Polychromatic Regulation of Nonconventional Luminescent Polyurethane Derivatives by Bonding Mode

Abstract

The development of panchromatic fluorescent polymers has an essential scientific and practical significance. In this work, a series of nonconjugated polyurethane derivatives (PUs) with full-color emission are easily obtained through facile one-pot reactions. Diol monomers with different linking modes were selected for introducing single-, double-, or triple-bond repeating units into the main chain of the PUs. The electronic structure of the PUs was investigated by using density functional theory. The results suggest that the final aggregate structure of the material and the interactions within the system rather than its inherent electronic structure play a decisive role in launching its emissive behavior. Detailed photophysical and microscopic morphology characterizations elucidate the intricate aggregated photophysical behavior of the PUs. Thanks to the long wavelength absorption and emission of PUT-H, low toxicity, and good biocompatibility properties, water-soluble PUT-H NPs have been successfully applied for the photothermal ablation of thrombosis in vitro. This work provides a general protocol for the simple preparation of polymer-based biologics while also deepening the understanding of the mechanism of aggregated-state luminescence in nonconventional fluorescent polymers.