常见有机光致变色体系的研究现状

介绍了常见的有机光致变色材料体系,光致变色材料在染料、民用品等方面的应用,开发有机光致变色材料作为记录介质的光盘,已成为高技术领域的一项重大课题。综述了光致变色材料在国际和国内的研究现状。光致变色材料是当前高科技领域重要的研究课题,光致变色材料在光信息存储的高科技领域、在防伪材料、装饰材料、具有广阔的应用价值和发展前景。     

含S，N杂环戊烯桥头的二芳烯光致变色化合物的合成及性质研究

光致变色材料是目前光功能材料领域中研究的热点之一．在众多的光致变色体系中，二芳烯化合物因其良好的热稳定性和抗疲劳性使其在信息光存储及分子光开关等领域有着广泛的应用前景．发展新型二芳烯光致变色分子体系和相关的合成路线以及探索新型二芳烯分子结构与光致变色性质的关系是一个很有吸引力的课题．该论文以发展新型二芳烯光致变色化合物为目标，对分子的设计合成及光致变色性质进行了深入的研究，并对二芳烯化合物在光信息存储和化学传感器方面的应用进行了探索．取得了一些有意义的研究成果：     

无机光致变色材料研究进展

无机光致变色材料具有许多优于有机光致变色材料的优良特性,进而广泛地应用在信息存储、智能窗、太阳镜、传感器、智能开关、国防等诸多领域。笔者综述了无机光致变色材料的研究、发展进程,并对无机光致变色材料的发展趋势进行了展望。     

光致变色材料研究进展

文章从光致变色发展历程、光致变色定义、光致变色体系、光致变色机理及光致变色应用等方面对光致变色材料进行了综述。随着科学技术的不断发展,有机光致变色材料必将在未来的日常生活和国防建设中发挥越来越重要的作用。     

重要文章导读

以1,4-二碘丁烷为中间体双螺环螺恶嗪的合成与表征原文节录:光致变色材料是一种新型的功能材料。这类材料的分子中含有光致变色基团,具有颜色变化的可逆性、耐疲劳度高、分辨率好、信息存储量大、反应速度快等特点,在光信息存储、光开关、光转换器件等高科技领域有着广阔的应用前景。由于光致变色材料具有优异的性能和高科技领域中广泛的应用前景,已引起国内外科技界的重视,我国已经把光致变色材料的研究列入“863”高科技计划。     

光致变色材料的制备、性能及变色机理

光致变色材料可广泛应用于光信息存储、民用生活、防伪、军事等不同领域,引起人们越来越多的关注。本文主要综述了有机类(含螺吡喃、螺噁嗪、偶氮苯、二芳基乙烯、俘精酸酐、席夫碱)、无机类(含多金属氧酸盐、过渡金属氧化物、金属卤化物)以及有机-无机复合类光致变色材料的制备、性能、变色机理和研究进展,同时,简单介绍了光致变色材料的应用,最后对其研究发展做出展望。     

键合光致变色螺噁嗪侧基的聚合物研究进展

综述了键合螺噁嗪侧基聚合物的研究进展。由于螺噁嗪类化合物的光致变色性质在光信息存储材料等领域有巨大的应用前景,特别关注了各种聚合物体系对螺噁嗪衍生物光致变色行为的影响。     

重要文章导读——以1，4-二碘丁烷为中间体双螺环螺恶嗪的合成与表征

原节录：光致变色材料是一种新型的功能材料。这类材料的分子中含有光致变色基团，具有颜色变化的可逆性、耐疲劳度高、分辨率好、信息存储量大、反应速度快等特点，在光信息存储、光开关、光转换器件等高科技领域有着广阔的诮用前景。由于光致变色材料具有优异的性能和高科技领域中广泛的应用前景，已引起国内外科技界的重视，我国已经把光致变色材料的研究列入“863”高科技计划。     

双光子诱导有机光致变色材料的研究进展

在介绍舣光子诱导有机光致变色材料性能的基础上,重点介绍双光子诱导光致变色材料种类、光致变色原理及在三维信息存储、生物技术研究和荧光共振能量转移方面的应用.最后对双光子诱导有机光致变色材料的研究趋势做了展望.     

