Počet záznamů: 1
Time-resolved transient optical absorption study of bis(terpyridyl)oligothiophenes and their metallo-supramolecular polymers with Zn(II) ion couplers
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SYSNO ASEP 0445857 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Time-resolved transient optical absorption study of bis(terpyridyl)oligothiophenes and their metallo-supramolecular polymers with Zn(II) ion couplers Tvůrce(i) Rais, David (UMCH-V) RID
Menšík, Miroslav (UMCH-V) RID
Štenclová-Bláhová, P. (CZ)
Svoboda, J. (CZ)
Vohlídal, J. (CZ)
Pfleger, Jiří (UMCH-V) RIDZdroj.dok. Journal of Physical Chemistry A. - : American Chemical Society - ISSN 1089-5639
Roč. 119, č. 24 (2015), s. 6203-6214Poč.str. 12 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova conjugated polymers ; supramolecular structures ; structure-property relations Vědní obor RIV CD - Makromolekulární chemie CEP GAP108/12/1143 GA ČR - Grantová agentura ČR Institucionální podpora UMCH-V - RVO:61389013 UT WOS 000356753600007 EID SCOPUS 84935024578 DOI 10.1021/jp512213s Anotace 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. Pracoviště Ústav makromolekulární chemie Kontakt Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Rok sběru 2016
Počet záznamů: 1