Fluorescence lifetimes and relative quantum yields of 9,10-diphenylanthracene in dilute solutions of cyclohexane and benzene

✍ Scribed by D.J.S. Birch; R.E. Imhof

• Publisher: Elsevier Science
• Year: 1975
• Tongue: English
• Weight: 351 KB
• Volume: 32
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(75)85167-0

✦ Synopsis

The lifetimes of 9,10_diphenylantllracenein dilute solutions ol cyclotexane and benzene at 25°C have been found to k 7.58 2 0.04 and 6.95 * 0.04 ns respccrively. hleasuwmcnts of the relative quanrun yields>how that the dependenca ': _: on the solvent is caused by an incseased piobnbility for rmnkadiative drczy in benzene compucd with 'cyclohexane. This

Wviaur is shown to pirtly rcconcilc previou; confiictiq data on the rarliative.proper~ies of Lhis molccLtic.

.'

We have measured the lifetimes of 9, IO-diphenylarithracenk (CPA) in dilute.soliltions of cyclohexane criminator, which supplies."stop" pulses to the Ortec mod:1 437A time to amplitude converter (TAC). and benzene, in an effoit to resoive the continuing T controrer;j; [l'l2] regarding the radia'.ive properties "Start" pulses are derived via an Ortec model $63 of this mkdcule; The measuremenk were made with constant fraction discriminator and an EMI'madel :j the single photoc delaj%d coincidence technique, '. ', " rhdiatlve pait deing constant. .' ; : Thk d@agree&nt in the quantum.yield of.DPA be---'twezn'Melhu,ish [9] &d Birks and Dyspn [4].on the: .' [l] I.B. Berimnn, Chem..Phys\Lctlers 21 (1973) 344..