NDLI: Quenching of the triplet state of tetrapyrrole molecules by Ni-, Ag-, and Fe-porphyrins and formation of excited complexes and photoproducts

Content Provider	Springer Nature Link
Author	Sapuv, V. V.
Copyright Year	2000
Abstract	Using the method of pulse photolysis, we studied the quenching of the triplet state (TS) of a number of tetrapyrrole molecules by complexes of Ni-, Ag-, and Fe-porphyrins in liquid solutions at a temperature of ∼298 K under the conditions where the kinetics are markedly affected by the triplet-triplet annihilation of the molecules of energy donors. In the analysis of experimental data, derivatives for the time dependences of the optical density of the triplet-triplet absorption were determined. The triple-triplet annihilation process was considered for the case of the formation of excited a triplet-triplet complexes of two molecules in the triplet state. A procedure of determining the rate constant for the quenching of the triplet state by foreign molecules (K$_{q}$) under the effect of such triplet-triplet annihilation process is proposed and the values of K$_{q}$ are obtained. For some donor-quencher pairs it is found that the kinetics of the triplet-state deactivation are affected by the formation of short-lived particles with lifetimes both shorter and longer than the triplet-state lifetimes. The conclusion is drawn that such particles are respectively the excited complexes of interacting molecules or ion radicals formed from such complexes in polar solvents.
Starting Page	405
Ending Page	411
Page Count	7
File Format	PDF
ISSN	00219037
Journal	Journal of Applied Spectroscopy
Volume Number	67
Issue Number	3
e-ISSN	15738647
Language	English
Publisher	Springer US
Publisher Date	2000-01-01
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	triplet-triplet annihilation quenching of the triplet state excited complexes Analytical Chemistry Atomic and Molecular Structure and Spectra
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Condensed Matter Physics

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