Studies on non-protected fluid room temperature phosphorescence of polycyclic aromatic hydrocarbon of fluoren and acenaphthene

A strong and stable room temperature phosphorescence (RTP) signal of fluore n (Flu), acenaphthene(Ace) aqueous solution can be induced only by using Na 2SO3 as oxygen scavenger and KI as heavy atom perturber. The maximum phosph orescence intensity wavelengths are lambda(ex)/lambda(em) = 285/467, 286/49 3, 520 nm, The RTP intensity is very sensitive to the kind and amount of or ganic solvent added to the system. For a Flu (or Ace)/KI/Na2SO3 aqueous sol ution system containing 1.0% acetonitrile, the RTP intensity is linear to F luter (or Ace) concentration in the range of 8.0 X 10(-7)similar to 8.0 X 1 0(-6) mol/L and 8.0 X 10(-6) similar to 4.0 X 10(-5) mol/L or 8.0 X 10(-7) similar to 2.8 X 10(-6) mol/L and 2. 8 X 10(-6) similar to 4.0 X 10(-5) mol /L, The calculated detection limit by methodology of IUPAC based on three t imes the standard deviation of background is 8.6 X 10(-8), 9.0 X 10(-8) mol /L respectively, The relative standard deviation(n = 7) is 2.4% or 3.5% for the system containing 1.2 X 10(-5) mol/L of Flu or Ace. The present work s hows again that a protective medium is not necessary condition for the flui d RTP emission.