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1.
合成了两种新的二芳基乙烯类光致变色化合物1,2 双(2 甲基5 (4 乙氧基苯基)噻吩3 基)全氟环戊烯(1a)和1,2 双(2 甲基5 (对氟苯基)噻吩3 基)全氟环戊烯(2a),并且研究了其在不同溶剂和浓度中的UV Vis光谱、荧光性质和光致变色反应动力学特征.实验结果表明,化合物1a和2a具有良好的光致变色性质和较强的荧光;光致变色闭环反应为零级反应,开环反应为一级反应. 相似文献
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具有光致变色和发光性能的有机化合物的合成及其性能研究 总被引:8,自引:0,他引:8
以吲哚啉螺苯并吡喃与香豆素衍生物为原料,用DcC缩合酯化法在温和条件下合成了8种新的具有光致变色和发光性能的化合物,确定了结构,研究了紫外光谱、荧光光谱及光致变色性.所得化合物同时具有光致变色和发荧光的双重特性,而且荧光光谱中有两个激发波长,每一个波长对应产生一个不同的荧光发射峰. 相似文献
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L. K. Karabaeva I. A. Platonova I. V. Zavarzin S. I. Luiksaar V. N. Yarovenko B. V. Nabatov M. M. Krayushkin V. A. Barachevski 《Chemistry of Heterocyclic Compounds》2011,47(2):229-236
The precursors and hybrid compounds, including photochromic fulgimides and fluorescent benzothiazolylthienothiophene units,
have been synthesized. Spectroscopic investigations by absorption and fluorescence methods showed that fulgimide hybrids display
photochromism, but do not display fluorescence properties. A possible explanation for this fact is proposed and also the decreased
effectiveness of photochromic conversion. 相似文献
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Two novel isomeric photochromic diarylethenes with an indene bridging unit have been prepared by a simple and efficient one‐step synthesis method. Their properties, including photochromic behavior, fluorescent properties and fatigue resistance, have been investigated. These two isomeric compounds showed photochromic back‐and‐forth reactions with ultraviolet and visible light both in solution and in PMMA film. Their ring‐open forms exhibited appreciable fluorescence, which was quenched by the ring‐closed forms. All results indicated that diarylethenes derivatives with indene‐aryl bridges exhibited rather high fatigue resistance and good thermally irreversible photochromic properties. 相似文献
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Two new organic photochromic compounds based on pyrazolone were synthesized and further characterized by elemental analysis,
MS, IR spectra, and 1H NMR spectra. The photochromic properties and photochemical kinetics of them have been studied by UV absorption spectra under
irradiation of 365 nm light. The photochromism of pyrazolone derivatives in the solid state has been so far explained only
in terms of the light-induced change of absorption and their crystal structures, which is caused by the shift of the tautomeric
equilibrium between the enol and keto forms. In this work, their IR spectra have been measured before and after irradiation.
