salicylaldehyde derivatives
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2022 ◽  
Author(s):  
Qiao Li ◽  
Yang Zhao ◽  
Zhigang Niu ◽  
Enju Wang

Abstract Two coumarin derivatives, 7-diethylamino-3-(4-nitrophenyl)coumarin (DNC) and 7-hydroxy-3-(4-nitrophenyl)coumarin (HNC), were synthesized via Knoevenagel condensation of salicylaldehyde derivatives with 4-nitrophenylacetonitrile and then cyclization reaction. Both of them were characterized by single-crystal X-ray diffraction. The molecules of DNC are stacked via π-π interaction, while the hydrogen bond interactions instead of π-π interaction were observed in the crystal packing of HNC. Both of DNC and HNC showed solvatochromic properties and aggregation-induced emission (AIE) activities, but the AIE characteristics of them were entirely different. HNC exhibited an AIE phenomenon as the result of the restriction of twisted intramolecular charge transfer (TICT), while DNC emited peculiar dual fluorescence which was assigned to the emission based on the inhibition of TICT state formation and the emission from the TICT state respectively.


2021 ◽  
Vol 240 ◽  
pp. 118431
Author(s):  
Boyu Xie ◽  
Yanyan Zhou ◽  
Ou Sun ◽  
Pengfei Yan ◽  
Ting Gao ◽  
...  

RSC Advances ◽  
2021 ◽  
Vol 11 (59) ◽  
pp. 37171-37180
Author(s):  
Qing Zhang ◽  
Yuanyuan Li ◽  
Zexing Cao ◽  
Chaoyuan Zhu

The emission spectra of triphenylamine salicylaldehyde derivatives are weak in solution and strong in the crystal, as interpreted by molecular spectral and dynamics simulations.


Author(s):  
Weimao Zhong ◽  
Yuchan Chen ◽  
Xiaoyi Wei ◽  
Junfeng Wang ◽  
Weimin Zhang ◽  
...  

2020 ◽  
Vol 73 (8) ◽  
pp. 1306-1313
Author(s):  
Chong Chen ◽  
Jiao Ji ◽  
Chang-Jiu Wang ◽  
Ai-Quan Jia ◽  
Qian-Feng Zhang

2020 ◽  
Vol 501 ◽  
pp. 119266
Author(s):  
Arturo González-Hernández ◽  
Ariana León-Negrete ◽  
Perla Roman-Bravo ◽  
José M. Galván-Hidalgo ◽  
Elizabeth Gómez ◽  
...  

2019 ◽  
Vol 25 (69) ◽  
pp. 15710-15735 ◽  
Author(s):  
Anusha Sebastian ◽  
Vunnam Srinivasulu ◽  
Imad A. Abu‐Yousef ◽  
Orive Gorka ◽  
Taleb H. Al‐Tel

2019 ◽  
Vol 75 (1) ◽  
pp. 65-69
Author(s):  
Wyatt Cole ◽  
Stephanie L. Hemmingson ◽  
Audrey C. Eisenberg ◽  
Catherine A. Ulman ◽  
Joseph M. Tanski ◽  
...  

Four 2,2′-bisindolylmethanes (BIMs), a useful class of polyindolyl species joined to a central carbon, were synthesized using salicylaldehyde derivatives and simple acid catalysis; these are 2-[bis(3-methyl-1H-indol-2-yl)methyl]-6-methylphenol, (IIa), 2-[bis(3-methyl-1H-indol-2-yl)methyl]-4,6-dichlorophenol, (IIb), 2-[bis(3-methyl-1H-indol-2-yl)methyl]-4-nitrophenol, (IIc), and 2-[bis(3-methyl-1H-indol-2-yl)methyl]-4,6-di-tert-butylphenol, (IId). BIMs (IIa) and (IIb) were characterized crystallographically as the dimethyl sulfoxide (DMSO) disolvates, i.e. C26H24N2O·2C2H6OS and C25H20Cl2N2O·2C2H6OS, respectively. Both form strikingly similar one-dimensional hydrogen-bonding chain motifs with the DMSO solvent molecules. BIM (IIa) packs into double layers of chains whose orientations alternate every double layer, while (IIb) forms more simply packed chains along the a axis. BIM (IIa) has a remarkably long c axis.


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