Accession Number : ADA140919

Title :   Exciplex Ionic Dissociation in Non-Polar Solvent Induced by Multipolar Salt Complexes.

Descriptive Note : Technical rept.,

Corporate Author : ILLINOIS UNIV AT URBANA DEPT OF CHEMISTRY

Personal Author(s) : Goodson,B E ; Schuster,G B

PDF Url : ADA140919

Report Date : 26 Apr 1984

Pagination or Media Count : 15

Abstract : The exciplex formed from pyrene and 1,4-dicyanobenzene in dimethoxy-ethane solution is quenched by tetra-n-butylammonium tetrafluoroborate. Stern-Volmer analysis reveals that the salt is a more effective quencher at low concentrations than at high concentrations. Related non-linear effects are observed when the yield of radical ions formed by reaction of the salt with the exciplex is determ ined by laser transient absorption spectroscopy. Very little pyrene radical cation is formed at low salt concentration even though significant exciplex quenching occurs. These effects are a consequence of association of the salt to form a quadrupolar dimer from a dipolar monomer. The quadrupole quenches the exciplex and leads to the generation of radical ions, and the dipole quenches but does not give ions. We have demonstrated that the radical ions resulting from quadrupolar quenching are capable of undergoing characteristic chemical reactions. (Author)

Descriptors :   *Ions, *Dissociation, *Hydrocarbons, *Benzene, Cyclic compounds, Methanes, Solutions(Mixtures), Quenching, Borates, Fluorine compounds, Ammonium compounds, Butyl radicals, Salts, Electron transfer, Solvents, Quadrupole moment, Laser applications, Spectroscopy, Dimers, Dipoles

Subject Categories : Polymer Chemistry
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE