Medium effects on the fluorescence spectra of tertiary aliphatic amines in mixed solvents and supercritical fluids

Tsuguyoshi Toyooka; Shinsuke Ohchi; Yoshimi Sueishi; Shunzo Yamamoto; Okitsugu Kajimoto

doi:10.1016/j.jphotochem.2007.07.004

Medium effects on the fluorescence spectra of tertiary aliphatic amines in mixed solvents and supercritical fluids

Tsuguyoshi Toyooka, Shinsuke Ohchi, Yoshimi Sueishi, Shunzo Yamamoto, Okitsugu Kajimoto

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

Emission spectra of some tertiary amines were measured in cyclohexane (CH)-tetrahydrofuran (THF) mixtures and in supercritical fluids of CHF₃. The emission bands of these amines were found to show large successive red shifts with increasing concentration of polar solvent molecules. This finding was rationalized by considering the consecutive solvation of the polar molecules around the Rydberg excited state of the amine. In order to estimate the degree of solvation, the wavenumbers of the emission maxima were plotted as functions of the THF and CHF₃ concentrations. The changes in solvation number with increasing THF and CHF₃ concentrations were obtained from the spectral shifts by applying a calculation for the stepwise solvation model.

Original language	English
Pages (from-to)	260-265
Number of pages	6
Journal	Journal of Photochemistry and Photobiology A: Chemistry
Volume	193
Issue number	2-3
DOIs	https://doi.org/10.1016/j.jphotochem.2007.07.004
Publication status	Published - Jan 25 2008

Keywords

Fluorescence spectra
Medium effect
Mixed solvent
Stepwise solvation model
Supercritical fluid
Tertiary amines

ASJC Scopus subject areas

Chemistry(all)
Chemical Engineering(all)
Physics and Astronomy(all)

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10.1016/j.jphotochem.2007.07.004

Cite this

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title = "Medium effects on the fluorescence spectra of tertiary aliphatic amines in mixed solvents and supercritical fluids",

abstract = "Emission spectra of some tertiary amines were measured in cyclohexane (CH)-tetrahydrofuran (THF) mixtures and in supercritical fluids of CHF3. The emission bands of these amines were found to show large successive red shifts with increasing concentration of polar solvent molecules. This finding was rationalized by considering the consecutive solvation of the polar molecules around the Rydberg excited state of the amine. In order to estimate the degree of solvation, the wavenumbers of the emission maxima were plotted as functions of the THF and CHF3 concentrations. The changes in solvation number with increasing THF and CHF3 concentrations were obtained from the spectral shifts by applying a calculation for the stepwise solvation model.",

keywords = "Fluorescence spectra, Medium effect, Mixed solvent, Stepwise solvation model, Supercritical fluid, Tertiary amines",

author = "Tsuguyoshi Toyooka and Shinsuke Ohchi and Yoshimi Sueishi and Shunzo Yamamoto and Okitsugu Kajimoto",

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T1 - Medium effects on the fluorescence spectra of tertiary aliphatic amines in mixed solvents and supercritical fluids

AU - Toyooka, Tsuguyoshi

AU - Ohchi, Shinsuke

AU - Sueishi, Yoshimi

AU - Yamamoto, Shunzo

AU - Kajimoto, Okitsugu

PY - 2008/1/25

Y1 - 2008/1/25

N2 - Emission spectra of some tertiary amines were measured in cyclohexane (CH)-tetrahydrofuran (THF) mixtures and in supercritical fluids of CHF3. The emission bands of these amines were found to show large successive red shifts with increasing concentration of polar solvent molecules. This finding was rationalized by considering the consecutive solvation of the polar molecules around the Rydberg excited state of the amine. In order to estimate the degree of solvation, the wavenumbers of the emission maxima were plotted as functions of the THF and CHF3 concentrations. The changes in solvation number with increasing THF and CHF3 concentrations were obtained from the spectral shifts by applying a calculation for the stepwise solvation model.

AB - Emission spectra of some tertiary amines were measured in cyclohexane (CH)-tetrahydrofuran (THF) mixtures and in supercritical fluids of CHF3. The emission bands of these amines were found to show large successive red shifts with increasing concentration of polar solvent molecules. This finding was rationalized by considering the consecutive solvation of the polar molecules around the Rydberg excited state of the amine. In order to estimate the degree of solvation, the wavenumbers of the emission maxima were plotted as functions of the THF and CHF3 concentrations. The changes in solvation number with increasing THF and CHF3 concentrations were obtained from the spectral shifts by applying a calculation for the stepwise solvation model.

KW - Fluorescence spectra

KW - Medium effect

KW - Mixed solvent

KW - Stepwise solvation model

KW - Supercritical fluid

KW - Tertiary amines

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JO - Journal of Photochemistry and Photobiology A: Chemistry

JF - Journal of Photochemistry and Photobiology A: Chemistry

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Medium effects on the fluorescence spectra of tertiary aliphatic amines in mixed solvents and supercritical fluids

Abstract

Keywords

ASJC Scopus subject areas

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