Photochemistry of iodoform in methanol: Formation and fate of the iso-CHI2-I photoproduct

Patrick Z. El-Khoury, Wai Ming Kwok, Xiangguo Guan, Chensheng Ma, David Lee Phillips, Alexander N. Tarnovsky

Research output: Journal article publicationJournal articleAcademic researchpeer-review

29 Citations (Scopus)

Abstract

Ultrafast population and structural dynamics due to the iso-CHI 2-I isomer product formed upon UV excitation of iodoform (CHI 3) in solution is monitored by femtosecond transient absorption with deep-UV through near-IR probing and picosecond transient resonance Raman spectroscopy. Iso-CHI2-I is found to be a major photochemical product regardless of excitation wavelength (266 and 350 nm) and choice of solvent (methanol, acetonitrile, and cyclohexane), and is produced in 50% quantum yield upon 266 nm excitation of CHI3 in CH3OH. The isomer remains stable up to at least several nanoseconds in C6H12 and CH3CN, but undergoes decay with a 740 ps lifetime in CH 3OH simultaneously with the formation of an iodide ion. In agreement with the experiments, MP2 calculations suggest that iso-CHI2-I readily reacts with CH3OH via O-H insertion/HI elimination reactions. KGaA, Weinheim.
Original languageEnglish
Pages (from-to)1895-1900
Number of pages6
JournalChemPhysChem
Volume10
Issue number11
DOIs
Publication statusPublished - 3 Aug 2009

Keywords

  • Density functional calculations
  • Iodoform
  • Isomerization
  • Photochemistry
  • Solvent effects

ASJC Scopus subject areas

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

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