Hydrogen bond migration between molecular sites observed with ultrafast 2D IR chemical exchange spectroscopy

Daniel E. Rosenfeld, Kyungwon Kwak, Zsolt Gengeliczki, M. D. Fayer

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Hydrogen-bonded complexes between phenol and phenylacetylene are studied using ultrafast two-dimensional infrared (2D IR) chemical exchange spectroscopy. Phenylacetylene has two possible π hydrogen bonding acceptor sites (phenyl or acetylene) that compete for hydrogen bond donors in solution at room temperature. The OD stretch frequency of deuterated phenol is sensitive to which acceptor site it is bound. The appearance of off-diagonal peaks between the two vibrational frequencies in the 2D IR spectrum reports on the exchange process between the two competitive hydrogen-bonding sites of phenol-phenylacetylene complexes in the neat phenylacetylene solvent. The chemical exchange process occurs in ∼5 ps and is assigned to direct hydrogen bond migration along the phenylacetylene molecule. Other nonmigration mechanisms are ruled out by performing 2D IR experiments on phenol dissolved in the phenylacetylene/carbon tetrachloride mixed solvent. The observation of direct hydrogen bond migration can have implications for macromolecular systems.

Original languageEnglish
Pages (from-to)2383-2389
Number of pages7
JournalJournal of Physical Chemistry B
Volume114
Issue number7
DOIs
Publication statusPublished - 2010 Feb 25

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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