理論設計俘精酸酐和二芳基乙烯類光致異構化分子開關
[Abstract]:In recent years, with the rapid development of science and technology and the deep exploration of the field of photochemistry, the organic photochromic compounds have rapidly become active research fields. Among them, the most common organic photo-isomerizing molecules include, for example, the alicyclic type, the diarylethylene group, the azobenzene group, and the snail-like type, and the like. As a typical photoisomerization molecule, the fine acid and the diaryl ethylene have wide application and development prospect in the fields of molecular switches, optical information storage, and the like because of the characteristics of good fatigue resistance, thermodynamic stability and rapid response. They mainly have two isomers, namely an open-loop body and a closed-loop body, which can be mutually transformed between the two isomers under the irradiation of an appropriate absorption wavelength. Based on this structural characteristics, they are often used as an important component of the molecular switch. Therefore, the study of the organic photochromic compound has very important theoretical and practical significance. In this paper, the ground state geometry and the properties of the low-excited state are discussed in this paper by using the density functional theory (DFT) and the time-time density functional theory (TDDFT) method. In this paper, the research of the derivatives of the diarylvinyl derivatives is mainly focused on the discussion of the absorption property and the design of the multi-functional molecular switch, and the research of the diaryl ethylene derivatives is mainly focused on the discussion of the nonlinear optical properties. The main contents are as follows:1. The effect of the different substituents on the spectral properties of the captives and the molecular design of a series of novel trimer-substituted captive protamine dimers has been studied by the theoretical study of the molecular design of a series of novel and substituted captives (closed-loop and open-loop) with a short absorption wavelength to limit their real-time. Inter-application, especially in many semiconductor devices. Therefore, we have discussed the influence of different substituents on the geometric and spectroscopic properties of the captives substituted by the different substituents by means of the density functional theory. It was found that in the R3 position, the introduction of amino (NH2) gave a clear wavelength red shift on the closed-loop body surface of the captured acid solution, and its closed-loop body and the open-loop body exhibited a large wavelength difference. Thus, this molecule has the desire to be a candidate for a multi-function molecular switch. On the basis of this work we further designed nine bis-furylfurbiide dimers (BFF:1-9) and discussed the separation of their absorption spectra. Among them, the antisymmetric BFF-6 dimer shows the greatest photoisomerization potential. Therefore, we have discussed its photoisomerization mechanism in detail from the theoretical point of view. In this paper, the second order nonlinear optical properties of a series of B (C6F5)2-coordinated diatomic ethylene derivatives have been studied in this paper. We have calculated the static first hyperpolarizability of a series of experimentally synthesized B (C6F5)2-coordinated diatomic-based ethylene derivatives, we found that, 2-B (C6F5)2 molecules show good nonlinear optical response. On the basis of this molecule, we introduced a simple N = N-ph ligand and considered the effect of the substituents on the nonlinear optical behavior of the electron and electron-absorbing capacity of the substituent. The results show that the introduction of the ligands significantly improves the non-linear optical properties of the molecules, and, with the increase of the electron and electron-absorption capacity of the substituents, the ttot values of the open-loop body and the closed-loop body are significantly improved. In which the ttot value of the closed-loop body is higher than the corresponding open-loop body, which is due to the formation of a larger ring resonator structure in the closed-loop process. In addition, in the five-group molecule that we design, the closed-loop body 5c exhibits the largest Bot value (7361.4-10-30 esu), which is 29.8 times the corresponding open-loop body 5o. In addition, we used the time-density functional theory to analyze their absorption spectra and the properties of the front-line molecular orbital. Finally, we have discussed the effect of the dispersion effect on the dynamic first-order hyperpolarizability (Bot) in the range of the frequency range of 0 = 0.000-0.065 a. u. We hope that the current theoretical work can help the design of nonlinear optical materials for later theory or experiment.
【學位授予單位】:吉林大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:O621.22
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