  - 16
DP  - 2014 Apr 23
TI  - Ultrafast vibrational dynamics and energy transfer in imidazolium ionic liquids.
PG  - 6136-41
LID - 10.1021/ja502527y [doi]
AB  - Femtosecond time-resolved coherent anti-Stokes Raman scattering (CARS) is used as 
      a probe for monitoring the vibrational dynamics of room temperature ionic liquids 
      (ILs). The experiments are performed on a series of 1,3-dialkylimidazolium ILs 
      containing the bis(trifluoromethylsulfonyl)imide [NTf2] anion. The effect of 
      methylation of the cationic C2 position on the dephasing time is studied 
      analyzing [NTf2]-ILs of 1-ethyl-3-methylimidazolium [EMIM], 
      1-ethyl-2,3-dimethylimidazolium [EMMIM], 1-butyl-3-methylimidazolium [BMIM], and 
      1-butyl-2,3-dimethylimidazolium [BMMIM]. Raman coherences are excited around 
       approximately 1400 cm(-1), and the vibrational dephasing of the modes in the fingerprint 
      region is monitored as a function of time. The results indicate that vibrational 
      energy transfer occurs governed by the interionic interactions. This is suggested 
      by mode beating involving vibrations beyond the excitation spectrum as well as 
      systematic differences in the temporal dephasing behavior. In contrast, the 
      length of the cationic alkyl side chain has a negligible impact on the 
      vibrational dynamics.
FAU - Namboodiri, Mahesh
AU  - Namboodiri M
AD  - Center for Functional Materials and Nanomolecular Science, Jacobs University , 
      Campus Ring 1, D-28759 Bremen, Germany.
FAU - Kazemi, Mehdi Mohammad
AU  - Kazemi MM
FAU - Zeb Khan, Tahir
AU  - Zeb Khan T
FAU - Materny, Arnulf
AU  - Materny A
FAU - Kiefer, Johannes
AU  - Kiefer J
LA  - eng
PT  - Journal Article
DEP - 20140415
PL  - United States
TA  - J Am Chem Soc
JT  - Journal of the American Chemical Society
JID - 7503056
EDAT- 2014/04/05 06:00
MHDA- 2014/04/05 06:01
CRDT- 2014/04/05 06:00
PHST- 2014/04/05 06:00 [entrez]
PHST- 2014/04/05 06:00 [pubmed]
PHST- 2014/04/05 06:01 [medline]
AID - 10.1021/ja502527y [doi]
PST - ppublish
SO  - J Am Chem Soc. 2014 Apr 23;136(16):6136-41. doi: 10.1021/ja502527y. Epub 2014 Apr 
      15.