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Time-resolved transient optical absorption study of bis(terpyridyl)oligothiophenes and their metallo-supramolecular polymers with Zn(II) ion couplers

SYSNO ASEP	0445857
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Time-resolved transient optical absorption study of bis(terpyridyl)oligothiophenes and their metallo-supramolecular polymers with Zn(II) ion couplers
Author(s)	Rais, David (UMCH-V)_RID Menšík, Miroslav (UMCH-V)_RID Štenclová-Bláhová, P. (CZ) Svoboda, J. (CZ) Vohlídal, J. (CZ) Pfleger, Jiří (UMCH-V)_RID
Source Title	Journal of Physical Chemistry A. - : American Chemical Society - ISSN 1089-5639 Roč. 119, č. 24 (2015), s. 6203-6214
Number of pages	12 s.
Language	eng - English
Country	US - United States
Keywords	conjugated polymers ; supramolecular structures ; structure-property relations
Subject RIV	CD - Macromolecular Chemistry
R&D Projects	GAP108/12/1143 GA ČR - Czech Science Foundation (CSF)
Institutional support	UMCH-V - RVO:61389013
UT WOS	000356753600007
EID SCOPUS	84935024578
DOI	10.1021/jp512213s
Annotation	Alpha,omega-Bis(terpyridyl)oligothiophenes spontaneously assemble with Zn(II) ions giving conjugated constitutional dynamic polymers (dynamers) of the metallo-supramolecular class, which potentially might be utilized in optoelectronics. Their photophysical properties, which are of great importance in this field of application, are strongly influenced by the dynamic morphology. It was assessed in this study by using ultrafast pump probe optical absorption spectroscopy. We identified and characterized relaxation processes running in photoexcited molecules of these oligomers and dynamers and show impacts of disturbed coplanarity of adjacent rings (twisting the thiophene thiophene and thiophene terpyridyl bonds by attached hexyl side groups) and Zn(II) ion couplers on these processes. Major effects are seen in the time constants of rotational relaxation, intersystem crossing, and de-excitation lifetimes. The photoexcited states formed on different repeating units within the same dynarner chain do not interact with each other even at very high excitation density. The method is presented that allows determining the equilibrium fraction of unbound oligothiophene species in a dynamer solution, from which otherwise hardly accessible values of the average degree of polymerization of constitutionally dynamic chains in solution can be estimated.
Workplace	Institute of Macromolecular Chemistry
Contact	Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358
Year of Publishing	2016

Number of the records: 1