TY - JOUR
T1 - Inclusion as a driving force for the intramolecular charge transfer (ICT) fluorescence of p-(N,N-diphenylamino)benzoic acid methyl ester (DPABME) in α-cyclodextrin (α-CD) aqueous solution
AU - Al-Hassan, Khader A.
AU - Saleh, Na'il
AU - Abu-Abdoun, Ideisan I.
AU - Yousef, Yaser A.
N1 - Funding Information:
Acknowledgment We would like to acknowledge Yarmouk University for financial support (grant no. 2007/14).
PY - 2008/8
Y1 - 2008/8
N2 - A 1:1 inclusion complex between p-(N,N-diphenylamino)benzoic acid methyl ester (DPABME) molecule and α-cyclodextrin (α-CD) in aqueous solution is formed with a stabilization constant of ca. 45.65 ± 3.59 M-1 at 25°C. The formation of the complex is accompanied by enhancement of the long wavelength fluorescence at 510 nm (attributed to intramolecular charge transfer (ICT) due to twisting) relative to the normal fluorescence at 420 nm. In water, the long-wavelength fluorescence is hidden under the red tail of the normal fluorescence band due to quenching by non-radiative transition. Inclusion by CD reduces quenching and thus constitutes a driving force for DPABME to emit at longer wavelength via ICT process.
AB - A 1:1 inclusion complex between p-(N,N-diphenylamino)benzoic acid methyl ester (DPABME) molecule and α-cyclodextrin (α-CD) in aqueous solution is formed with a stabilization constant of ca. 45.65 ± 3.59 M-1 at 25°C. The formation of the complex is accompanied by enhancement of the long wavelength fluorescence at 510 nm (attributed to intramolecular charge transfer (ICT) due to twisting) relative to the normal fluorescence at 420 nm. In water, the long-wavelength fluorescence is hidden under the red tail of the normal fluorescence band due to quenching by non-radiative transition. Inclusion by CD reduces quenching and thus constitutes a driving force for DPABME to emit at longer wavelength via ICT process.
KW - Cyclodextrins
KW - Fluorescence
KW - Guest-host inclusion
KW - Intramolecular charge transfer
KW - p-(N,N-diphenylamino)benzoic acid methyl ester (DPABME)
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U2 - 10.1007/s10847-008-9430-8
DO - 10.1007/s10847-008-9430-8
M3 - Article
AN - SCOPUS:46649107950
SN - 0923-0750
VL - 61
SP - 361
EP - 365
JO - Journal of Inclusion Phenomena and Macrocyclic Chemistry
JF - Journal of Inclusion Phenomena and Macrocyclic Chemistry
IS - 3-4
ER -