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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F03%3A00000537" target="_blank" >RIV/00216275:25310/03:00000537 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21340/03:04095692

Výsledek na webu

—

DOI - Digital Object Identifier

—

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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 emittingstate 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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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 emittingstate 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.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CF - Fyzikální chemie a teoretická chemie

OECD FORD obor

—

Projekt

<a href="/cs/project/ME%20559" target="_blank" >ME 559: Fotofyzika funkčních molekul a spektroskopie pro molekulární elektroniku</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2003

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

J. Physical Chem. A

ISSN

1089-5639

e-ISSN

—

Svazek periodika

107

Číslo periodika v rámci svazku

46

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

7

Strana od-do

9740-9746

Kód UT WoS článku

—

EID výsledku v databázi Scopus

—