極端酸堿和剪切力誘導(dǎo)變色分子的合成及機(jī)理研究
[Abstract]:Environmental sensitive materials have always been a hot topic in the field of materials. Environmental sensitivity is widely used in the fields of information and energy storage because it can produce specific and controllable changes with the environment. Common environmental sensitive types are acid and alkali, light, heat and force. Among them, acid-base sensitivity and mechanical sensitivity are two types discussed in this paper. Although acid-base sensitive materials have been developed for a long time, there are few reports on the polar acid-base sensitive materials, especially on a fluorescent group. The mechanical sensitive material, that is, the pressure sensitive material, has been paid more attention in recent years, but because of the short development time, it still needs the related research and exploration. In the second chapter, the discolored spiropyran probe, which is stimulated by polar acid and alkaloids, is different from the previously reported spiropyran probe, and only under the stimulation of polar acid can it open a ring to induce color change. And in the range of polar alkali, it can ionize to induce a very obvious red shift color change. In order to verify the mechanism, we have synthesized a total of 4 spiropyran probes similar to substituents. Firstly, two spiropyran probes were designed and synthesized by studying the acidic mechanism. The two spiropyran probes were designed and synthesized, respectively, which removed the electron-absorbing group carboxyl group from an indole-ring and the N-site large steric resistance group benzene carboxyl group. Then we have also designed two structures in the basic region, one is to remove three acidic functional groups and the other is to remove one phenolic hydroxyl from the spiropyran probe. We compared the spectra with the nuclear magnetic field. Finally, we used the probe to label bacteria under different pH conditions. The probe not only entered the cells, but also got the same response effect as the solution. In the third chapter, we discuss the mechanochromic behavior induced by supramolecular system with chemically weakly bonded fluorescent small molecules. This chapter is the first to suggest that cyclodextrin can induce some small molecules to discolor more easily. We first synthesized two small molecules, Rhodamine Rh and spiropyran SP., which have weak chemical bonds. Then the two small molecules were coated with cyclodextrin, and the successful synthesis of the inclusion compounds was verified by correlation characterization. Then, the mechanical chromotropic properties of small molecule and inclusion system were compared, and the related mechanism was explored and analyzed by simulation and experimental characterization. We find that hydrogen bonds play an important role in this system, and hydrogen bonds play an important role in these two aspects: first, the hydrogen bonds hold the two ends of the weak bonds of the dyes and firmly hold the dye molecules in cyclodextrin. The hydrogen bond promotes the aggregation of the inclusion compounds into a regular structure and strengthens the interaction between molecules. In this way, the weak chemical bonds of dye molecules can concentrate more external forces, thus making it easier to force discoloration. This method provides a good way for the combination of force chromotropic and supramolecular systems.
【學(xué)位授予單位】:北京化工大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類(lèi)號(hào)】:TB34
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