二芳乙烯荧光开关材料及其应用进展

二芳乙烯作为经典的光致变色体系,因本身具有热稳定性好、抗疲劳性强、响应时间快、量子产率高等优点,越来越受到研究者的重视。本文综述了近几年来作者课题组在光开关二芳乙烯化合物研究方面的一些进展,主要涉及二芳乙烯荧光开关材料在非破坏性读出、生物成像等方面的应用研究。     

刚性与柔性连接的骨架型二芳烯聚合物

以二芳基乙烯(二芳烯)为共聚单体之一,通过便捷的合成步骤,合成了两个骨架型二芳烯类聚合物,研究了其溶解性、光致变色能力及抗疲劳性等性质。所得到的两个二芳烯聚合物均具有可逆的光致变色能力和优秀的抗疲劳性。在两个聚合物合成过程中,二芳烯与共聚单元的连接分别采用刚性和柔性两种连接方式,从而得到了具有不同分子量及光谱性质的二芳烯聚合物。     

Synthesis and photochromic properties of a multiple responsive diarylethene and its selective binding affinity for copper(II) ion

A multiple responsive photochromic diarylethene, 1-[2,5-dimethyl-3-thienyl]-2-[2-methyl-5-(2-pyridyl)-3-thienyl]perfluorocyclopentene (1) with excellent fatigue resistance has been successfully synthesized. Easy and reversible conversion is observed between the two open- and closed-ring isomers of 1 upon irradiation with UV and visible light. Addition of trifluoroacetic acid to these two isomers gives two new protonated products featuring distinctively different color changes. Photochromic diarylethene 1b is found to have selective interaction with copper(II) ion. With increasing amount of copper(II) ion, the absorption maximum of the photostationary state at 563 nm decreases and disappears eventually, and the color of the solution changes from purple to colorless. Upon UV light irradiation, the solution color remains colorless and can no longer be restored. UV–vis absorption spectroscopy, fluorescence, and NMR spectroscopy were used to investigate the selective interaction between diarylethene 1b and copper(II) ion with results indicating that diarylethene 1b exhibits selective binding affinity for copper(II) ion.     

Synthesis and photochromic properties of a multiple responsive diarylethene and its selective binding affinity for copper(II) ion

A multiple responsive photochromic diarylethene, 1-[2,5-dimethyl-3-thienyl]-2-[2-methyl-5-(2-pyridyl)-3-thienyl]perfluorocyclopentene (1) with excellent fatigue resistance has been successfully synthesized. Easy and reversible conversion is observed between the two open- and closed-ring isomers of 1 upon irradiation with UV and visible light. Addition of trifluoroacetic acid to these two isomers gives two new protonated products featuring distinctively different color changes. Photochromic diarylethene 1b is found to have selective interaction with copper(II) ion. With increasing amount of copper(II) ion, the absorption maximum of the photostationary state at 563 nm decreases and disappears eventually, and the color of the solution changes from purple to colorless. Upon UV light irradiation, the solution color remains colorless and can no longer be restored. UV-vis absorption spectroscopy, fluorescence, and NMR spectroscopy were used to investigate the selective interaction between diarylethene 1b and copper(II) ion with results indicating that diarylethene 1b exhibits selective binding affinity for copper(II) ion.     

光致变色二芳烯掩膜及在近场光存储中的应用

合成了在超分辨率近场结构（Super-RENS）存储方式中适合做掩膜层和记录层材料的两种全氟二芳烯，旋涂法制备了实验存储盘片，并进行了近场存储实验．初步的实验表明，光致变色二芳烯掩膜层可以缩小聚焦激光的直径，得到小尺寸记录信息．掩膜层中二芳烯的浓度，对近场存储结果影响很大，存在一个最佳浓度使记录光斑的尺寸减少到最小．     

Facile preparation of gold nanoparticle with diarylethene polymers by disodium malate and its photoreversible optical properties

We have developed a synthetic procedure of gold nanoparticle covered with polystyrene (Au-poly(St)) using organic acid salts, followed by a ligand exchange reaction. First, various chain lengths of polystyrenes (poly(St)s) bearing thiol-end group were used as the covering agent of gold nanoparticle prepared by reduction using trisodium citrate. The resulting nanoparticles with ca. 13 nm diameter were dispersed in toluene when the molecular weight of the ligand poly(St) is larger than 1200. Larger sized Au-poly(St) could be obtained using disodium malate instead of the citrate. The colloidal gold nanoparticle with ca. 40 nm diameter was easily prepared only by changing the reducing agent. Finally, we have demonstrated to prepare larger sized gold nanoparticle covered with a photochromic diarylethene polymer (Au-poly(DE)) that shows large change in local surface plasmon resonance absorption according to the photochromic reaction even in a solution.     

