Comparison of the dehalogenation of polyhalomethanes and production of strong acids in aqueous and salt (NaCl) water environments: Ultraviolet photolysis of CH2I2

Xiangguo Guan, Yong Du, Yun Liang Li, Wai Ming Kwok, David Lee Phillips

Research output: Journal article publicationJournal articleAcademic researchpeer-review

11 Citations (Scopus)


The ultraviolet photolysis of CH2I2was studied in water and salt water solutions using photochemistry and picosecond time-resolved resonance Raman spectroscopy. Photolysis in both types of environments produces mainly CH2(OH)2and HI products. However, photolysis of CH2I2in salt water leads to the formation of different products/intermediates (CH2ICl and Cl2-) not observed in the absence of salt in aqueous solutions. The amount of CH2(OH)2and HI products appears to decrease after photolysis of CH2I2in salt water compared to pure water. We briefly discuss possible implications of these results for photolysis of CH2I2and other polyhalomethanes in sea water and other salt aqueous environments compared to nonsalt water solvated environments.
Original languageEnglish
Pages (from-to)8399-8409
Number of pages11
JournalJournal of Chemical Physics
Issue number17
Publication statusPublished - 1 Nov 2004
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this