Reversible triplet energy transfer between neo-alloocimene and anthracene

✍ Scribed by A.A. Gorman; I. Hamblett; N.-H. Jensen

• Book ID: 103026600
• Publisher: Elsevier Science
• Year: 1984
• Tongue: English
• Weight: 319 KB
• Volume: 111
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(84)85509-8

✦ Synopsis

The rate constants for triplet energy transfer between neo-alloocimene and anthracene have been redetermined by a combination of pulsed laser photolysis and computer simulation of previously reported puIse radiolysis data. The true rate constants are 4-6 times larger than previously reported. Variable temperature experiments confirm that neoaIloocimene is a vertical accept& of triplet energy from anthracene although, presumably as a consequence of fast subsequent relaxation within the encounter complex, the rate constant is faster than predicted by the Sandros equation. If the rate constants for fonvard and back transfer of triplet energy eshibit approdmately the same pre-exponential factors, the relaxed triplet energy of neo+xIIoocimene is placed at ==I68 kJ mol-' above the ground-state surface = =29 kJ mol-' less than the correspond-