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Real-Time Probing of Ion Pairing Dynamics with 2DIR Spectroscopy
- Issue Date
- 3-12월-2010
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- chemical exchange; ion pairing dynamics; ion pairs; ir spectroscopy; vibrational probe
- Citation
- CHEMPHYSCHEM, v.11, no.17, pp.3632 - 3637
- Indexed
- SCIE
SCOPUS
- Journal Title
- CHEMPHYSCHEM
- Volume
- 11
- Number
- 17
- Start Page
- 3632
- End Page
- 3637
- ISSN
- 1439-4235
- Abstract
- Chemical exchange two-dimensional infrared (2DIR) spectroscopy is applied to investigate ion pairing dynamics occurring on picosecond timescales. SeCN- ion is used as a vibrational probe. The SeCN- ion dissolved in N,N-dimethyl formamide (DMF) has a sufficiently long vibrational lifetime and can form a contact ion pair with Li+ ion in DMF. The CN stretch frequency of the contact ion pair is significantly blue-shifted from that of free SeCN- so the free SeCN- ion can be spectrally distinct from the contact ion pair in DMF. Therefore, we were able to directly monitor the ion pairing dynamics of Li+ and SeCN- in real time by using ultrafast 2DIR spectroscopy. As a result, we have determined the dissociation time constant of the LiSeCN contact ion pair to be 420 +/- 40 ps.
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