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Title: Photophysics of 3-hydroxyflavone in supercritical CO2: a probe to study the microenvironment of SCF
Authors: Chattopadhyay, Nitin 
Barroso, Mónica 
Serpa, Carlos 
Isilda Silva, M. 
Arnaut, Luís G. 
Formosinho, Sebastião J. 
Issue Date: 2004
Citation: Chemical Physics Letters. 387:4-6 (2004) 263-266
Abstract: The excitation of 3-hydroxyflavone (3HF) to its second excited singlet state (S2) gives rise to dual fluorescence in supercritical carbon dioxide. The ultraviolet fluorescence originated from the S2 state of 3HF is well separated from the green emission emanating from the tautomeric form, produced via the excited state intramolecular proton transfer. The relative intensity of the S2 to the tautomer fluorescence (S2/T) has been studied as a function of pressure and temperature. It is shown that this ratio reflects the microheterogeneity of the supercritical CO2, and confirms the value of fluorometric probes in disclosing the microscopic properties of supercritical fluids.
Rights: openAccess
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais

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