- Photovoltaic Devices Prepared through a Trihydroxy Substitution Strategy on an Unsymmetrical Squaraine Dye
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A series of unsymmetrical arene-1,3-squaraine (USQ) derivatives with two, three, or four hydroxy (?OH) substituents, namely, USQ-2-OH, USQ-3-OH, or USQ-4-OH, respectively, were designed and synthesized, and the effect of the number of hydroxy groups on the optoelectronic properties of USQs were investigated. Despite the three compounds having similar UV/Vis absorption and HOMO energy levels, solution-processed bulk-heterojunction (BHJ) small-molecule organic solar cells with USQ-3-OH as electron-donor materials exhibit the highest power conversion efficiency of 6.07 %, which could be mainly attributed to the higher hole mobility and smaller phase separation. It is also noteworthy that the short-circuit current (Jsc) of the USQ-3-OH-based device is as high as 14.95 mA cm?2, which is the highest Jsc values reported for squaraine-based BHJ solar cells to date. The results also indicate that more ?OH substituents on squaraine dyes do not necessarily lead to better photovoltaic performance.
- Wu, Jianglin,Si, Changfeng,Chen, Yao,Yang, Lin,Hu, Bin,Chen, Guo,Lu, Zhiyun,Huang, Yan
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Read Online
- Syntheses and photophysical properties of aminobenzopyranoxanthene dyes containing various alkyl chains at amine moieties
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Aminobenzopyranoxanthene (ABPX) dyes containing linear n-alkyl chains at amino groups were synthesized, and their cis and trans stereoisomers were isolated. Detailed spectrophotometric studies revealed that all the ABPX derivatives exhibited fluorescence emission in the far-red and near-infrared wavelength regions, and their fluorescence quantum efficiency increased with increasing n-alkyl chain length. Almost no differences in photophysical properties were observed between the cis and trans stereoisomers.
- Kamino, Shinichiro,Tanioka, Masaru,Sawada, Daisuke,Enomoto, Shuichi
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p. 1167 - 1176
(2019/12/11)
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- Monocarboxylate transporter 1 inhibitors as potential anticancer agents
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Potent monocarboxylate transporter 1 inhibitors (MCT1) have been developed based on α-cyano-4-hydroxycinnamic acid template. Structure-activity relationship studies demonstrate that the introduction of p-N, N-dialkyl/diaryl, and o-methoxy groups into cyanocinnamic acid has maximal MCT1 inhibitory activity. Systemic toxicity studies in healthy ICR mice with few potent MCT1 inhibitors indicate normal body weight gains in treated animals. In vivo tumor growth inhibition studies in colorectal adenocarcinoma (WiDr cell line) in nude mice xenograft models establish that compound 27 exhibits single agent activity in inhibiting the tumor growth.
- Gurrapu, Shirisha,Jonnalagadda, Sravan K.,Alam, Mohammad A.,Nelson, Grady L.,Sneve, Mary G.,Drewes, Lester R.,Mereddy, Venkatram R.
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supporting information
p. 558 - 561
(2015/05/27)
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- SECOND-ORDER NONLINEAR OPTICAL COMPOUND AND NONLINEAR OPTICAL ELEMENT COMPRISING THE SAME
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Problem to Be Solved: to provide a chromophore having a far superior nonlinear optical activity to conventional chromophores and to provide a nonlinear optical element comprising said chromophore. Solution: a chromophore comprising a donor structure D, a π-conjugated bridge structure B, and an acceptor structure A, the donor structure D comprising an aryl group substituted with a substituted oxy group; and a nonlinear optical element comprising said chromophore.
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Page/Page column 119-120
(2012/07/14)
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- Transition metal-free amination of aryl halides-A simple and reliable method for the efficient and high-yielding synthesis of N-arylated amines
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A simple and reliable reaction protocol for the clean, fast, and high-yielding synthesis of various N-arylated amines derived from reactions of aryl halides with various (also sterically hindered) amines under transition metal-free reaction conditions is presented. Dioxane and KN(Si(CH3)3)2 were found to be the ideal solvent and base for this transformation. The conversion rates and yields observed are excellent and in the majority of the reactions performed significantly higher than that obtained in their catalyzed versions. Furthermore, the selective synthesis of 6-halopyridin-2-amines and asymmetric pyridine-2,6-diamines (derived from consecutive reactions of 2,6-dibromopyridine and 2,6-dichloropyridine, respectively, with different amines) is possible in almost quantitative yields (relative to 2,6-dihalopyridine) within very short reaction times. Purification of the 6-halopyridin-2-amine intermediates is not necessary, allowing the synthesis of pyridine-2,6-diamines in 'one-pot'. However, catalysts are in many cases not required to efficiently and selectively couple aryl halides with amines, making transition metal-free versions of the Buchwald-Hartwig reaction extremely attractive for the synthesis of N-arylated amines with substrates containing substituents on the aryl halide, which either promote regioselectivity and/or do not require regioselective aminations.
- Bolliger, Jeanne L.,Frech, Christian M.
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supporting information; experimental part
p. 1180 - 1187
(2009/04/10)
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- The use of palladium chloride as a precatalyst for the amination of aryl bromides
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The use of palladium chloride as a precatalyst for the amination of aryl bromides is reported. To overcome the poor solubility of palladium chloride in commonly used solvents, a procedure was developed in which PdCl2 was preheated with neat amine in the presence of a phosphine ligand before the addition of the other reaction components. This protocol is effective for a broad range of substrate combinations using several types of phosphine ligands.
- Zhang, Xiao-Xiang,Harris, Michele C.,Sadighi, Joseph P.,Buchwald, Stephen L.
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p. 1799 - 1805
(2007/10/03)
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