Article ID Journal Published Year Pages File Type
6598949 Dyes and Pigments 2018 37 Pages PDF
Abstract
The spectral properties of novel pyrene-piperidine/pyrene-piperidine-1-oxyl adducts with varying linkers differing in electronic conjugation between these two functionalities were investigated in solvents of different polarity. Tuning their fluorescence efficiency via structure modification is discussed in terms of increased conjugation, solvent polarity effect, main non-radiative de-excitation pathways and static/dynamic excimer or solute-solvent exciplex fluorescence. Compared to parent pyrene molecule, the main additional non-radiative de-excitation pathways leading to significant fluorescence quenching were studied using time-resolved fluorescence spectroscopy and quantum-chemical DFT (Density Functional Theory) calculations and were identified as reductive photo-induced electron transfer and intramolecular paramagnetic quenching.
Related Topics
Physical Sciences and Engineering Chemical Engineering Chemical Engineering (General)
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