114774-08-2Relevant articles and documents
A 2 - carboxamide - 5 - (2 - mercapto - 1, 3 - thiazole - 4 - yl) - thiophene preparation method
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, (2017/08/25)
The invention discloses a preparation method of 2-formylamine-5-(2-sulfhydryl-1, 3-thiazole-4-base)-thiophene. The preparation method comprises the following steps: firstly synthetizing 2-(alpha-methoxyl group ammonia) ethylthiophene, then successively synthetizing 5-acetyl -2-(alpha-methoxyl group ammonia) ethylthiophene, 5-(alpha-methoxyl group ammonia) ethyl-2-thiophene carboxylic acid and a crude product of a 5-acetyl-2-thiophene carboxylic acid, after the crude product of the 5-acetyl-2-thiophene carboxylic acid is re-refined, then successively synthetizing 5-acetyl-2- thiophene acyl chloride, 5-acetyl-2-thiophene acidamide, 5-bromo acetyl -2-thiophene acidamide and 5-acidamide-2-thiophene acetyl thiocyanates, and finally synthetizing the product of the 2-formylamine-5-(2-sulfhydryl-1, 3-thiazole-4-base)-thiophene. The 2-formylamine-5-(2-sulfhydryl-1, 3-thiazole-4-base)-thiophene prepared by the preparation method disclosed by the invention is good in quality and high in yield.
Insight into the roles of structures and energy levels of mono- and bis-β-diketones on sensitizing Nd(III) NIR-luminescence
Li, Bing,Li, Hongfeng,Chen, Peng,Sun, Wenbin,Wang, Cheng,Gao, Ting,Yan, Pengfei
, p. 11459 - 11470 (2016/07/26)
Three neodymium complexes Nd(TTA)3(DMSO)2 (1, TTA = 2-thenoyltrifluoroacetone), Nd2(BDT)3(DMSO)6 (2, BDT = bis(4,4,4-trifluoro-1,3-dioxobutyl)thiophene) and Nd2(BTT)3(DMSO)4 (3, BTT = bis(4,4,4-trifluoro-1,3-dioxobutyl)(2,2′-bithiophene)) constructed from three thiophene-based β-diketonate ligands, were prepared for the purpose of building the relationships between the structures, energy levels of the complexes and NIR luminescence properties of Nd(iii) ions. X-ray crystallographical analysis reveals that complex 1 is a mononuclear structure, the central Nd(iii) ion is coordinated by eight oxygen atoms from three mono-β-diketones (TTA) and two DMSO, whereas, complexes 2 and 3 adopt triple-stranded dinuclear structures, in which the two Nd(iii) ions are wrapped by three bis-β-diketones, the central Nd(iii) ions are nine and eight coordinated by oxygen atoms from ligands and the coordinated DMSO molecules. The photophysical properties related to the electronic transition are characterized by the absorbance spectra, the excitation spectra, the phosphorescence spectra, the emission spectra, the emission quantum yields, and the emission lifetimes. The luminescence quantum yields experiment reveals that the dinuclear complexes (0.49% and 0.33% for 2 and 3) show higher luminescence efficiencies compared to the mononuclear complex 1 (0.22%). This enhancement is mainly attributed to their binuclear structures, which effectively represses the nonradiative transition caused by high-energy oscillators in ligands and/or solvents. On the other hand, the energy level matching also plays an important role in this enhancement.
Facile synthesis of 5-substituted 2-acetylthiophenes
Goda,Sato,Ihara,Hirayama
, p. 849 - 851 (2007/10/02)
5-Substituted 2-(α-alkoxyimino)ethylthiophenes 4-8 are obtained by the reaction of 2-(α-alkoxyimino)ethylthiophenes 3 and electrophilic reagents. Hydrolysis of thiophenes 4-8 produces 5-substituted 2-acetylthiophenes 9-13, respectively. Compounds 3 are easily obtained either by the reaction of 2-acetylthiophene (1) and an O-alkylhydroxylamine or by oxidation of 1 followed by O-alkylation.
