Publikace detail

Photophysics of 3-Substituted Benzanthrones: Substituent and Solvent Control of Intersystem Crossing

Rok: 2003

Druh publikace: článek v odborném periodiku

Název zdroje: Journal of Physical Chemistry A

Název nakladatele: American Chemical Society

Místo vydání: Washington

Strana od-do: 9740-9746

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
cze
eng	Photophysics of 3-Substituted Benzanthrones: Substituent and Solvent Control of Intersystem Crossing	The solvent dependence of absorption and fluorescence spectra, fluorescence lifetimes, and quantum yields of various 3-substituted benzanthrone derivatives have been investigated. A consistent correlation between fluorescence quantum yields and emitting state energy has been found that holds for all 6 derivatives in 11 solvents. The experimental data tohether with the results of semiempirical quantum chemical calculations indicate that the main quenching chanel of the fluorescent S1(pi, pi) excited state is intersystem crossing to an upper (n, pi) triplet state, Tn. The rate constant and efficiency of intersystem crossing between these two states are strongly influenced by the substituent and by the solvent polarity, as both modulate the singlet state energy and the S1 - Tn energy gap. The rate constant of direct S1 - T1 intersystem crossing is small in most systems but appears to increase with a decrease in the energy of the S1 state.	Absorption spectra, Fluorescence spectra, Fluorescence lifetimes, Quantum yields, 3-Benzanthrone derivatives, Semiempirical quantum chemical calculations, Rate constant, Efficiency of intersystem crossing.

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