TY - JOUR
T1 - Thermal energy assisted heavy atom effect
T2 - Fluorescence quenching of 9-cyanoanthracene in the supercritical fluid of Xe
AU - Maeda, Makoto
AU - Graf, Urs
AU - Niikura, Hiromichi
AU - Okamoto, Masami
AU - Hirayama, Satoshi
N1 - Funding Information:
This work was partly supported by Japanese Gov-emment Grant-in-Aid No. 06453024 to SH. UG expresses appreciation for financial support from Monbusho (Ministry of Education, Science, Sports and Culture, Government of Japan).
PY - 1996/7/19
Y1 - 1996/7/19
N2 - The fluorescence lifetime, Tf, of 9-cyanoanthracene (9CNA) in the supercritical fluid (SF) of Xe (6.8 MPa at 293 K) is found to be 2.39 ± 0.13 ns, which is much shorter than the 17.78 ± 0.43 ns measured in SF of CO2. This large decrease in Tf is interpreted in terms of the vibronic-level-dependent heavy atom effect which is revealed by a comparison of the absorption and fluorescence excitation spectra measured for the 1:1 van der Waals complex of 9CNA with Xe generated in a supersonic jet. The effect of the temperature on Tf observed in Xe is concordant with the vibronic-level-dependent heavy atom effect.
AB - The fluorescence lifetime, Tf, of 9-cyanoanthracene (9CNA) in the supercritical fluid (SF) of Xe (6.8 MPa at 293 K) is found to be 2.39 ± 0.13 ns, which is much shorter than the 17.78 ± 0.43 ns measured in SF of CO2. This large decrease in Tf is interpreted in terms of the vibronic-level-dependent heavy atom effect which is revealed by a comparison of the absorption and fluorescence excitation spectra measured for the 1:1 van der Waals complex of 9CNA with Xe generated in a supersonic jet. The effect of the temperature on Tf observed in Xe is concordant with the vibronic-level-dependent heavy atom effect.
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U2 - 10.1016/0009-2614(96)00519-2
DO - 10.1016/0009-2614(96)00519-2
M3 - Article
AN - SCOPUS:0030593403
SN - 0009-2614
VL - 257
SP - 175
EP - 180
JO - Chemical Physics Letters
JF - Chemical Physics Letters
IS - 1-2
ER -