Here we demonstrate that a fluorescent benzothiadiazole (BTD)-conjugated terphenyldicarboxylate (TPDC) linker (denoted as H2-ostpdc) has been hybridized by a quinoxaline-2,3-(1H,4H)-dione (QD) moiety possessing lactam-lactim tautomerism, which was further integrated into a robust and porous UiO-68 type zirconium metal–organic framework (MOF UiO-68-osdm) by utilizing the mixed two dicarboxylate struts with the same ligand lengths. The resultant MOF UiO-68-osdm can work as a ratiometric luminescent sensor for visual and selective detection of alkyl amines. Furthermore, it can discriminate secondary alkylamines from other type amine species.Keywords: lactam-lactim tautomerism; linker design; luminescent metal−organic framework; ratiometric sensor; volatile organic amine;

An unprecedented visible-light-induced direct C(sp2)–H amination of aryl aldehyde-derived hydrazones was developed by using N-acyloxyphthalimides as nitrogen-radical precursors. This reaction represents a new way to substituted hydrazones with amination of carbon–nitrogen π bonds. A radical C–H amination mechanism is proposed.

Oxalyl chloride and phosgene are highly toxic chemicals but are widely used in industrial processes, which have been regarded as a serious threat to our health and public security. Thus, it is imperative to develop a convenient and reliable detection method for these noxious agents. In this research, we report the rational design of a fluorescent sensor (denoted as BTA) for simultaneously detecting oxalyl chloride and phosgene, in which o-phenylenediamine (OPD) as the reactive recognition site and benzothiadiazole (BTD) as the fluorophore moiety are coupled into one single benzo-fused motif. The probe works in a “turn-on” fluorescence mode due to the formation of piperazine-2,3-dione and 2-imidazolidinone rings by intramolecular cyclization reactions between the OPD part with oxalyl chloride and phosgene, respectively, which greatly inhibits the intramolecular charge transfer (ICT) process from two amines to the BTD core in the sensor BTA. The detection limit of oxalyl chloride and phosgene is as low as 3 nM and 20 nM in solutions, respectively. Moreover, the sensor exhibits outstanding selectivity toward oxalyl chloride and phosgene over the nerve-agent mimic diethyl chlorophosphate and various acyl chlorides. Furthermore, a portable test paper with BTA has been facilely fabricated for visual on-site detection of the two toxic chemicals in the gas phase.

A zirconium(IV)-based UiO-topological metal–organic framework (UiO-68Se) containing benzoselenadiazole was synthesized by an approach of the mixed dicarboxylate struts, which show highly efficient and recycalable photocatalytic activity for aerobic cross-dehydrogenative coupling reactions between tertiary amines and various carbon nucleophiles under visible-light irradiation.

The organic photosensitizer diiodo-BODIPY has been covalently conjugated into a Zr(IV)-based metal–organic framework with UiO topology via postsynthetic modification, which serves as a highly active and recyclable heterogeneous photocatalyst for aerobic cross dehydrogenative coupling and oxidation/[3 + 2]cycloaddition reactions under visible light irradiation.

•Anatase/rutile TiO2 hierarchical nanorods (ARTHNs) were prepared.•ARTHNs consist of central rutile nanorods and external anatase nanolines.•Exposed (010) facets of rutile and anatase phases were observed in ARTHNs.•ARTHNs based lithium ion batteries exhibited good electrochemical properties.The hybrid anatase/rutile TiO2 hierarchical nanorods (ARTHNs) with exposed specific faces have been facilely synthesized by one-step hydrothermal reaction. Powder X-ray diffraction and Raman studies confirm the mixed bicrystalline phase of anatase and rutile in ARTHNs. Scanning electron microscopy clearly shows the morphologies of ARTHNs were hierarchical nanorods with lengths of about 2–5 μm and diameters of around 300 nm, and transmission electron microscopy analysis further indicate that ARTHNs are composed of central rutile nanorods and external anatase nanosheets with both of exposed (010) facets. Due to the exposed (010) facets in hybrid phase of ARTHNs, they exhibit a higher lithium storage performance than the commercial analogue P25.

The targeted delivery of a photosensitizer (PS) into specific cancer cells is an effective way to enhance the efficacy and minimize the side effects of photodynamic therapy. Herein, heptamannosylated β-cyclodextrin (β-CD) was used to mediate the formation of an adamantane (Ad)-functionalized BODIPY PS nanoparticle via strong β-CD/Ad complexation. The mannose-functionalized PS nanoparticles are selectively internalized by mannose-receptor-rich MDA-MB-231 breast cancer cells via receptor-mediated endocytosis, facilitating singlet oxygen generation to trigger apoptosis in cancer cells upon red-light irradiation. These nanoparticles exhibit excellent targeted delivery of the PS, leading to cancer cell death after irradiation both in vitro and in vivo.Keywords: BODIPY; mannose-mediated targeting; photodynamic therapy; photosensitizer; supramolecular chemistry;

•Dendritic hexacarboxylate linker containing amine and triazole groups•Amine functionalized rht-type copper(II) metal-organic framework•High CO2 and H2 uptake capacities and selectivity of CO2 over N2A dendritic hexacarboxylate ligand featuring amine and triazole groups was rationally designed and synthesized, which was employed to construct a (3,24)-connected rht-type copper(II) metal-organic framework (MOF, NTU-105-NH2) under solvothermal conditions. The desolvated amine-functionalized MOF demonstrated improved CO2 and H2 uptake capacity as well as significant higher selectivity towards CO2 over N2 in comparison to its parent MOF.A triazole and amine dually functionalized MOF exhibited high CO2 and H2 uptake capacity as well as high selectivity towards CO2 over N2.

AIE-active luminogen tetraphenylethene (TPE) was incorporated into a UiO-isoreticular zirconium metal–organic framework via the strategy of mixed dicarboxylate struts, and the resulting functionalized MOF shows a strong blue-green emission and selective sensing of nitroaromatic explosives 2,4,6-trinitrophenol (TNP) and 2,4-dinitrophenol (DNP) through fluorescence quenching. Moreover, the luminescent MOF exhibits efficient photocatalytic activity for aerobic cross-dehydrogenative coupling reactions mediated by visible light.