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Origin of the Reversible Thermochromic Properties of Polydiacetylenes Revealed by Ultrafast Spectroscopy

Title
Origin of the Reversible Thermochromic Properties of Polydiacetylenes Revealed by Ultrafast Spectroscopy
Authors
Baek, JunwooJoung, Joonyoung F.Lee, SongyiRhee, HanjuKim, Myung HwaPark, SungnamYoon, Juyoung
Ewha Authors
윤주영김명화
SCOPUS Author ID
윤주영scopus; 김명화scopus
Issue Date
2016
Journal Title
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
ISSN
1948-7185JCR Link
Citation
vol. 7, no. 2, pp. 259 - 265
Publisher
AMER CHEMICAL SOC
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Polydiacetylenes (PDAs) with thermochromic properties undergo colorimetric transitions when the external temperature is varied. This capability has the potential to enable these materials to be used as temperature sensors. These thermochromic properties of PDAs stem from their temperature-dependent optical properties. In this work, we studied the temperature-dependent optical properties of Bis-PDA-Ph, which exhibits reversible thermochromic properties, and PCDA PDA, which exhibits irreversible thermochromic properties, by UV-visible absorption and femtosecond transient absorption spectroscopy. Our results indicate that the electronic relaxation of PDAs occurs via an intermediate state in cases where the material exhibits reversible thermochromic properties, whereas the excited PDAs relax directly back to the ground state when irreversible thermochromic properties are observed. The existence of this intermediate state in the electronic relaxation of PDAs thus plays an important role in determining their thermochromic properties. These results are very important for both understanding and strategically modulating the thermochromic properties of PDAs.
DOI
10.1021/acs.jpclett.5b02671
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자연과학대학 > 화학·나노과학전공 > Journal papers
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