Infrared pump-probe study of nanoconfined water structure in reverse micelle

Jooyong Lee, Michał Maj, Kyungwon Kwak, Minhaeng Cho

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


The influence of nanoconfinement on water structure is studied with time- and frequency-resolved vibrational spectroscopy of hydrazoic acid (HN3) encapsulated in reverse micelle. The azido stretch mode of HN3 is found to be a promising infrared probe for studying the structure and local hydrogen-bond environment of confined and interfacial water in reverse micelle due to its narrow spectral bandwidth and large transition dipole moment. The results show a clear separation between the core and shell spectral components, making it advantageous over the previously studied infrared probes. The measured vibrational lifetimes appear to be substantially different for the interfacial and bulk-like environments but show no remarkable size dependency, which indicates that water structures around this IR probe are distinctively different in the core and shell regions. The influence of local hydrogen bond network in the first and higher solvation shells on the vibrational dynamics of HN3 is further discussed.

Original languageEnglish
Pages (from-to)3404-3407
Number of pages4
JournalJournal of Physical Chemistry Letters
Issue number19
Publication statusPublished - 2014 Oct 2

Bibliographical note

Publisher Copyright:
© 2014 American Chemical Society.


  • IR pump-probe spectroscopy
  • hydrogen bond
  • nanoconfined water
  • reverse micelle
  • vibrational spectroscopy

ASJC Scopus subject areas

  • General Materials Science
  • Physical and Theoretical Chemistry


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