Anais do Workshop do INEO 2026

SUPPRESSION OF Π-STACKED AGGREGATES AND POWER-CONTROLLED EXCIPLEX FORMATION IN THIOPHENE–BENZENE–THIOPHENE MONOMERS

Publicado em 27/05/2026 - ISBN: 978-65-272-2467-9

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Título do Trabalho
SUPPRESSION OF Π-STACKED AGGREGATES AND POWER-CONTROLLED EXCIPLEX FORMATION IN THIOPHENE–BENZENE–THIOPHENE MONOMERS
Autores
  • Giovani Bortolini De Oliveira
  • Bruno Souza Zanatta
  • Raigna Augusta Da Silva
  • Thibaut Jarrosson
  • Jean-Pierre Lère-Porte
  • Françoise Serein-Spirau
  • Sandra Lúcia Nogueira
  • Alexandre Marletta
Modalidade
Pôster - resumo
Área temática
Materiais e biomateriais
Data de Publicação
27/05/2026
País da Publicação
Brasil
Idioma da Publicação
pt-BR
Página do Trabalho
https://www.even3.com.br/anais/workshop-do-ineo-2026/1460690-suppression-of-p-stacked-aggregates-and-power-controlled-exciplex-formation-in-thiophenebenzenethiophene-monom
ISBN
978-65-272-2467-9
Palavras-Chave
Power-Dependent, phototoluminescence, molecular aggregation, exciplex.
Resumo
Abstract We present a comprehensive photophysical investigation of five thiophene–benzene–thiophene (TBT) monomers bearing distinct lateral side chains, elucidating how excitation power modulates their aggregation dynamics. Steady-state photoluminescence (PL) reveals two emissive contributions at 418 and 495 nm whose intensity ratio varies systematically with excitation powers from 8 to 3098 µW. Time-resolved PL assigns these bands to monomeric and aggregate-like species. Power-cycling experiments confirm complete spectral reversibility, excluding thermal or concentration-driven artifacts. Simulations based on Fermi’s Golden Rule combined with a two-species population model show that the zero-phonon transition energy remains invariant with excitation power, demonstrating that spectral evolution arises solely from population redistribution rather than energetic shifts. The lateral side chains suppress p-stacked aggregation while promoting excited–ground-state interactions that favor exciplex formation. These results establish a mechanistic basis for power-controlled emission in TBT systems and offer design guidelines for tuning excited-state interactions in p-conjugated materials. Reference 1. Lin, S.H. “Spectral band shape of absorption and emission of molecules in dense media”. Theoret. Chim. Acta. 1968. 2. Oliveira, G. B. Zanatta, B. S. Therézio, E. M. Marletta, A. “Do Passado ao Futuro: A Evolução da Espectroscopia e as Simulações Computacionais dos Espectros de Emissão” Jornal Mato-Grossense de Física. 2024. DOI: doi.org/10.59396/29651964JMFis.7-2.56.2024. 3. Lemmer, U. S. Heun, R.F. Mahrt, U. Scherf, M. Hopmeier, U. Siegner, E.O. Gobel, K. Mullen, H. Bassler. “Aggregate fluorescence in conjugated polymers”. Chemical Physics Letters. 1995. DOI: doi.org/10.1016/0009-2614(95)00512-3. 4. Chang-Ki Moon, Jin-Suk Huh, Jae-Min Kim, and Jang-Joo Kim. “Electronic Structure and Emission Process of Excited Charge Transfer States in Solids”. Chemistry of materials. 2018. DOI: doi.org/10.1021/acs.chemmater.8b02011. 5. Suqian Ma, Sijia Du, Guocui Pan, Shuting Dai, Bin Xu, Wenjing Tian. “Organic molecular aggregates: From aggregation structure to emission property”. Aggregate. 2021. DOI: doi.org/10.1002/agt2.96. Acknowledgements I thanks INEO, FAPESP (2025/27044-5) , FAPEMIG, CNPq (408449/2024-1) and CAPES for their assistance and support in the development of this work
Título do Evento
Workshop do INEO 2026
Cidade do Evento
Nazaré Paulista
Título dos Anais do Evento
Anais do Workshop do INEO 2026
Nome da Editora
Even3
Meio de Divulgação
Meio Digital

Como citar

OLIVEIRA, Giovani Bortolini De et al.. SUPPRESSION OF Π-STACKED AGGREGATES AND POWER-CONTROLLED EXCIPLEX FORMATION IN THIOPHENE–BENZENE–THIOPHENE MONOMERS.. In: Anais do Workshop do INEO 2026. Anais...Nazaré Paulista(SP) Hotel Estância Atibainha, 2026. Disponível em: https//www.even3.com.br/anais/workshop-do-ineo-2026/1460690-SUPPRESSION-OF-P-STACKED-AGGREGATES-AND-POWER-CONTROLLED-EXCIPLEX-FORMATION-IN-THIOPHENEBENZENETHIOPHENE-MONOM. Acesso em: 10/08/2026

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