Novel isoindigo-based conjugated polyelectrolytes: Synthesis and fluorescence quenching behavior with water-soluble poly(p -phenylenevinylene)s

Abstract

Two novel ID-based water-soluble conjugated polymers (1)-PIDPV and (2)-PIDPV were synthesized by Heck coupling reaction. These two polyelectrolytes are both consisted of isoindigo units and phenylenevinylene units. In the UV-vis absorption spectra, both (1)-PIDPV and (2)-PIDPV exhibit broad absorption bands that almost cover the whole visible region. Photophysical investigations reveal that the fluorescence of water-soluble PPV can be efficiently quenched by oppositely charged PIDPV at a very low concentration. Cationic PPV shows an efficient quenching effect with K SV 5 1.01 3 10 6 M 21 in the presence of (2)-PIDPV while the anionic PPV gives a lager quenching constant with K SV 5 1.71 3 10 6 M 21 in the presence of (1)-PIDPV. Furthermore, the blend films of watersoluble PPVs and oppositely charged PIDPV also exhibit excellent quenching effect. These properties suggest that (1)-PIDPV and (2)-PIDPV are promising materials in the application of ionic photoactive layer in the organic solar cells.

Tailoring the Phase Transition and Luminescence Behaviors of a Poly(ionic liquid) to Ensure Visual Temperature Sensing

“…In the phase transition temperature range, the chains of PIL change from irregular loose linear shapes to compact aggregated spherical morphologies . The aggregation behavior of PIL will increase the self-association and exciton migration within and between the chains to produce an amplified quenching effect, so the fluorescence intensity decreases more sharply. − The enhanced fluorescence quenching caused by polymer aggregation is further reflected in the relationship between the fluorescence lifetime and temperature (Figure S17). In the phase transition temperature range of PIL, the fluorescence lifetime decreases dramatically.…”