Počet záznamů: 1

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

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)_RID
Zdroj.dok.	Journal of Physical Chemistry A. - : American Chemical Society - ISSN 1089-5639 Roč. 119, č. 24 (2015), s. 6203-6214
Poč.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