start-ver=1.4
cd-journal=joma
no-vol=162
cd-vols=
no-issue=1
article-no=
start-page=73
end-page=79
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2004
dt-pub=20042
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Separation into polar and hydrogen-bonding factors of the effects of alcohols on the emission spectrum of 4-phenyl-1-N,N-dimethylaminobutane in THF
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=<p>The effects of the additions of protic and aprotic polar solvents on the emission spectrum of 4-phenyl-1-N,N-dimethylaminobutane (PDAB) in THF have been studied under conditions of steady-state illumination. The fluorescence spectrum of PDAB in THF was reported to consist of three component bands (band A at 285 nm (fluorescence of the phenyl group), band B at 343 nm (fluorescence of the amino group) and band C at 385 nm (emission from an intramolecular exciplex)). The intensities of bands B and C decreased with increasing solvent polarity. They also decreased owing to the hydrogen-bonding interaction between the amino group in PDAB and protic solvents, but in this case the intensity of band A was found to increase. Acetonitrile has only a polar effect and trichloroacetic acid only a hydrogen-bonding (or protonation) effect, while alcohols have both effects. The equilibrium constants for the formation of intermolecular hydrogen-bonded complexes of the amino group with alcohols were estimated from the intensity change of band A. The hydrogen-bonding and polar effects of alcohols on the intensities of bands B and C could be separately evaluated. The decrease in the intensities of bands B and C with increasing solvent polarity in THF-AN and THF-alcohol mixtures is considered to be caused by the conversion of the exciplex to an ion-pair enhanced by the increase in solvent polarity.</p>
en-copyright=
kn-copyright=

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

en-aut-name=NakamuraMayuko
en-aut-sei=Nakamura
en-aut-mei=Mayuko
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
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=3
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=4
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 Univresity

affil-num=4
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