Atom-efficient synthesis of 2,4,6-trisubstituted 1,3,5-triazines <i>via</i> Fe-catalyzed cyclization of aldehydes with NH<sub>4</sub>I as the sole nitrogen source
作者:Jiang Xiao、Shuang Ren、Qiang Liu
DOI:10.1039/d0ra03323e
日期:——
An atom-efficient, straightforward method for the synthesis of 2,4,6-triaryl-1,3,5-triazines via iron-catalyzed cyclization of aldehydes with NH4I as the sole nitrogen source is demonstrated. This strategy works smoothly under air atmosphere, and affords symmetrical 2,4,6-trisubstituted and unsymmetrical 1,3,5-triazines with yields from 18% to 72%. Compared to other methods, the present protocol provides
Enhanced proton conduction by post-synthetic covalent modification in a porous covalent framework
作者:Partha Samanta、Aamod V. Desai、Bihag Anothumakkool、Mandar M. Shirolkar、Avishek Karmakar、Sreekumar Kurungot、Sujit K. Ghosh
DOI:10.1039/c7ta00964j
日期:——
a remarkably high conductivity (ca. 0.026 S cm−1), with an ∼130 foldenhancement in proton conductivity over the parent compound. This value is comparable with those of commercially used Nafion-based protonconducting materials and stands as the highest known value in the regime of post-synthetically modified porous organic frameworks. It is noteworthy to mention that PCF-1 is stable in both acidic
合成了一种基于醚键的高度化学稳定的多孔共价骨架(PCF-1),在酸性,碱性和氧化性试剂条件下,其在约500°C的温度下都没有损失,并且保持了完整性。由于其热和化学稳定性,合成后进行了共价修饰,以引入侧基磺酸(–SO 3 H)基团。共价改性的化合物(PCF-1-SO 3 H)具有极高的电导率(约0.026 S cm -1),质子电导率比母体化合物提高约130倍。该值与市售的基于Nafion的质子传导材料相当,并且在合成后改性的多孔有机骨架的体系中是已知的最高值。值得一提的是PCF-1在酸性和碱性介质中都是稳定的,对于大多数作为质子传导性材料(包括金属有机骨架)进行试验的多孔材料而言,这通常是不常见的。
Fine adjustment of emission wavelength, light-conversion quality, photostability of blue-violet light conversion agents based on FRET effect
作者:Yanjin He、Yongtao Wang、Yanjun Guo、Lei Ma
DOI:10.1016/j.dyepig.2023.111429
日期:2023.9
synthesized. Based on absorption and emission spectra, aggregation induced emission experiments, and light conversion quality tests, the best formulation of light conversion film are obtained. Among of them, TCZ@0.2TPT@EVAb and MCZ@0.2TPT@EVAb films (40% ethylene vinyl alcohol copolymer defined as EVAb film) show highest photosynthetic photon flux density at 400–500 nm, and matching fluorescence emission (458 nm