Single molecule multiphotochromism with diarylethenes

In single photochromes, the two isomers that are interconverted in photoinduced reactions can serve as on and off states in a molecular switching device. The addition of several photochromic moieties onto a single molecule can allow the processing of more complex logical patterns. For example, an asymmetric triad could, in principle, store a byte, rather than a bit, of data. Because of the potential impact of multiphotochromic molecules in many research areas, over the past decade several groups have synthesized these coupled structures. The targets are easily addressable molecules that display increased contrast between the on and off states and in which all isomers have significantly distinguishable optical signatures. In this Account, we provide an overview of the multiswitchable molecular systems that incorporate at least one diarylethene group, which is the most successful thermally stable (P-type) organic photochrome. Up to this point, most systems have presented significant limitations. First of all, the reversibility of the processes is hindered by several side reactions more frequently than for single photochromes. Second, switching one part of the compound impedes the photoreactivity of other fragments in approximately 50% of the cases, and maximizing the electronic communication increases the probability of partial activity. In addition, most of the few synthesized operative systems only demonstrate cumulative absorption spectra rather than new features. Finally, it is impossible to selectively induce a chosen conversion because one wavelength might trigger several processes. We also emphasize the promising successes of asymmetric diarylethene dimers and trimers and molecules that combine two families of photochromes, such as diarylethene added to fulgimide or phenoxy-naphthacenequinone. In that framework, theoretical simulations offer complementary tools to investigate these structures, both to obtain structure/property relationships and to propose paths for the design of more efficient molecules. However, due to the size of the systems, researchers can only apply semiquantitative models. The investigation of the absorption spectra of the photochromes with time-dependent density functional theory (TD-DFT), the analysis of the topology of the LUMO + n (typically n = 1) of the closed-open hybrid, and an estimate of the steric stress in the hypothetical (ground-state) closed-closed structure serve as a useful combination of parameters to obtain initial insights regarding the photocyclization of the different open diarylethene groups. Nevertheless, because a first-order qualitative approach does not explore the potential energy surface of the photoexcited states, it remains inadequate for the investigation of some molecules.     

Photochromic Diarylethene Derivatives Bearing Hydrophilic Substituents

Photochromic diarylethene derivatives bearing hydrophilic N,N-bis(2-(2-(2-methoxyethoxy)ethoxy)ethyl)sulfonamide (SO₂NTEG₂) ( 1 – 3 ) or myo-inositol ( 4 – 6 ) substituents were synthesized. Although the solubility in aqueous solution of the derivatives containing the four tri(ethylene glycol) chains was relatively poor, the solubility was improved by introducing two myo-inositol residues. The derivatives could be dissolved even in pure water and underwent photochromism upon alternate irradiation with ultraviolet (UV) and visible light, in both organic and aqueous solutions. The absorption maxima of the open- and closed-ring isomers of these derivatives and the photostationary conversion ratios from the open- to the closed-ring isomers upon UV irradiation did not change much, even when the solvent polarity was changed. These results indicate that the diarylethene derivatives are mono-molecularly dissolved in aqueous solution and that intermolecular interactions between the derivatives are negligible when the concentration is less than 1×10⁻⁴ mol⋅L⁻¹.     

The synthesis of novel photochromic diarylethenes bearing a biphenyl moiety and the effects of substitution on their properties

A new class of diarylethene bearing a biphenyl moiety was synthesized and the effects of substitution on photochromism, fluorescence and electrochemical character, were investigated. Under alternating irradiation with UV and visible light, the compounds exhibited good photochromism and functioned as fluorescent photoswitches both in solution and in PMMA film. Electron-donating substituents shifted the λ_max of the diarylethenes to longer wavelengths and decreased their cyclization quantum yield, while electron-withdrawing substituents greatly increased both cyclization and cycloreversion quantum yield. In addition, cyclic voltammetry revealed that the substituents had a significant effect on the electrochemical behaviour of the diarylethene derivatives.     

全氟环戊二芳基乙烯多功能分子开关的研究进展

全氟环戊二芳基乙烯是近年来国内外备受关注的一类光致变色化合物.其优良的热稳定性、抗疲劳性,使其很有可能成为一种新型的超高密度信息存储、分子开关及光通信材料.主要介绍了该类化合物的结构异构所表现的不同特性的光/热控分子开关、电化学开关、荧光开关、手性开关和液晶等分子开关,并展望了该类化合物的发展前景.     

9＇-取代吲哚啉螺噁嗪衍生物的合成与光谱性质

将2个9’－羟基吲哚啉螺萘并噁嗪衍生物（Ia、Ib）,进一步以N,N’－二环己基碳二酰亚胺为脱水剂、4－二甲氨基吡啶为催化剂合成了2个9’－丙烯酰氧基吲哚啉螺萘并噁嗪衍生物（IIIa,IIIb）和2个9’－（α－呋喃丙烯酰氧基）吲哚啉螺萘并噁嗪衍生物（Va,Vb）。通过元素分析、^1HNMR和IR对产物的结构进行了表征。将化合物Ⅲa的乙醇溶液浸渍在脱脂棉上,经太阳光照射由无色变为蓝色;当脱脂棉移至阴暗处后,蓝色慢慢变淡消失。光致变色过程循环50次无异常发生,显示出良好的光致变色性能。