Synthesis and properties of fluorescent coumarin/perylene-3,4,9,10-tetracarboxylic diimide hybrid as cold dye

Abstract

Perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) was modified by ethylenediamine to obtain perylene-3,4,9,10-tetracarboxylic diimide (PTCDI). PTCDI as an initial core was used to bond coumarin derivatives. Successful conjugating of coumarin derivatives onto PTCDI was confirmed by Fourier-transform infrared spectroscopy (FT-IR), proton nuclear magnetic resonance (1H NMR), X-ray diffraction (XRD), and field emission scanning electron microscope (FE-SEM). XRD peaks of various samples showed that the crystalline structure of PTCDA retained during the modification processes. The morphology of the nanoparticles by FE-SEM showed that the dyes were fibrillar. Fluorescence microscopy was used to evaluate the fluorescence properties of the dyes. In order to determine the amount of absorption and reflection in the near-infrared region, NIR test was used in both white and black fields. High absorption on a white background and high reflection on a black background indicated the transparency of the dye in the near-infrared region. The synthesized dye was identified and reported as a cold dye.