Photolysis quantum yield measurements in the near-UV; a critical analysis of 1-(2-nitrophenyl)ethyl photochemistry

Photochem Photobiol Sci. 2016 May 11;15(5):604-8. doi: 10.1039/c5pp00440c. Epub 2016 Apr 6.


The photolysis quantum yield, Qp, of 1-(2-nitrophenyl)ethyl phosphate (caged Pi) measured in the near-UV (342 nm peak with 60 nm half-bandwidth) is 0.53 and is based on results reported in 1978 (Biochemistry, 17, 1929-1935). This article amplifies methodology for determining that Qp in view of different recent estimates. Some general principles together with other examples relating to measurement of Qp values are discussed together with their relevance to biological research.

MeSH terms

  • Organophosphates / chemistry*
  • Photolysis*
  • Spectrophotometry, Ultraviolet
  • Ultraviolet Rays


  • Organophosphates