N. Kometani, J. Okamoto, K. Asami
Oct 25, 2002
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Journal
Journal of Physics: Condensed Matter
Abstract
The fluorescence spectra of 4-dimethylamino(benzonitrile) (DMABN) have been measured for a mixture of supercritical CO2 and methanol at high pressures up to 15.5 MPa at 318 K. It is found that the addition of a small amount of methanol can stabilize the intramolecular charge transfer (ICT) state of DMABN in the supercritical fluid mixture. The spectral shift of the ICT band has been analysed on the basis of Onsager reaction field theory; a significant increase of the local composition of methanol around the DMABN molecule in the ICT state is demonstrated.