publication . Article . 1980

Heavy Atom Substituents as Molecular Probes for Solvent Effects on the Dynamics of Short‐lived Triplet Exciplexes

Winter, Gerhard; Steiner, Ulrich;
Open Access
  • Published: 01 Jan 1980 Journal: Berichte der Bunsengesellschaft für physikalische Chemie, volume 84, pages 1,203-1,214 (issn: 0005-9021, Copyright policy)
  • Publisher: Wiley
  • Country: Germany
The influence of heavy atom substituents (Br, I) in the electron donor aniline on the electron transfer reaction with thiopyronine triplet is investigated by flash spectroscopy in solvents of different viscosity and polarity. Triplet quenching constants and radical yields are determined. The results are analysed in terms of decay constants of an intermediate triplet exciplex where the heavy atom substituents significantly enhance the intersystem crossing process leading to singlet ground state formation and thus diminishing the radical yield due to exciplex dissociation. The sensitivity of the radical yield to solvent effects is strongly enhanced by heavy atom s...
free text keywords: Lösungsmitteleffekte, Photochemie, Schweratomeffekte, Triplettexciplexe, General Chemical Engineering, ddc:540
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