start-ver=1.4
cd-journal=joma
no-vol=162
cd-vols=
no-issue=2-3
article-no=
start-page=449
end-page=456
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2004
dt-pub=20043
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Effects of alcohols on emission spectra of toluene-triethylamine mixtures in THF: separation into polar and hydrogen-bonding interactions
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=<p>The emission spectra of toluene (T)–triethylamine (TEA) systems were measured under conditions of steady-state illumination in some protic and aprotic solvent–THF mixtures. The fluorescence spectrum of the T–TEA system in THF could be separated into three component bands (band A at 279 nm (fluorescence of T), band B at 336 nm (fluorescence of TEA) and band C at 373 nm (emission from an intermolecular exciplex)). The intensities of bands B and C decreased with increasing solvent polarity. The decrease in the intensities of bands B and C is considered to be caused by the enhanced conversion of the exciplex to an ion-pair with increase in solvent polarity. The intensities of bands B and C also decreased owing to the hydrogen-bonding interaction between TEA and protic solvents, but in this case the intensity of band A increased. Acetonitrile only has a polar effect and trichloroacetic acid only has a hydrogen-bonding (or protonation) effect, while alcohols have both effects. The equilibrium constants for the formation of intermolecular hydrogen-bonded complexes of TEA with alcohols were estimated from the changes in the intensity of band A. The hydrogen-bonding and polar effects of alcohols on the intensities of bands B and C could be evaluated separately. The ratio of the hydrogen-bonding effect to the polar effect of alcohols was observed to increase with increasing vol.% of alcohol.</p>
en-copyright=
kn-copyright=

en-aut-name=XieGuobin
en-aut-sei=Xie
en-aut-mei=Guobin
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=SueishiYoshimi
en-aut-sei=Sueishi
en-aut-mei=Yoshimi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=YamamotoShunzo
en-aut-sei=Yamamoto
en-aut-mei=Shunzo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

affil-num=1
en-affil=
kn-affil=Okayama University

affil-num=2
en-affil=
kn-affil=Okayama University

affil-num=3
en-affil=
kn-affil=Okayama University
en-keyword=solvent effect
kn-keyword=solvent effect
en-keyword=polar effect
kn-keyword=polar effect
en-keyword=hydrogen-bonding
kn-keyword=hydrogen-bonding
en-keyword=fluorescence
kn-keyword=fluorescence
en-keyword=exciplex
kn-keyword=exciplex
END