117850-52-9Relevant articles and documents
Investigation of novel carbazole-functionalized coumarin derivatives as organic luminescent materials
Yu, Tianzhi,Zhu, Zeyang,Bao, Yanjun,Zhao, Yuling,Liu, Xiaoxiao,Zhang, Hui
, p. 260 - 269 (2017)
Four new carbazole-based coumarin derivatives comprising a carbazole core and one or two coumarin chromophores, 7-(diethylamino)-3-(4-(9-(p-tolyl)-9H-carbazol-3-yl)phenyl)coumarin (Cz-Ph-C) and 3,3'-((9-(p-tolyl)-9H-carbazole-3,6-diyl)bis(4,4′-phenyl))bis
Sectional intramolecular charge transfer manipulating in a D-A-D' coumarin derivative for recessive rewritable paper
Duan, Lian,Guo, Kunpeng,Guo, Li,Li, Da,Li, Jie,Liang, Xiaozhong,Sun, Yue,Wang, Shu,Wu, Tong,Zhao, Huijun
, (2021)
External-stimuli-responsive rewritable paper has attracted significant attention for application in secure information. However, to encrypt information on papers which can not be read out under visible light is still challenging. In this work, recessive rewritable paper for security information handling was realized via sectional intramolecular charge transfer (SICT) manipulating in a delicately designed coumarin derivative CMNT. By rational arranging a thiophenyl group and a diethylamino group as electron donors at the 3- and 7-position of coumarin skeleton, respectively, CMNT exhibited obvious fluorescence switching upon BF3 and trimethylamine stimuli. After impregnating a filter paper into CMNT solution with low concentration (1 × 10?6 M), no color change of the paper could be observed under visible light. Meanwhile, when writing and erasing the information on the paper by BF3 ink and trimethylamine eraser, respectively, the process can only be witnessed under UV light. Studies revealed the ICT effect from diethylamino group to chromen-2-one was suppressed after adding BF3, while the ICT channel from thiophenyl group to chromen-2-one was retained, thus producing such unique phenomenon.
Synthesis, characterisation, and electroluminescence properties of N-coumarin derivatives containing peripheral triphenylamine
Kotchapadist, Palita,Prachumrak, Narid,Sunonnam, Thitiya,Namuangruk, Supawadee,Sudyoadsuk, Taweesak,Keawin, Tinnagon,Jungsuttiwong, Siriporn,Promarak, Vinich
, p. 496 - 505 (2015)
A series of N-coumarin derivatives, namely CThnT and CThnCT (n = 1-2), containing triphenylamine or triphenylaminesubstituted carbazole as substituent were synthesised, and their structures were confirmed by MALDITOF MS, and NMR and IR spectroscopy. Their optical, physical and electroluminescence properties as non-doped solutionprocessed light-emitters for OLEDs were investigated. DSC, TGA, AFM and PL spectra revealed their good filmforming properties, high thermal and morphological stability, and good photoluminescence characteristics. The doublelayer solution-processed OLEDs (ITO/PEDOT:PSS/EML/BCP/LiF:Al) fabricated using CThnT and CThnCT as the emissive layer and BCP as the electron-transporting and hole-blocking layer, exhibited stable green to orange electroluminescence (λEL = 536-592 nm) with turn-on voltages of 2.7-2.9 V and maximum luminance efficiencies up to 3.94 cdA-1 at 17.6 mAcm-2 (maximum power efficiency of 1.62 lmW-1).
Design and Synthesis of Coumarin–Imidazole Hybrid Chromophores: Solvatochromism, Acidochromism and Nonlinear Optical Properties
Bhagwat, Archana A.,Avhad, Kiran C.,Patil, Dinesh S.,Sekar, Nagaiyan
, p. 740 - 754 (2019)
A set of linear and asymmetric coumarin–imidazole hybrid compounds having a N,N-diethylamine at 7-position and imidazole at 3-position on the coumarin were synthesized. Insertion of thiophene π-spacer between coumarin and imidazole moieties (5b, 5d) leads to redshifted absorption and emission compared to 5a and 5c. All the compounds show a noticeable response to trifluoroacetic acid with a redshifted absorption and an increase in emission intensity by twofold. The ratio of ground and excited state acidity constant was calculated using F?rster energy cycle, and the ratios were found to be 0.25, 0.96, 0.52 and 1.87, respectively, for 5a-5d. Due to the thiophene π-spacer, elongation of π-conjugation in 5b and 5d leads to high values of polarizability (α), first-order hyperpolarizability (β) and second-order hyperpolarizability (γ). Compound 5b exhibits a high value (895 GM) of two-photon absorption cross section (σ2PA), measured using two-level model.
Coumarins as powerful photosensitizers for the cationic polymerization of epoxy-silicones under near-UV and visible light and applications for 3D printing technology
Abdallah, Mira,Dumur, Frédéric,Hijazi, Akram,Lalevée, Jacques
supporting information, (2020/05/16)
In this study, eight coumarins (coumarins 1–8) are proposed as near-UV and blue light sensitive photoinitiators/photosensitizers for the cationic polymerization (CP) of epoxysilicones when combined with 4-isopropyl-4’-methyldiphenyliodonium tetrakis(pentafluorophenyl)borate (IOD). Among these coumarins, four of them (coumarins 1, 2, 6 and 8) have never been reported in the literature, i.e., these structures have been specifically designed to act as photoinitiators for silicones upon near UV and visible irradiation. Good final reactive epoxy function conversions (FCs) and also high rates of polymerization (Rp) were achieved in the presence of the newly proposed coumarin-based systems. The polymers generated from the photopolymerization of epoxysilicones can be considered as attractive candidates for several applications such as: elastomers, coatings, adhesives, and so on. The goal of this study focuses also on the comparison of the new proposed coumarins with well-established photosensitizers i.e., 1-chloro-4-propoxythioxanthone (CPTX), 9,10-dibutoxyanthracene (DBA) or some commercial coumarins (Com. Coum). As example of their high performance, the new proposed coumarins were also used for laser write experiments upon irradiation with a laser diode at 405 nm in order to develop new cationic 3D printing systems.
