The quantum yield of triplet formation and triplet lifetime of pyridine in the liquid phase by the two-photon-excited time-resolved thermal lens method

1988 ◽  
Vol 153 (1) ◽  
pp. 27-32 ◽  
Author(s):  
Masahide Terazima ◽  
Tohru Azumi
Keyword(s):  
Liquid Phase ◽  
Quantum Yield ◽  
Thermal Lens ◽  
Time Resolved ◽  
Two Photon ◽  
Triplet Formation ◽  
Triplet Lifetime

Substituted Phosphorous Triazatetrabenzocorroles: Correlation Between Structure and Excited State Properties

2009 ◽  
Vol 62 (5) ◽  
pp. 434 ◽  
Author(s):  
Xian-Fu Zhang ◽  
Yakuan Chang ◽  
Yanling Peng ◽  
Fushi Zhang
Keyword(s):  
Quantum Yield ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Photophysical Properties ◽  
Laser Flash ◽  
Time Resolved Fluorescence ◽  
Absorption Properties ◽  
Strong Electron ◽  
Time Resolved ◽  
Triplet Formation

The photophysical properties of five novel phthalocyanine analogues, dihydroxy phosphorus(v) triazatetrabenzocorrole (PTBC) substituted with –NO2, –SO3H, OiPr, and –NH2, respectively, were studied by a combination of absorption, steady-state emission, time-resolved fluorescence, and laser flash photolysis. All substituents, even for the strong electron-donating –NH2, cause only a slight red shift of their absorption and emission maxima. These complexes are generally monomeric in organic solution, whereas the sulfonated derivative, PTBC(SO3H)4, slightly aggregates in aqueous buffer. Distinct from phthalocyanines, PTBCs substituted with –NO2 or –NH2 still show high photo activities. The electron-withdrawing –NO2 and –SO3H decrease the fluorescence quantum yield but increase the triplet formation yield to 0.76 and 0.82, respectively. All PTBCs have long triplet lifetimes and hence generate singlet oxygen efficiently with a quantum yield from 0.43 to 0.75. Together with the ground-state absorption properties, the results suggest that these PTBCs may be used as excellent photosensitizers for photodynamic therapy.

Syntheses and photochemical properties of a tribenzo-naphtho-condensed porphyrazinatozinc complex

2003 ◽  
Vol 07 (09) ◽  
pp. 630-636 ◽  
Author(s):  
Marcelo M. M. Pelisson ◽  
Fernanda M. Tomé ◽  
Milton Beltrame ◽  
Andreza R. Simioni ◽  
Antonio C. Tedesco
Keyword(s):  
Spectral Analysis ◽  
Steady State ◽  
Quantum Yield ◽  
Fluorescence Quantum Yield ◽  
Spectroscopic Analysis ◽  
Time Resolved ◽  
H Nmr ◽  
Elemental Analyses ◽  
Photochemical Properties ◽  
Triplet Lifetime

The synthesis of a zinc derivative of tribenzonaphthoporphyrazinato ( Zn -tri- PcNc ) obtained from 6-carboxymethyl-2,3-dicyanonaphthalene and phthalonitrile is described. This new phthalocyanine ( Pc ) compound was characterized by 1 H NMR, elemental analyses, IR and UV-vis. The spectroscopic analysis of this compound show an electronic spectrum in DMSO with characteristic bands in the Soret and ϱ region. Steady state and time-resolved spectral analysis revealed a fluorescence quantum yield and a fluorescence lifetime of Φf=0.22 and τf = 2.56 ns respectively, in agreement with other Pc derivatives. This compound also shows a triplet lifetime in air satured solutions of 1.06 μs and a transient with the maximum absortion located at 610 nm, 120 nm shifted to the red compared to the triplet observed by other Pc compounds.

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