730985-76-9Relevant academic research and scientific papers
Light-driven coordination anions-directed regulation of chromism in three metal complexes assembled by cyano-equipped dithienylethene ligand
Han, Jia-cai,Han, Jing,Li, Qing,Liu, Xiang,Quan, Chun-yan,Yu, Zhong
, (2020/04/21)
Three coordination compounds were self-assembled successfully with Ag(I) ions and photo-responsive ligands featuring a cyano-equipped dithienylethene unit. Anions with different coordinating abilities were selected to construct distinct topologies, which are evidenced by X-ray crystallographic analysis. CF3 COO? and CF3 SO3? are involved into coordination in 1 and 3, respectively, whereas in 2 BF4? present merel y as ionic guests counterbalancing the framework charge. Anions also show their subtle effects on coordinated atoms, interactions, and ligand configurations. The quite different structures of 1–3 indicate an interesting anion-directed structural self-assembly. Followed examinations on photochromism illustrated that the reversible photo-isomerizations of three complexes are all retained after complexzation with Ag(I) center. Various degrees of bathochromic shifts in absorptions were observed as compared with that of the metal-free ligand. Therefore, the photo-switching of these compounds could be modulated conveniently and finely by varying simply the coordination anions and then triggering by light irradiation. The discussions of structure-properties relationship concluded that anions exert their effects on coordination structure through adjusting the configurations of ligands in complexes. Strong coordinating anions facilitate a pronounced conformational change of ligand whereas un-coordinating anion leads to smaller variation. The distinct structural changes of ligand result finally the different perturbation of photochromic behavior.
Imidazole - the thiophen is fragrant heterocyclic ultra-short wavelength photochromic diaryl ethylene compound synthetic methods and application
-
, (2017/07/31)
The invention discloses a method for synthesizing an ultrashort-wavelength photochromic diarylethene compound by using imidazole-thiophene aromatic heterocycle and an application of the compound. A photochromic material can maintain good photochromic performance in a solution or film, has weaker fluorescence when the open-loop state ranges from 265 nm to 276 nm, has high fluorescence when the closed-loop state ranges from 400 nm to 550 nm, can be applied to a fluorescent photoswitch, an anti-forgery technology, a short-wavelength high-density holographic optical storage material and the like, and compared with the symmetrical thiophene or benzothiophene octafluorocyclopentene material, the material preparing cost is lower, and the application prospect is broader.
Synthesis, crystal structure and photochromism of new diarylethenes with a benzene moiety
Fan, Congbin,Pu, Shouzhi,Liu, Gang
, p. 235 - 242 (2014/06/09)
Three unsymmetrical diarylethenes with both thiophene and benzene moieties were synthesized. Their crystal structures and photochromic features were investigated systematically to elucidate the substituent effects of the terminal phenyl group on photochromism. Computational studies were performed to provide further insight into their frontier molecular orbitals and spatial distributions of electronic density. Each compound exhibited favorable photochromism in hexane and functioned as notable fluorescent photo-switches with fluorescence quenching efficiency of ～96% induced by the intensity change of UV/vis light. Among the three diarylethenes, the cyano group on the terminal phenyl group significantly decreased the distance of the two reactive carbon atoms and strengthened the intermolecular hydrogen bond stacking interactions, resulting in improved stability in crystal state. Furthermore, it exhibited a red-shifted absorption maximum, an enhanced molar absorption coefficient, cyclization quantum yield, and fluorescence quantum yield in solution.
Synthesis and photochromism of novel unsymmetrical diarylethenes with an azaindole unit
Sun, Zhiyuan,Li, Hui,Pu, Shouzhi,Liu, Gang,Chen, Bing
supporting information, p. 2471 - 2475 (2014/05/06)
A new class of unsymmetrical photochromic diarylethenes with an azaindole moiety has been firstly synthesized. Their properties, including photochromism, crystal structure, as well as fluorescence, were investigated systematically. The azaindole was conne
Photochromism of new unsymmetrical diarylethene derivatives bearing both benzofuran and thiophene moieties
Pu, Shouzhi,Wang, Renjie,Liu, Gang,Liu, Weijun,Cui, Shiqiang,Yan, Peijian
experimental part, p. 195 - 206 (2012/05/20)
A new class of unsymmetrical photochromic diarylethenes bearing both benzofuran and thiophene moieties was synthesized and the effects of substitution on their properties were discussed systematically. Two compounds among them show distinctly different conformation in the single crystalline phase: one crystallizes with an anti-parallel conformation which exhibit good photochromism, whereas the other crystallizes with a parallel conformation which exhibits no photochromism in the crystalline phase. Each of the compounds exhibited remarkable photochromism and functioned as a fluorescent switch in both solution and PMMA films. The electron-donating groups significantly increased the cyclization quantum yield, depressed the cycloreversion quantum yield, shifted the emission peak to a longer wavelength, and decreased the emission intensity; while the electron-withdrawing groups functioned as an inverse action for these diarylethene derivatives. The cyclic voltammograms results revealed that these diarylethenes exhibited evident electrochromism during electrolysis and the oxidative cyclization is thermodynamically.
Synthesis and the effects of substitution upon photochromic diarylethenes bearing an isoxazole moiety
Pu, Shouzhi,Li, Hui,Liu, Gang,Liu, Weijun,Cui, Shiqiang,Fan, Congbin
experimental part, p. 1438 - 1447 (2011/03/22)
A new class of unsymmetrical photochromic diarylethenes bearing an isoxazole moiety was synthesized and the effects of substitution on their optical and electrochemical properties were investigated systematically. Each of the compounds exhibited remarkabl
Effects of substitution on the optoelectronic properties of photochromic diarylethenes bearing a pyrrole moiety
Liu, Gang,Pu, Shouzhi,Wang, Xiaomei,Liu, Weijun,Yang, Tianshe
experimental part, p. 71 - 81 (2011/12/01)
Five diarylethenes bearing a pyrrole moiety were synthesized in order to investigate the effects of the substituents on the properties of these compounds. The structures of three of the diarylethenes were determined by single-crystal X-ray diffraction ana
Photochromism of new 3,5-position hybrid diarylethene derivatives bearing both thiophene and thiazole moieties
Liu, Gang,Pu, Shouzhi,Wang, Xiaomei
experimental part, p. 8862 - 8871 (2011/01/04)
Five new diarylethenes based on a hybrid structure of bis(5-thiazolyl) ethene and bis(3-thienyl)ethene were synthesized, and the structures of the four compounds were determined by single-crystal X-ray diffraction analysis. The properties of these diaryle
The photochromism of unsymmetrical diarylethene isomers with an electron-withdrawing cyano substituent
Pu, Shouzhi,Liu, Weijun,Liu, Gang
experimental part, p. 1 - 9 (2010/07/06)
Three unsymmetrical isomeric diarylethenes bearing an electron-withdrawing cyano group were synthesized and their structures determined using single-crystal X-ray diffraction analysis. Each of the compounds displayed excellent photochromism in solution, in PMMA film, as well as in the crystalline phase. The isomeric compounds also functioned as a fluorescence switch in PMMA films. The cyclization quantum yield and the absorption maxima of both the ring-opened and ring-closed isomers increased in the order: ortho- a marked effect on the electrochemical behaviours of these isomeric diarylethenes.
