Study of photoreduction kinetics of xanthene dyes with intersystem crossing from upper triplet states

2007 ◽  
Author(s):  
A. Sizykh ◽  
E. Slyusareva ◽  
K. Tarbetskaya
Keyword(s):  
Intersystem Crossing ◽  
Triplet States ◽  
Xanthene Dyes ◽  
Kinetics Of

scholarly journals Intersystem crossing rates of single perylene molecules in ortho-dichlorobenzene

2016 ◽  
Vol 18 (26) ◽  
pp. 17655-17659 ◽  
Author(s):  
Nico R. Verhart ◽  
Pedro Navarro ◽  
Sanli Faez ◽  
Michel Orrit
Keyword(s):  
Optical Switching ◽  
Intersystem Crossing ◽  
Triplet States ◽  
Spin States ◽  
Molecular Fluorescence

Triplet states can be interesting for optical switching of molecular fluorescence as well as quantum experiments relying on the manipulation of spin states.

Triplet state quantum yields for some arom atic hydrocarbons and xanthene dyes in dilute solution

1967 ◽  
Vol 299 (1458) ◽  
pp. 348-353 ◽  
Keyword(s):  
Triplet State ◽  
State Formation ◽  
Heavy Atom ◽  
Quantum Yields ◽  
Triplet States ◽  
Dilute Solution ◽  
Perturbation Techniques ◽  
Excited Singlet ◽  
Xanthene Dyes ◽  
Extinction Coefficients

Quantum yields of triplet state formation and extinction coefficients of the triplet states have been determined by direct depletion methods for solutions of anthracene, phenanthrene, 1,2,5,6-dibenzanthracene, fluorescein, dibromofluorescein, eosin and erythrosin. The values obtained for the hydrocarbons are in reasonable agreement with those obtained by other workers using energy transfer and heavy atom perturbation techniques. In all cases which we have studied, the sum of the quantum yields of fluorescence and triplet state formation is equal to unity within the limits of experimental error, showing that radiationless transfer from the excited singlet to the ground state is negligible.

Protonation of some non-transition metal phthalocyanines — spectral and photophysicochemical consequences

2012 ◽  
Vol 16 (07n08) ◽  
pp. 885-894 ◽  
Author(s):  
Abimbola O. Ogunsipe ◽  
Mopelola A. Idowu ◽  
Taofeek B. Ogunbayo ◽  
Isaac A. Akinbulu
Keyword(s):  
Transition Metal ◽  
Rate Constant ◽  
Rate Equation ◽  
Aluminum Chloride ◽  
Ground State ◽  
Triplet States ◽  
Metal Phthalocyanines ◽  
Excited Triplet ◽  
Kinetics Of ◽  
Excited Triplet States

The photophysics and photochemistry of phthalocyanine complexes of magnesium (MgPc), aluminum chloride (ClAlPc) and zinc (ZnPc) are studied in N,N′-dimethylformamide (DMF). The values obtained for the photophysical and photochemical parameters are normal for simple metallophthalocyanine (MPc) complexes. Protonation of the azomethine bridges reduced the photoactivities of the complexes considerably; however the excited triplet states of the protonated species are more stable towards ground state oxygen. The interaction of the non-protonated MPcs with ground state oxygen is shown to be diffusion-assisted, with bimolecular rate constant values of the order of 1010 M-1.s-1. MgPc could not be protonated; it was easily demetalated by the protonating acid. The kinetics of the demetalation yielded the rate equation: Rate = 0.1[MgPc][H+]2/3

Intersystem crossing to higher triplet states in isolated molecules

1973 ◽  
Vol 22 (1) ◽  
pp. 150-153 ◽  
Author(s):  
U. Laor ◽  
J.C. Hsieh ◽  
P.K. Ludwig
Keyword(s):  
Intersystem Crossing ◽  
Triplet States ◽  
Isolated Molecules
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