No excited state proton transfer takes place in jet-cooled methanol clusters of 3-hydroxyflavone

Abstract

Recently, the excited state proton transfer has been reported in jet-cooled methanol complex of 3-hydroxyflavone (3-HF) by Dawes and Wallace. However, selective excitation of the methanol cluster bands longer than the origin band (356.12 nm) of bare 3-HF demonstrates that no excited state proton transfer takes place. The tautomer fluorescence in the methanol complexes observed by Dawes and Wallace seems attributable to the consequence of the excitation (354.7 nm) of the superimposed band of the bare molecule and methanol complex.