Time-resolved study of singlet molecular oxygen (/sup 1/. delta. /sub g/O/sub 2/) formation in a solution-phase photosensitized reaction: a new experimental technique to examine the dynamics of quenching by oxygen
The solution-phase, time-resolved phosphorescence of singlet molecular oxygen (/sup 1/..delta../sub g/O/sub 2/), created by energy transfer from a sensitizer, has been examined by using a near-infrared detection system capable of resolving events that result in the formation of /sup 1/..delta../sub g/O/sub 2/. As a method by which to examine oxygen quenching reactions, this approach is seen to complement flash absorption studies. Unlike existing experimental techniques, however, their approach is uniquely sensitive to rate-limiting steps that might exist during the energy-transfer process to form /sup 1/..delta../sub g/O/sub 2/. In this report, they present oxygen quenching rate constants for the triplet state of five different molecules in several solvents. In addition, they suggest that a static quenching component may be involved in the oxygen-induced deactivation of a triplet state.
- Research Organization:
- Univ. of New Mexico, Albuquerque
- OSTI ID:
- 6807340
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 91:6; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400500* -- Photochemistry
ACRIDINES
AROMATICS
AZAARENES
AZINES
CONDENSED AROMATICS
DATA
DE-EXCITATION
DISPERSIONS
ELEMENTS
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
INFORMATION
LUMINESCENCE
MIXTURES
MULTIPLETS
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN
PHENANTHRENE
PHENAZINE
PHOSPHORESCENCE
PYRAZINES
PYRIDINES
RADIATIONLESS DECAY
SOLUTIONS
SOLVENTS
TRIPLETS