Tunneling in photochemical solid-state H-transfer.: Temperature dependence of the H-abstraction rate in phenazine-doped fluorene single crystals

✍ Scribed by M. Tietje; C. Von Borczyskowski; B. Prass; D. Stehlik

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 777 KB
• Volume: 127
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(86)80593-0

✦ Synopsis

The reaction rate has been measured in the temperature range 50 < 7'~ 300 K for photochemical H-abstraction by phenazine in its excited triplet state doped in fluorene single crystals. Typical features for a tunneling process like the approach to a constant low-temperature rate, a non-Arrhenius temperature-dependent rate and a substantial deuterium effect are demonstrated. Under specific conditions the nuclear motion promoting the reaction can be assigned as a vibrational oscillator with the fundamental energy of 146 cm-'. Problems and possible ways towards final specification of the reaction-promoting nuclear motion are discussed.