Pressure-induced remarkable luminescence switch of a dimer form of donor-acceptor-donor triphenylamine (TPA) derivative was written by Li, Aisen;Chu, Ning;Liu, Jianwei;Liu, Hao;Wang, Jing;Xu, Shuping;Cui, Haining;Zhang, Hongyu;Xu, Weiqing;Ma, Zhiyong. And the article was included in Materials Chemistry Frontiers in 2019.Application In Synthesis of 2,6-Dibromoisonicotinonitrile This article mentions the following:
Two newly synthesized mols. with a twisted donor-acceptor-donor (D-A-D) structure were achieved, noted as TPA-Ph-CN and TPA-Py-CN, and their solvatochromic effects and mechanochromic properties upon grinding and/or under hydrostatic pressure were investigated deeply. The comparison of their solvatochromic behaviors demonstrates that TPA-Py-CN shows a stronger intramol. charge transfer (ICT) effect than TPA-Ph-CN due to the substitution of electron-deficient acceptor from Ph-CN to Py-CN. Photophys. characterizations together with the anal. of crystal structures indicate that TPA-Py-CN exhibits a distinct dimer structure with C-H···π interactions, but TPA-Ph-CN does not. As a result, TPA-Py-CN shows green emission with three bands and the peak at 538 nm is assigned to excimer, while TPA-Ph-CN presents blue emission with only one band. Upon grinding, TPA-Py-CN shows more sensitive responsiveness to pressure than TPA-Ph-CN and exhibits a size-dependent emission property. TPA-Ph-CN only displays continuous red-shifted and broadened emission under hydrostatic pressure. In contrast, high pressure experiments and theor. calculations of TPA-Py-CN demonstrate that the excimer fluorescence wavelength is pressure-independent. This study is helpful for better understanding intrinsic essences of the mol. structure and the properties of mechano-responsive organic mols. In the experiment, the researchers used many compounds, for example, 2,6-Dibromoisonicotinonitrile (cas: 408352-58-9Application In Synthesis of 2,6-Dibromoisonicotinonitrile).
2,6-Dibromoisonicotinonitrile (cas: 408352-58-9) belongs to pyridine derivatives. Pyridine has a conjugated system of six π electrons that are delocalized over the ring. The molecule is planar and, thus, follows the Hückel criteria for aromatic systems. Pyridine groups exist in countless molecules, and their applications include catalysis, drug design, molecular recognition, and natural product synthesis.Application In Synthesis of 2,6-Dibromoisonicotinonitrile