1,3]噁嗪类化合物的设计合成及其在不同溶剂与温度下的性质研究

1,3]oxazine derivatives A, B and C were designed and synthesized, and their UV-Vis spectra in different solvents were measured to study their response behavior in solvents of different polarities. The results showed that oxazine compound A molecule was prone to isomerization reaction, changing from a closed-loop state to an open-loop state, and the compound solution was accompanied by obvious color changes. In addition, oxazine compound A molecule exhibited a reversible temperature response, and when the temperature rises, the molecular structure changes from an open-loop state to a closed-loop state, and the color of the solution becomes lighter. When cooled to room temperature, the color of the solution returns to the color before heating, and changes from an open-loop state. In contrast, the difficulty of isomerization of oxazine compounds B and C molecules is increased, which is related to the different electronic groups in the molecular structure, and the color change of compound B and C solutions is significantly weaker than that of oxazine compound A solution at different pH and temperature. The thermochromic effect exhibited by oxazine compound A makes it promising in the field of temperature-stimulus-responsive materials, and this study shows that it has potential application value.