<i>s</i>-Triazine-Based Functional Discotic Liquid Crystals: Synthesis, Mesomorphism and Photoluminescence
作者:B. N. Veerabhadraswamy、Hashambi K. Dambal、D. S. Shankar Rao、C. V. Yelamaggad
DOI:10.1002/cphc.201600280
日期:2016.7.18
Examination of the phase transitional properties by several complementary techniques evidenced self‐assembly into a hexagonal columnar phase, occurring over wide and reasonable thermal ranges. The photophysicalproperties were studied both in solution and in the fluid/frozen columnar states by UV/Vis absorption and photoluminescence spectroscopy. The emission spectra obtained as a function of the temperature
Multibranched triarylamine derivatives with a 1,3,5-triazine core have been synthesized and exhibit aggregation-induced emission and a large two-photon absorption cross section (8629 GM).
Two new multibranched thiophene-based triarylamine derivatives with 1,3,5-triazine core are synthesized and characterized. Their one- and two-photon absorption properties and aggregation-induced emission effect have been investigated. Both the STAPA-based compounds are AIE active. The two-photon absorption (2PA) cross sections measured by the open aperture Z-scan technique are determined to be 620 and 1610 GM for STAPA-a and STAPA-b in chloroform, respectively, which dramatically increase with the introduction of alkyl chains. The relationship between their structures and properties on one- and two-photon absorption and aggregation-induced emission is discussed, which allows us to examine the effect of introducing alkyl chains. In addition, solvent effects also show a significant influence on the 2PA cross section. The two compounds with excellent AIE and 2PA properties provide attractive alternatives for the biophotonic materials.
A new s-triazine-based C3 buildingblock, endowed with three phosphonate groups, has been prepared in a simple two-step synthesis starting from p-bromomethylbenzonitrile; the new buildingblock easily undergoes further olefination reactions to afford in a straightforward manner tris(tetrathiafulvalene)- and tris(ferrocene)-1,3,5-triazines.
Efficient synthesis of vinylene-linked conjugated porous networks <i>via</i> the Horner–Wadsworth–Emmons reaction for photocatalytic hydrogen evolution
vinylene-linked conjugatedporous networks was developed. Based on the Horner–Wadsworth–Emmons reaction, the condensation polymerization for the formation of an sp2 carbon-linkage can be achieved at room temperature. The resulting vinylene-linked frameworks exhibit a promising porous nature with the best surface area of up to 1373 m2 g−1. Their intrinsic conjugated architectures and semiconducting properties
开发了一种简单而有效的合成方法,用于构建亚乙烯基连接的共轭多孔网络。基于 Horner-Wadsworth-Emmons 反应,可以在室温下实现用于形成 sp 2碳键的缩聚反应。所得的亚乙烯基连接的骨架表现出有前途的多孔性质,其最佳表面积高达 1373 m 2 g -1。它们固有的共轭结构和半导体特性导致在可见光照射下从水中光催化析氢。这种新的合成方法为制备有吸引力的 sp 2碳连接的多孔有机骨架提供了一种简便的方法。