| Stimulus responsive materials can change their appearance color or fluorescence color under external stimuli,which makes them widely used in optical switches,sensors and anti-counterfeiting materials.However,there are few reports on the synthesis of polyarylsubstituted 4H-pyran and their derivatives and their use as solid-state fluorescence sensors,which deserve further study.Based on this,4Hpyran as the core structure,a series of multi-substituted 4Hpyran/pyridine/isoquinoline derivatives were designed and synthesized in this paper,and their photophysical properties and applications in related fields were studied:(1).A variety of novel 4,5,6-triaryl-4Hpyran derivatives were designed and synthesized by introducing benzofuran,benzothiophene and benzene at the 6 positions of the pyran ring.It was found that the solid sample of the target compound showed high contrast,short response time,good fatigue resistance and reversible photochromic phenomenon under the irradiation of UVwhite light;(2).Starting from 2-amino-4,5,6-triaryl-4H-pyran derivatives,a variety of 2,3,4,6-tetraaryl-4H-pyran derivatives were designed and synthesized by introducing benzene,triphenylamine and9-phenyl-9H-carbazole at the 6 sites of the pyran ring.It was found that the introduction of appropriate substituents could lead to significant mechanochromic activity of the derivatives;(3).Further,two 4,5,6-triaryl-substituted pyridine derivatives with benzofuran and benzothiophene groups on 6 sites were designed and synthesized from2-amino-4,5,6-triaryl-4H-pyran derivatives.It was found that the solid samples of the target compounds showed reversible acidchromic activity;(4).A series of multi-substituted isoquinoline derivatives with different alkyl chains were synthesized from 4H-pyrans which were easy to obtain.A class of host-guest doped materials were prepared by using dibenzophenone as the host molecule and dibenzophenone as the host molecule.It was found that the materials had excellent room temperature phosphorescence at room temperature.Strong phosphorescence intensity makes the prompt emission of the doped material exhibit dual luminescence properties of fluorescence and phosphorescence.The length and concentration of the alkoxy chain of the guest molecule can be used to control the relative intensity of the double emission,thus regulating the color and phosphorescence intensity of the prompt emission. |
