Photophysical Properties of (O2(1Δg))2 and O2(1 ) in Solution Phase

Autor:	Tai-Huei Wei, Hui-Ling Lu, Pi-Tai Chou, Youn-Chan Chen, Shu-Juan Chen, Ching-Yen Wei
Rok vydání:	1997
Předmět:	Dissociation rate constant Chemistry Radiative decay Analytical chemistry Quantum yield Physical and Theoretical Chemistry Atomic physics Solution phase Emission intensity Fluorescence Lower limit Dissociation (chemistry)
Zdroj:	The Journal of Physical Chemistry A. 101:8581-8586
ISSN:	1520-5215 1089-5639
Popis:	Using the C60 fluorescence as a reference in combination with the direct spectroscopic observation of 1O2 visible emission, the photophysics of 1O2 dimol ((1Δg)2) and O2(1 ) states in solution has been studied. The quantum yield of O2 1 → 3 (765 nm) emission has been measured to be 1.94 × 10-7, and consequently, the radiative decay rate of 1 → 3 transition was determined to be 1.55 ± 0.04 s-1 which, within the experimental error, is consistent with the previous report of 0.46 s-1.4 Further determination of the ratio between radiative decay and dissociation rates of the 1Δg dimol has been achieved by comparing the dimol (1Δg)2 → (3 )2 emission intensity with the tetra-tert-butylphthalocyanine delayed fluorescence induced by a two-step energy transfer from the O2(1Δg) state. As a result, the lower limit of the dissociation rate constant of the dimol was estimated to be (2.6 ± 0.3) × 1010 s-1 in CCl4.
Databáze:	OpenAIRE
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