BOSCHIBAs as a fluorescent dye of silk fibroin and their dual stimuli-responsive: Ultrasound synthesis, Photophysical Characterization, X-ray Analysis, and Molecular Docking

Abstract

In this study, a short series of Boron Schiff bases (BOSCHIBAs) were synthesized via ultrasound irradiation, significantly reducing synthesis time and making the process scalable for industrial applications. The whole compounds were characterized by NMR( 1 H, 13 C, 11 B), UV, IR spectroscopy, and mass spectrometry. X-ray diffraction analysis confirmed the formation of tetra-coordinated boron heterocycle compounds.Photophysical studies exhibited the fluorescent properties of the BOSCHIBAs, showing quantum yields comparable to other similar compounds. Furthermore, the BOSCHIBAs effectively stained silk fibroin fibers, exhibiting clear fluorescence patterns. Finally, we report two stimuli -thermal and mechanical milling-applied to the boron complexes, and two others -manual rubbing and cryogenic temperature-applied to the dyed silk fiber.These stimuli-responsive behaviors suggest potential applications in both biological and textile industries.