Femtosecond to nanosecond studies of octupolar molecules and their quadrupolar and dipolar analogues

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F17%3A39910728" target="_blank" >RIV/00216275:25310/17:39910728 - isvavai.cz</a>

Result on the web

<a href="http://doi.org/10.1039/C7CP01463E" target="_blank" >http://doi.org/10.1039/C7CP01463E</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/c7cp01463e" target="_blank" >10.1039/c7cp01463e</a>

Result language

angličtina

Original language name

Femtosecond to nanosecond studies of octupolar molecules and their quadrupolar and dipolar analogues

Original language description

The photophysical properties of two octupolar (T) molecules and of their linear (L) and quadrupolar (Q) analogues are studied by means of steady state and femtosecond to nanosecond spectroscopy. The compounds bear a triphenylamine donor, cyano acceptors and acetylenic (series 1) or olefin (series 2) pi-bridges. In the octupolar compound of series 2 (2T), fluorescence is emitted from an excited state localized on a single branch, while in that of series 1 (1T), the emitting state is delocalized among branches pointing to a reduced excited state polarity. Excited state dynamics in series 1 has shown an increase of lifetime with solvent polarity. In the branched compounds of series 2, multiexponential dynamics in polar solvents is exhibited indicating a distribution of emitting geometries. Femtosecond anisotropy in 1T indicates incoherent excitation transfer on the timescale of a few ps, in agreement with the hopping time predicted by the Forster model. However, no hopping mechanism is observed in 2T possibly because of an increased intramolecular charge transfer leading to a low energy relaxed excited state localized on a single branch.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10401 - Organic chemistry

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Physical Chemistry Chemical Physics

ISSN

1463-9076

e-ISSN

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Volume of the periodical

19

Issue of the periodical within the volume

25

Country of publishing house

GB - UNITED KINGDOM

Number of pages

13

Pages from-to

16485-16497

UT code for WoS article

000404530600021

EID of the result in the Scopus database

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