NDLI: Mechanism of singlet-oxygen induced delayed fluorescence of bacteriopheophytin in laser excitation

Content Provider	Springer Nature Link
Author	Bashtav, M. E. Drozdova, N. N. Krasvskii, A. A.
Copyright Year	1999
Abstract	The relative intensity of photosensitized phosphorescence of singlet oxygen ($^{1}$O$_{2}$) at 1270 nm (L$_{1270}$) and$^{1}$O$_{2}$-induced delayed fluorescence (L$_{df}$) of bacteriopheophytin a (BPh) (770 nm) in air-saturated solutions of BPh in hexafluorobenzene in excitation by 337-nm pulses of a nitrogen laso is investigated. It is established that L$_{df}$≪L$_{1270}$. The ratio of the initial intensity of delayed fluorescence and phosphorescence of$^{1}$O$_{2}$(L$_{df}$)$_{0}$/(L$_{1270}$)$_{0}$ changed from 0.02 to 0.30 as a function of the energies of laser pulses (2.5–5.0 mJ/cm$^{1}$) and the BPh concentration (6–18 μM). As the index of quantum efficiency of the delayed fluorescence, the authors used the coefficient $$\alpha = [(L_{df} )_0 /(L_{1{\text{270}}} )_0 ]k_r /(\gamma f[^1 O_{\text{2}} ]_0 [Bpn),$$ where [$^{1}$O$_{2}$]$_{0}$ is the initial concentration of$^{1}$O$_{2}$ after the laser burst; [Bpn] is the concentration of BPh; k$_{r}$ is the constant of the rate of$^{1}$O$_{2}$ radiative deactivation in the solvent under study; γf is the quantum yield of BPh fluorescence. It is established that this coefficient is smaller by a factor of ∼2000 than in phthalocyanine, while its absolute value is ∼2·10$^{10}$M$^{−2}$sec$^{−1}$. The saturation of BPh solutions with oxygen at atmospheric pressure is shown to lead to a fivefold attenuation of the delayed fluorescence as compared to air-saturated solutions. The possibility of BPh triplet molecules being involved in the radiation of delayed fluorescence of the pigment is discussed.
Starting Page	550
Ending Page	555
Page Count	6
File Format	PDF
ISSN	00219037
Journal	Journal of Applied Spectroscopy
Volume Number	66
Issue Number	4
e-ISSN	15738647
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	1999-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	singlet molecular oxygen delayed fluorescence phosphorescence bacteriopheophytin phthalocyanine Analytical Chemistry Atomic and Molecular Structure and Spectra
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Condensed Matter Physics

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