Connors, Robert E.
The effects of different substituent groups as well as protonation on 2,5-dibenzylidene-cyclopentanone and 2,5-bis-(3-phenyl-allylidene)-cyclopentanone spectral properties were investigated. In general, a red shift was observed when moving from hydrogen bonding to acidic media due to protonation and polarity of the molecules. The electron donating substituents promoted fluorescence and decreased the difference in wave numbers between the first and second excited states in both protonated and unprotonated forms. The electron-withdrawing group significantly decreased this difference only in the unprotonated form.
Worcester Polytechnic Institute
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Chemistry and Biochemistry