40231-03-6Relevant articles and documents
Photoinduced cis-to-trans isomerization of poly(2-ethynylthiophene) prepared with a [Rh(norbornadiene)Cl]2 catalyst. 1H NMR, UV, and ESR studies
Nakamura, Minoru,Tabata, Masayoshi,Sone, Takeyuki,Mawatari, Yasuteru,Miyasaka, Atsushi
, p. 2000 - 2004 (2002)
Poly(2-ethynylthiophene) was stereoregularly prepared with a Rh complex catalyst, [Rh-(norbornadiene)Cl]2, to selectively produce the cis-transoid isomer in high yields when triethylamine was used as the polymerization solvent at 20 °C. Photoinduced cis-to-trans isomerization was newly found to take place when the film of a pristine cis-transoid polymer was photoilluminated using a Xe lamp with light of wavelength, 320-500 nm under vacuum for 5 h. The cis and trans polymers obtained before and after the illumination were characterized in detail using 1H NMR, UV-vis of solution and film, and electron spin resonance methods.
Multi-fold Sonogashira coupling: A new and convenient approach to obtain tetraalkynyl anthracenes with tunable photophysical properties
Islam, Khadimul,Narjinari, Himani,Bisarya, Akshara,Kumar, Akshai
, p. 9692 - 9704 (2021/11/30)
For the first time, a direct single-step one-pot route to access nine new symmetric tetraalkynylated anthracenes via Pd(CH3CN)2Cl2/cataCXiumA catalyzed tetra-fold Sonogashira coupling is reported. Five of these tetraalkynylated anthracenes have been crystallographically characterized, with two of them exhibiting multiple interactions that significantly shorten the inter-planar distances in the solid-state structure. The rich photophysical properties exhibited by these molecules hold immense promise for future applications in sensors and optoelectronic devices. Two of the considered tetraalkynylated anthracenes comprising a D-π-A-π-D motif demonstrate solvatochromism and halochromism, with one of them showing a low bandgap of 1.79 eV. The remaining compounds demonstrate bandgaps in the range of 1.79-2.04 eV.
Benzosiloles with Crystallization-Induced Emission Enhancement of Electrochemiluminescence: Synthesis, Electrochemistry, and Crystallography
Yang, Liuqing,Koo, Donghyun,Wu, Jackie,Wong, Jonathan M.,Day, Tyler,Zhang, Ruizhong,Kolongoda, Harshana,Liu, Kehan,Wang, Jian,Ding, Zhifeng,Pagenkopf, Brian L.
supporting information, p. 11715 - 11721 (2020/08/10)
Crystallization-induced emission enhancement (CIEE) was demonstrated for the first time for electrochemilunimescence (ECL) with two new benzosiloles. Compared with their solution, the films of the two benzosiloles gave CIEE of 24 and 16 times. The mechani