Kinetics of the Photoexcited States in Thin Films of Metallo-Supramolecular Polymers With Ditopic Thiophene-Bridged Terpyridine Ligands.

Autor:	Menšík M; Institute of Macromolecular Chemistry, Czech Academy of Sciences, Prague, Czechia., Rais D; Institute of Macromolecular Chemistry, Czech Academy of Sciences, Prague, Czechia., Thottappali MA; Institute of Macromolecular Chemistry, Czech Academy of Sciences, Prague, Czechia.; Faculty of Mathematics and Physics, Charles University, Prague, Czechia., Güloğlu P; Institute of Macromolecular Chemistry, Czech Academy of Sciences, Prague, Czechia., Toman P; Institute of Macromolecular Chemistry, Czech Academy of Sciences, Prague, Czechia., Vohlídal J; Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University, Prague, Czechia., Pfleger J; Institute of Macromolecular Chemistry, Czech Academy of Sciences, Prague, Czechia.
Jazyk:	angličtina
Zdroj:	Frontiers in chemistry [Front Chem] 2022 Jan 20; Vol. 9, pp. 766121. Date of Electronic Publication: 2022 Jan 20 (Print Publication: 2021).
DOI:	10.3389/fchem.2021.766121
Abstrakt:	Managing the excited-state decay by a supramolecular structure is a crucial issue for organic photovoltaics. We show that in thin films of metallo-supramolecular polymers made of bis(terpyridine-4'-yl)terthiophenes and Z n 2 + coupling ions, the photoexcited states generated by ultrashort laser pulses at the wavelength of 440 nm decay by the bi-molecular annihilation predominantly controlled by the Förster transfer between singlet states. During this bi-molecular annihilation of singlet states, intermediate hot triplet pairs are formed, which subsequently dissociate into long-living diffusing triplet states. It explains a significant shortening of the triplet state rise time with increasing pump fluence. The diffusion coefficient of triplets showed power-law time dependence, with its exponent proportional to the pump fluence, decreasing thus the diffusivity of triplets. Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. (Copyright © 2022 Menšík, Rais, Thottappali, Güloğlu, Toman, Vohlídal and Pfleger.)
Databáze:	MEDLINE
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