Based on the IR spectra and crystal structure analysis, a reasonable mechanism was proposed, the photochromic phenomenon may
be due to the photoisomerization from enol-form to keto-form through proton transfer. 相似文献
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Two new isomeric photochromic diarylethenes with a pyrrole unit have been developed. Their properties, including photochromic behavior, crystal structures, and fluorescent properties, have been investigated. The two isomeric compounds show distinctly different photochromism, both in solution and in the single-crystalline phase: one turns red upon photocyclization whereas the other turns blue, which may be attributed to the different substituent effects. 相似文献
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The photochromic spiropyrans and spirooxazine having a succinimidyl ester or isothiocyanate pendant group can form covalent products with transaminated DNA.The absorption spectra and solid reflection spectra of modified DNA with these photochromic spiro compounds were investigated. 相似文献
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Jacquart A Williams RM Brouwer AM Ishow E 《Chemistry (Weinheim an der Bergstrasse, Germany)》2012,18(12):3706-3720
Bifunctional molecules that combine independent push-pull fluorophores and azo photochromes have been synthesized to create fluorescent structures upon light-induced migration in neat thin films. Their photochromic and emissive properties have been systematically investigated and interpreted in light of those of the corresponding model compounds. Fluorescence lifetimes and photoisomerization and fluorescence quantum yields have been determined in toluene solution. Kinetic analyses of the femtosecond transient absorption spectra reveal that the fluorophores evolve in a few picoseconds into a distorted intramolecular charge-transfer excited state, strongly stabilized in energy. Radiative relaxation to the ground state occurred competitively with the energy-transfer process to the azo moiety. Introduction of a 10??-long rigid and nonconjugated bridge between the photoactive units efficiently inhibits the energy transfer while it imparts enhanced free volume, which favors photoactivated molecular migration in the solid state. 相似文献
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Photochromic properties and reaction mechanism of naphthopyran 总被引:1,自引:0,他引:1
The photochromic properties and reaction mechanism of title compounds have been examined with steady method on compounds 3-phenyl-3-[3-methylbenzothiophene-2-yl]-3H-naphtho[2,1-b]pyran (1) and 3-phenyl-3-[benzofuran-2-yl]-3H-naphtho[2,1-b]pyran (2) and nanosecond laser flash photolysis techniques on compound 3-phenyl-3-[1,2-dimethylindol-3-yl]-3H-naphtho[2,1-b]pyran (3). The influence of oxygen on transient spectra and decay kinetics of compound 3 has been investigated. Both excited singlet state and triplet state are involved in the photochromic mechanism of compound 3. The influence of molecular structure on photochromic behavior has been studied also. Decay kinetics indicated that the lifetime of colored forms of 1 and 2 were several orders of magnitude longer than that of 3. 相似文献
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研究9种带有芳香稠环或杂环基团的光致变色螺吡喃化合物的光致变色性能和荧光性质.通过紫外-可见吸收光谱和荧光光谱对该类化合物与DNA相互作用性能进行了初步探讨. 相似文献
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SHEN Kai-hua HAN Jian-guo ZHANG Gang CHOI Dong-hoon 《高等学校化学研究》2006,22(4):505-509
IntroductionSince the last decade, a large number of workshave concentrated on the photochromic behavior of in-dolinospirobenzopyran dyes[1—4]. Interest in these com-pounds has been concerned with the reversibility of thetransformation between the colorl… 相似文献
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Tunable Photochromism in the Robust Dithienylethene‐Containing Phospholes: Design,Synthesis, Characterization,Electrochemistry, Photophysics,and Photochromic Studies 下载免费PDF全文
Dr. Jacky Chi‐Hung Chan Dr. Hok‐Lai Wong Prof. Dr. Wing‐Tak Wong Prof. Dr. Vivian Wing‐Wah Yam 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(18):6936-6948
A series of dithienylethene‐containing phosphole derivatives has been designed, synthesized and characterized. One of the compounds has been characterized by X‐ray crystallography. Upon photoexcitation, the compounds exhibit drastic color changes, ascribed to the reversible photochromic behavior. Their photochromic, photophysical and electrochemical properties have been studied. They show photochromic reactivities with high photocyclization quantum yields. Their photophysical and photochromic properties are found to be facilely tuned in this system by substitution at the phosphole backbone, as well as variation on the extent of π‐conjugation of the phosphole backbone. Some selected compounds have been demonstrated to exhibit photochromic properties in polymethylmethacrylate (PMMA) films. 相似文献
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The oxidation of 1,1,3-tricyano-2-amino-1-propene in the presence of hydrogen peroxide and copper is favored by imidazole, 4-methylimidazole, or any other compound possessing the imidazole ring. This fluorescent reaction has been used for the individual determination of imidazole and 4-methylimidazole at 10−5M level by application of several kinetic methods (tangent, fixed-time, and maximum fluorescence intensity) with a precision (%RSD) of about ±1%. A differential-rate principle allows the determination of binary mixtures of both compounds, which is subject to synergistic effects. Mixtures of imidazole and 4-methylimidazole in ratios between 1:1 and 1:9 have been resolved with a %RSD of ±7.1% for imidazole and ±3.1% for 4-methylimidazole. 相似文献