Emission from aromatic hydrocarbon-diene and -olefin exciplexes

✍ Scribed by G.N Taylor

• Publisher: Elsevier Science
• Year: 1971
• Tongue: English
• Weight: 588 KB
• Volume: 10
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(71)80308-1

✦ Synopsis

Luminesc&ce from aromatic &ydrocarbok-olefm and--diene excipkkes, providing strong evidence for t&r intermediary k.singkt_&.&~hin~ prbcesses, ii reported. Solvent dependence of the emission n&mum gives a vahktif i0.8D for thk~didipole.~ti&eot if the I-cyanonsphihalene-I.ZaimethylcycIapentene excipiex whiIe the. ieniperature'dependence affords-a: value of'6.7 k&d/M for the heat of formation. Linear-free-energy correlations of rate.cCktantj for lkydnotiaphthdene.ed naphthklene fluorescence quenchtig by &&s and okfins 'kd strained hydrocarbons with the adiabatic ionization p&entiaIs of-the-quenchers are consistent with major cokributions from charg&e~.onank~ in the exdplek fo,Tati& process.

The initial ob!ekations that naphthalene flu&&'.

.-is.

:: ., '(SQ)*+ SQ ;-(5) cence was qu&ch@with varying degrees of effici&cy -. by conjugated dienes [ 1; 2] .and q&lricyc!ene [3,4] S 5 aromatic hydrocarbdti, Q E Quencher, R = were interpreted according to an exciplek formation rearranged quencher, SQ = ph&cycIization product; mechanism (Scheme 1). .~ S*Q.+SQ* , lSoZ ls* excitation,