51545-36-9Relevant articles and documents
Spacer group-controlled luminescence and response of C 3-symmetric triphenylamine derivatives towards force stimuli
Han, Yanning,Zhang, Tong,Chen, Xinyu,Chen, Qiao,Xue, Pengchong
, p. 202 - 209 (2021/01/14)
Two C3-symmetric triphenylamine derivatives with three terminal cyano units as electron acceptors were prepared to investigate the effect of the spacer group on their photophysical properties and responses towards force. Their electronic transitions were carefully studied by electrochemistry, solvent-dependent spectroscopy and quantum chemical calculations. The results suggested that introducing a double bond between the donor and acceptor results in the longer absorption and emission wavelengths of TPAVCN owing to elevated HOMO and lowered LUMO energy levels and induces a larger excited state dipole moment because of the extended conjugated length. In polar solvents, both TPACN and TPAVCN possessed a longer emission wavelength. Theoretical calculations suggested that bathochromic shifts in emission bands could be ascribed to the large polar excited states owing to the light excitation-induced intramolecular charge transfer. Moreover, TPAVCN had a larger charge transfer length and average degree of the spatial extension of hole and electron distribution because of its longer molecular length. In crystals, TPAVCN had a longer emission wavelength relative to that of TPACN. Moreover, both compounds could reversibly change their fluorescence under force and solvent annealing stimuli, and their mechanochromic properties were regulated by spacer groups. TPACN changed its fluorescence from blue to cyan with a spectral shift of 12 nm after grinding, but a large spectral shift of 30 nm, and an obvious fluorescent color change from green to yellow were observed while grinding pristine TPAVCN solids.
Multicolored electrochromic and electrofluorochromic materials containing triphenylamine and benzoates
Zhang, Wei-Jing,Lin, Xin-Cen,Li, Feng,Huang, Zhen-Jie,Gong, Cheng-Bin,Tang, Qian
supporting information, p. 16412 - 16420 (2020/10/14)
Six novel electrochromic materials, 4,4′,4′′-nitrilotribenzoates (NTBAs, a-f), with donor-acceptor structure, were designed by combining cathodically electrochromic benzoates as a color-tuning unit and anodically electrochromic triphenylamine as a fluorescence-quenching unit to achieve multi-electrochromism and electrofluorochromism. The stereochemistry of the NTBAs was investigated by single-crystal X-ray diffraction. The NTBAs showed a strong blue emission in N,N-dimethylformamide. When the NTBAs were introduced into electrochromic devices (ECDs), all six ECDs showed multicolored electrochromism. All six ECDs displayed electrofluorochromic behavior, which was possibly caused by the monocationic radical formed from the oxidation of the triphenylamine center. The ester substituents markedly influenced the colored states, switching cyclability, coloration efficiency, and electrofluorochromic properties. The compounds with saturated alkyl substituents (a-c) showed three colored states, namely yellow (at ±2.8 V), light red (at ±3.0 V), and orange red (at ±3.6 V), relatively better cyclability, high coloration efficiency (>220 cm2 C-1), and good electrofluorochromic properties. The compound with the shortest chain length (a) performed best. The compound with an unsaturated alkyl substituent (d) showed poor electrochromic and electrofluorochromic properties. The compounds with aryl substituents (e and f) showed three colored states, namely yellow (at ±2.6 V), purple (at ±3.0 V), and claret (at ±3.6 V), moderate coloration efficiency (ca. 200 cm2 C-1), and good electrofluorochromic properties. The cyclability was markedly improved when the aryl substituents contained an electron-donating group.
Highly Interpenetrated Robust Microporous Hydrogen-Bonded Organic Framework for Gas Separation
Yang, Wei,Wang, Jiawei,Wang, Hailong,Bao, Zongbi,Zhao, John Cong-Gui,Chen, Banglin
, p. 6132 - 6137 (2017/11/07)
A hydrogen-bonded organic framework (HOF), HOF-11, has been successfully prepared by the slow diffusion of hexane into a tetrahydrofuran solution of tris(4-carboxyphenyl)amine (TCPA). HOF-11 has been characterized by single-crystal and powder X-ray diffra