A Sensitive Concentration- and Polarity-Dependent Pyrene-Derived Vibrationally Resolved Fluorescence Probe for The Polymer Interdiffusion Study

The vibrationally resolved pyrene fluorescence probe method is once popular but now languished, because the vibrationally resolved patterns of pyrene with limited sensitivity and concentration independence have not been updated for over 50 years. During investigation on the polymer interdiffusion of a latex film, it is found that a pyrene acylhydrazone whose vibrationally resolved fluorescence pattern contradictory to those reported in pyrene and most pyrene derivatives. The pyrene acylhydrazone has sensitive concentration- and polarity-dependent fluorescence spectra (the sensitivity on polarity is at most 26 times higher than the old vibrationally resolved patterns), and the sensitivity well remains when it is copolymerized in a polymer. The vibrationally resolved spectrum of this pyrene acylhydrazone is a powerful fluorescence probe, which would be as useful as the pyrene excimer probe nowadays popular. A vibrationally resolved pyrene acylhydrazone fluoscence probe with concentration- and polarity-dependent feature, and its application in probing polymer interdiffusion in latex films.image

Automated summary

The vibrationally resolved pyrene fluorescence probe method has become less popular due to limited sensitivity and concentration independence. However, the recent discovery of a pyrene acylhydrazone with concentration- and polarity-dependent fluorescence spectra has provided a powerful vibrationally resolved spectrum probe.