Organic materials with switchable dual circularly polarized luminescence (CPL) are highly desired because they can not only directly radiate tunable circularly polarized light themselves but also induce CPL for guests by providing a chiral environment in self-assembled structures or serving as the hosts for energy transfer systems. However, most organic molecules only exhibit single CPL and it remains challenging to develop organic molecules with dual CPL. Herein, novel through-space conjugated chiral foldamers are constructed by attaching two biphenyl arms to the 9,10-positions of phenanthrene, and switchable dual CPL with opposite signs at different emission wavelengths are successfully realized in the foldamers containing high-polarizability substitutes (cyano, methylthiol and methylsulfonyl).
View Article and Find Full Text PDFACS Appl Mater Interfaces
August 2021
The targeted synthesis of a novel ionic porous organic polymer (iPOP) was reported. The compound (denoted as QUST-iPOP-1) was built up through a quaternization reaction of tris(4-imidazolylphenyl)amine and cyanuric chloride, and then benzyl bromide was added to complete the quaternization of the total imidazolyl units. It featured a special exchangeable Cl/Br-rich structure with high permanent porosity and wide pore size distribution, enabling it to rapidly and effectively remove environmentally toxic oxo-anions including CrO, MnO, and ReO and anionic organic dyes with different sizes including methyl blue, Congo red, and methyl orange from water.
View Article and Find Full Text PDFHerein, we developed a tri-functional MOF heterogeneous catalyst, MIL-IMAc-Br-, by a post-synthesis modification method for the first time. Due to the synergistic role of three functional sites, including Lewis acid sites, Brønsted acid sites and Br- anion sites, MIL-IMAc-Br- displayed an efficient catalytic performance for the cycloaddition reaction of CO2 and epoxides to form cyclic carbonates under mild and co-catalyst free conditions.
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