SYSTEMATIC CHARACTERIZATION OF COUMARIN 6: FLUORESCENCE QUANTUM EFFICIENCY AND EXCITED STATE LIFETIMES IN VARIOUS SOLVENTS

Taylaine Aparecida Perucci; Thiago Cazati; Bruna B Postacchini

Título do Trabalho

Autores

Taylaine Aparecida Perucci
Thiago Cazati
Bruna B Postacchini

Modalidade

Pôster

Área temática

3) Design, Synthesis, and Characterization of Electronic/Optoelectronic Materials and Devices

Data de Publicação

17/05/2024

País da Publicação

Brasil

Idioma da Publicação

Inglês

Página do Trabalho

https://www.even3.com.br/anais/workshop-do-ineo-2024/795945-systematic-characterization-of-coumarin-6--fluorescence-quantum-efficiency-and-excited-state-lifetimes-in-various

ISBN

978-65-272-0462-6

Palavras-Chave

Photophysics, Coumarin 6, optical spectroscopy, fluorescence quantum efficiency, Lippert-Mataga equation

Resumo

Coumarin 6 has been widely used as a spectroscopic standard due to its remarkable quantum efficiency in singlet state formation. This compound has been systematically studied in various solvents and concentrations, including acetone, acetonitrile, ethyl alcohol, methyl alcohol, chloroform, dichloromethane, DMF, and THF. The fluorescence quantum efficiency was determined using the comparative method and excited state lifetimes. The study revealed that Coumarin 6 can serve as a reliable spectroscopic standard at concentrations ranging from 0.735E-06 mol/L to 2.20E-06 mol/L. This conclusion was drawn based on the absence of any changes in the shape of the optical absorption and fluorescence spectra within this concentration range. Additionally, there was no significant variation observed in the efficiency or lifetime of the excited state. One of the key findings of this research was the identification of solvent polarity as a critical factor affecting the behavior of Coumarin 6. The Stokes shift, as a function of solvent polarity (Lippert-Mataga diagram), showed a linear trend even for protic solvents. Furthermore, no aggregates or hydrogen bonds were formed at the concentrations and solvent conditions tested. Interestingly, higher quantum efficiency of fluorescence was noted in more polar solvents. The excited state lifetimes of Coumarin 6 ranged from 2.3 ns to 2.6 ns in different solvents, with nonradiative constants being predominant in methanol and acetonitrile, while radiative constants were more prominent in chloroform and dichloromethane. The molar absorption coefficients varied depending on the solvent, ranging from (38.1 ± 1.6)E+3 L.mol-1.cm-1 to (95.31 ± 1.1)E+3 L.mol-1.cm-1. Understanding the photophysical parameters of reference standards is essential for accurately determining the photophysical properties of new compounds. Moreover, controlling the photophysical processes of any chromophore can lead to the development of innovative technological applications for organic chromophores. Coumarin 6, as a chromophore, has diverse applications, including its use as a fluorescent probe for investigating environmental polarity, enhancing chemical reaction efficiency, tracking nanodrugs, producing active layers in solar cells, and other photonic processes.

Título do Evento: Workshop do INEO 2024
Cidade do Evento: Nazaré Paulista
Título dos Anais do Evento: Anais do Workshop INEO 2024
Nome da Editora: Even3
Meio de Divulgação: Meio Digital

Como citar

PERUCCI, Taylaine Aparecida; CAZATI, Thiago; POSTACCHINI, Bruna B. SYSTEMATIC CHARACTERIZATION OF COUMARIN 6: FLUORESCENCE QUANTUM EFFICIENCY AND EXCITED STATE LIFETIMES IN VARIOUS SOLVENTS.. In: Anais do Workshop INEO 2024. Anais...Nazaré Paulista(SP) Hotel Estância Atibainha, 2024. Disponível em: https//www.even3.com.br/anais/workshop-do-ineo-2024/795945-SYSTEMATIC-CHARACTERIZATION-OF-COUMARIN-6--FLUORESCENCE-QUANTUM-EFFICIENCY-AND-EXCITED-STATE-LIFETIMES-IN-VARIOUS. Acesso em: 02/08/2025