Fluorescence lifetime study of intermolecular coupling between biphenyl-ester moieties of a thermotropic liquid crystal

In Wook Hwang, Yong Rok Kim

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Using steady-state and time-resolved fluorescence spectroscopy, we investigated the intermolecular coupling between mesogenic biphenyl-ester moieties of a thermotropic liquid crystal under phase transition. In the crystalline-to-smectic C transition, a broad excitation band centered at 280 nm and a fluorescence redshift by 25 nm, followed by a drastic change in the fluorescence time-decay constant (from ∼90 to ∼230 ps), are consistently observed. These changes result from the intermolecular configurational change from biphenyl-biphenyl to biphenyl-ester. Emissions from intermolecular complexes such as J-aggregated biphenyls in crystalline and biphenyl-ester exciplexes in smectic C, smectic A, and isotropic phases are characterized.

Original languageEnglish
Pages (from-to)34-37
Number of pages4
JournalChemical Physics Letters
Volume571
DOIs
Publication statusPublished - 2013 May 20

Fingerprint

Thermotropic liquid crystals
esters
Esters
Fluorescence
liquid crystals
life (durability)
fluorescence
Crystalline materials
Fluorescence spectroscopy
decay
spectroscopy
excitation
diphenyl
Phase transitions

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

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Fluorescence lifetime study of intermolecular coupling between biphenyl-ester moieties of a thermotropic liquid crystal. / Hwang, In Wook; Kim, Yong Rok.

In: Chemical Physics Letters, Vol. 571, 20.05.2013, p. 34-37.

Research output: Contribution to journalArticle

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AB - Using steady-state and time-resolved fluorescence spectroscopy, we investigated the intermolecular coupling between mesogenic biphenyl-ester moieties of a thermotropic liquid crystal under phase transition. In the crystalline-to-smectic C transition, a broad excitation band centered at 280 nm and a fluorescence redshift by 25 nm, followed by a drastic change in the fluorescence time-decay constant (from ∼90 to ∼230 ps), are consistently observed. These changes result from the intermolecular configurational change from biphenyl-biphenyl to biphenyl-ester. Emissions from intermolecular complexes such as J-aggregated biphenyls in crystalline and biphenyl-ester exciplexes in smectic C, smectic A, and isotropic phases are characterized.

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