Photophysical properties of a D-π-A Schiff base and its applications in the detection of metal ions

Dalton Transactions : an International Journal of Inorganic Chemistry
Yang KangLin-Pei Jin

Abstract

A D-π-A Schiff-base compound, 2-amino-3({[4-(diethylamino)-2-hydroxylphenyl]methylene}amino)-but-2-enedinitrile (H2L), was prepared using diaminomaleonitrile and 4-(N,N-diethylamino)salicylaldehyde. Compared with H2L at 293 K, a low temperature of 100 K makes the parallel aromatics in H2L come closer and fluorescence emission becomes weaker because of π-π interaction-caused quenching. After grinding the crystals of H2L, the colour changed from dark brown-red to yellow under room light and the fluorescence emission enhanced about 9-fold due to the damage of the intermolecular hydrogen bonds, leading to a decrease of non-radiative transition. H2L showed aggregation-induced emission enhancement (AIEE) characteristics in THF/H2O, whose mechanism is attributed to the restriction of intramolecular rotation (RIR). The UV-Vis spectra of H2L with Cu2+ in THF/H2O showed that at first a CuL complex was formed and subsequently a CuL' complex (H2L' = N',N'-bis(4-N',N'-diethylsalicylidene) ethylenediamine) was obtained. The CuL complex turned into the CuL' complex as time prolonged. H2L acted as a dual channel chemosensor for Cu2+ ions in THF/HEPES (v/v: 2 : 8, pH = 8.0) and the CuL complex was stable in this medium. H2L is also a naked-eye ...Continue Reading

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Citations

Dec 19, 2020·Comprehensive Reviews in Food Science and Food Safety·Xiaolin HuangBen Zhong Tang
Feb 13, 2021·Luminescence : the Journal of Biological and Chemical Luminescence·Meng GaoChung-Der Hsiao
Feb 22, 2021·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Kumar KrishnaveniAlagarsamy Mathavan

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Methods Mentioned

BETA
X-ray
scanning
dynamic light scattering
Fluorescence
fluorescence microscopy
and
fluorescence spectrometry

Software Mentioned

Gaussian
Olex2

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