A series of organic host–guest materials with multifunctional luminescence were constructed. Four isoquinoline derivatives were used as the guests, and benzophenone was used as the host. The doped system exhibited excellent dual emission with cyan fluorescence and orange-yellow room-temperature phosphorescence, and the dual emission could be combined into almost pure white-light emission. Importantly, the relative intensity of the fluorescence–phosphorescence could be adjusted by changing the excitation wavelength, with the phosphorescence intensity being significantly higher than the fluorescence intensity under shorter excitation wavelengths and vice versa under longer excitation wavelengths. Therefore, three-color emission switching among cyan, white, and orange could be achieved by simply adjusting the excitation wavelength. The results of experimental and theoretical calculations indicated that the excitation-dependent emission colors were caused by different transfer paths for excitons under different excitation wavelengths. These materials with multifunctional luminescence could be used as writable inks for advanced anticounterfeiting.

Conjugated microporous polymers (CMPs) are a class of crosslinked polymers that combine permanent micropores with p-conjugated skeletons and possess three-dimensional (3D) networks. Compared with conventionalm aterials such as metal-organic frameworks (MOFs) and covalent organic frameworks (COFs), CMPs usually have superior chemical and thermals tability.C MPs have made significant progress in heterogeneous catalysis in the past seven years. With ab ottom-up strategy,c atalytic moietiesc an be directly introduced into in the framework to produce heterogeneous CMP catalysts. Higher activity,s tability,a nd selectivity can be obtained with heterogeneousC MP catalysts in comparison with their homogeneous analogs.I na ddition, CMP catalysts can be easily isolated and recycled. In this review,w ef ocus on CMPs as an intriguing platform for developingv arious highly efficient and recyclable heterogeneous catalysts in organic reactions. The design, synthesis, and structure of these CMP catalysts are also discussed in this focus review.

A series of pyridine-type ligands containing C≡C bonds were designed and synthesized for selective oxidative Heck reaction. These ligands were utilized as functional units and integrated into the skeleton of conjugated microporous polymers. 6,6'-diiodo-2,2'-bipyridine and 1,3,5-triethynylbenzene were polycondensed via Sonogashira cross-coupling strategy to afford CMP-1 material. The resultant CMP-1 was used as a heterogeneous catalytic ligand for the Pd-catalyzed oxidative Heck reaction with high linear selectivity. The linear selectivity of CMP-1 is about 30 times higher than that of bipyridine-based monomer ligand. This work opens a new front of using CMP as an intriguing platform for developing highly efficient catalysts in controlling the regioselectivity in organic reactions.

Cellular autofluorescence can affect the sensitivity of fluorescence microscopic or flow cytometric assays by interfering with or even precluding the detection of low-level specific fluorescence. Here we developed a method to detect and quantify bacterial autofluorescence in the green region of the spectrum at the single-cell level using a laboratory-built high-sensitivity flow cytometer (HSFCM). The detection of the very weak bacterial autofluorescence was confirmed by analyzing polystyrene beads of comparable and larger size than bacteria in parallel. Dithionite reduction and air re-exposure experiments verified that the green autofluorescence mainly originates from endogenous flavins. Bacterial autofluorescence was quantified by calibrating the fluorescence intensity of nanospheres with known FITC equivalents, and autofluorescence distribution was generated by analyzing thousands of bacterial cells in 1 min. Among the eight bacterial strains tested, it was found that bacterial autofluorescence can vary from 80 to 1400 FITC equivalents per cell, depending on the bacterial species, and a relatively large cell-to-cell variation in autofluorescence intensity was observed. Quantitative measurements of bacterial autofluorescence provide a reference for the background signals that can be expected with bacteria, which is important in guiding studies of low-level gene expression and for the detection of low-abundance biological molecules in individual bacterial cells. This paper presents the first quantification of bacterial autofluorescence in FITC equivalents.

Presented in this work is a novel methodology for the synthesis of selenated benzofurans (or benzothiophenes) via AgNO2-catalyzed radical cyclization of 2-alkynylanisoles (or 2-alkynylthioanisoles), Se powder, and arylboronic acids. This method enables the construction of a benzofuran (benzothiophene) ring, two C–Se bonds, and a C–O­(S) bond as well as the cleavage of a C–O­(S) bond in a single step. Preliminary mechanistic studies imply that the AgNO2-catalyzed cyclization proceeds via an aryl selenium radical intermediate.