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Baek J, Joung JF, Lee S, et al. Origin of the Reversible Thermochromic Properties of Polydiacetylenes Revealed by Ultrafast Spectroscopy. J Phys Chem Lett. 2016;7(2):259-65doi: 10.1021/acs.jpclett.5b02671.
Baek, J., Joung, J. F., Lee, S., Rhee, H., Kim, M. H., Park, S., & Yoon, J. (2016). Origin of the Reversible Thermochromic Properties of Polydiacetylenes Revealed by Ultrafast Spectroscopy. The journal of physical chemistry letters, 7(2), 259-65. https://doi.org/10.1021/acs.jpclett.5b02671
Baek, Junwoo, et al. "Origin of the Reversible Thermochromic Properties of Polydiacetylenes Revealed by Ultrafast Spectroscopy." The journal of physical chemistry letters vol. 7,2 (2016): 259-65. doi: https://doi.org/10.1021/acs.jpclett.5b02671
Baek J, Joung JF, Lee S, Rhee H, Kim MH, Park S, Yoon J. Origin of the Reversible Thermochromic Properties of Polydiacetylenes Revealed by Ultrafast Spectroscopy. J Phys Chem Lett. 2016 Jan 21;7(2):259-65. doi: 10.1021/acs.jpclett.5b02671. Epub 2016 Jan 05. PMID: 26719954.
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J Phys Chem Lett. 2016 Jan 21;7(2):259-65. doi: 10.1021/acs.jpclett.5b02671. Epub 2016 Jan 05.

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

The journal of physical chemistry letters

Junwoo Baek, Joonyoung F Joung, Songyi Lee, Hanju Rhee, Myung Hwa Kim, Sungnam Park, Juyoung Yoon

Affiliations

  1. Department of Chemistry, Korea University , Seoul 136-701, Korea.
  2. Department of Chemistry and Nano Science, Ewha Womans University , Seoul, 120-750, Korea.
  3. Space-Time Resolved Molecular Imaging Research Team, Korea Basic Science Institute , Seoul 136-713, Korea.

PMID: 26719954 DOI: 10.1021/acs.jpclett.5b02671

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.

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