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The SeCN<jats:sup>\u2212<\/jats:sup> ion dissolved in <jats:italic>N<\/jats:italic>,<jats:italic>N<\/jats:italic>\u2010dimethyl formamide (DMF) has a sufficiently long vibrational lifetime and can form a contact ion pair with Li<jats:sup>+<\/jats:sup> ion in DMF. The CN stretch frequency of the contact ion pair is significantly blue\u2010shifted from that of free SeCN<jats:sup>\u2212<\/jats:sup> so the free SeCN<jats:sup>\u2212<\/jats:sup> 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<jats:sup>+<\/jats:sup> and SeCN<jats:sup>\u2212<\/jats:sup> 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\u00b140 ps.<\/jats:p>","DOI":"10.1002\/cphc.201000595","type":"journal-article","created":{"date-parts":[[2010,11,10]],"date-time":"2010-11-10T10:22:08Z","timestamp":1289384528000},"page":"3632-3637","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":45,"title":["Real\u2010Time Probing of Ion Pairing Dynamics with 2DIR Spectroscopy"],"prefix":"10.1002","volume":"11","author":[{"given":"Kwang\u2010Hee","family":"Park","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Seung 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