Real-time probing of ion pairing dynamics with 2DIR spectroscopy

Kwang Hee Park, Seung Ryul Choi, Jun Ho Choi, Sungnam Park, Minhaeng Cho

Research output: Contribution to journalArticle

28 Citations (Scopus)

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.Ion pairing dynamics are probed by using a chemical exchange 2DIR spectroscopic technique in real time (see picture). The dissociation time constant of the LiSeCN contact ion pair in N,N-dimethyl formamide solution is determined to be 420±40 ps.

Original languageEnglish
Pages (from-to)3632-3637
Number of pages6
JournalChemPhysChem
Volume11
Issue number17
DOIs
Publication statusPublished - 2010 Dec 1

Fingerprint

Spectrum Analysis
Spectroscopy
Ions
spectroscopy
ions
Dimethylformamide
time constant
dissociation
Contacts (fluid mechanics)
Infrared spectroscopy
infrared spectroscopy
life (durability)
probes

Keywords

  • Chemical exchange
  • Ion pairing dynamics
  • Ion pairs
  • Ir spectroscopy
  • Vibrational probe

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Atomic and Molecular Physics, and Optics

Cite this

Real-time probing of ion pairing dynamics with 2DIR spectroscopy. / Park, Kwang Hee; Choi, Seung Ryul; Choi, Jun Ho; Park, Sungnam; Cho, Minhaeng.

In: ChemPhysChem, Vol. 11, No. 17, 01.12.2010, p. 3632-3637.

Research output: Contribution to journalArticle

Park, Kwang Hee ; Choi, Seung Ryul ; Choi, Jun Ho ; Park, Sungnam ; Cho, Minhaeng. / Real-time probing of ion pairing dynamics with 2DIR spectroscopy. In: ChemPhysChem. 2010 ; Vol. 11, No. 17. pp. 3632-3637.
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