Abstract
Abstract Photophysical studies of resorcinol based acridinedione (ADDR) dyes with a simple amino acid like glycine were carried out in water. Addition of glycine to photoinduced electron transfer (PET) based dye resulted in a fluorescence enhancement. Interestingly, addition of glycine to PET dye not only results in a fluorescence enhancement but a significant shift in the emission maximum towards the red region was observed. The fluorescence enhancement is attributed to the suppression of the PET process through space between the donor and the acceptor moiety of acridinedione dye ring structure. Both hydrogen-bonding along with hydrophobic interactions influences the excited state properties of ADDR dyes in the presence of glycine are elucidated by fluorescence spectral techniques. The existence of dye in two different environments is established from Time resolved fluorescence lifetime studies. The addition of glycine to non-PET dye does not influence the excited state properties clearly reveals that the PET process is influenced by the presence of glycine in water.
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