Aggregation-induced emission enhancement (AIEE) of N,N′-Bis(Salicylidene)-p-Phenylenediamine Schiff base: Synthesis, photophysical properties and its DFT studies

Add time:08/29/2019    Source:sciencedirect.com

The Schiff base of N,N′-Bis(Salicylidene)-p-Phenylenediamine (BSP) has been synthesized and characterized. The molecular structure and spectroscopic properties of the compound were experimentally characterized by elemental analysis, 1H NMR, FT-IR, UV–Visible, fluorescent spectroscopic techniques, and computationally by the density functional theory (DFT) method. The appearance of photophysical properties can be ascribed to the efficiency of the excited-state intramolecular proton transfer (ESIPT) and the twisted intramolecular charge transfer (TICT) process. Their fluorescence emission performance in solution and aggregation state showed that the compound had obvious aggregation-induced emission enhancement (AIEE) characteristics, upon addition of water in acetonitrile (80:20, v/v) solution; the quantum yield (ΦF) is increased by 0.001–0.152. Furthermore, due to the good luminescent properties, high quantum yield and the large Stokes shifts, the compound was an ideal candidate for promising applications in metal ion sensing of Cu2+ ions.

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