Incorporating synthetic macrocycles with unique structures and distinct conformations into conjugated macrocycle polymers (CMPs) can endowthe resulting materials with great potentials in gas uptake and pollutant adsorption. Here, four CMPs (CMP-n, n = 1-4) capable of reversibly capturing iodine and efficiently separating carbon dioxide are constructed from per-triflate functionalized leaning tower[6]arene (LT6-OTf) and [2]biphenyl-extended pillar[6]arene (BpP6-OTf) via Pd-catalyzed Sonogashira-Hagihara cross-coupling reaction. Intriguingly,o wing to the appropriate cavity sizeo f LT6-OTf and the numerous aromatic rings in the framework, the newly designed CMP-4 possesses an outstanding I 2 affinity with alarge uptake capacity of 208 wt %i nv apor and ag reat removal efficiency of 94 %i na queous solutions.T oo ur surprise,w ith no capacity to accommodate nitrogen, CMP-2 constructed from BpP6-OTf is able to specifically capture carbon dioxide at ambient conditions.

In order to facilitate pyrene (PY) excimer formation in solids, several imidazole-containing PY derivatives were designed and synthesized. Among them, a new compound 1,4,5-triphenyl-2-(pyren-1-yl)-4,5-dihydro-1H-imidazole (IM-PY) was achieved with two crystalline...

2D perovskite single crystals have emerged as excellent optoelectronic materials owing to their unique anisotropic properties. However, growing large 2D perovskite single crystals remains challenging and time‐consuming. Here, a new composition of lead‐free 2D perovskite—4‐fluorophenethylammonium bismuth iodide [(F‐PEA)3BiI6] is reported. An oriented bulk 2D wafer with a large area of 1.33 cm2 is obtained by tableting disordered 2D perovskite powders, resulting in anisotropic resistivities of 5 × 1010 and 2 × 1011 Ω cm in the lateral and vertical directions, respectively. Trivalent Bi3+ ions are employed to achieve a stronger ionic bonding energy with I‐ ions, which intrinsically suppress the ion‐migration effect. Thus, the oriented wafer presents good capabilities in both charge collection and ion‐migration suppression under a large applied bias along the out‐of‐plane direction, making it suitable for low‐dosage X‐ray detection. The large‐area wafer shows a sensitive response to hard X‐rays operated at a tube voltage of 120 kVp with the lowest detectable dose rate of 30 nGy s‐1. Thus, the fast tableting process is a facile and effective strategy to synthesize large‐area, oriented 2D wafers, showing excellent X‐ray detection performance and operational stability that are comparable to those of 2D perovskite single crystals.

Methylammonium lead tribromide perovskite single crystals have been demonstrated to be good candidates as sensitive X-ray detectors in direct detection mode in recent years. However, its X-ray detection performance based on the orientation of different facets is still not clear. Here, we developed a facile strategy to chemically expose the [110] facet of single crystals from low-cost solution processes by tailoring the nonstoichiometry of feeding ions to selectively suppress the growth of the [100] facet. In contrast to physically cutting and sawing single-crystal ingots, this avoids damage to the fragile single crystals as well as orientation errors, more suitable for the naturally soft lattice. Compared to the [100] facet, the exposed [110] facet of perovskite single crystals exhibits a smaller trap density and excellent charge carrier transportation properties, leading to an improved sensitivity of 3928.3 μC/Gy air / cm 2 to 120 keV hard X-rays, which potentially outperforms the currently dominating CsI scintillator of a commercial digital radiography (DR) medical imager for a routine health check.

This review highlights advances in material sourcing, molecular mechanisms, clinical progress and new drug design strategies for triptolide from a Chinese medicinal herb, along with some prospects for the future course of development of triptolide.

Oxime, whose dynamic nature was reported to be switchable between ON/OFF by tuning the acidity, is employed in a novel type of dynamic covalent approach that is amenable to use in water for self‐assembly of purely organic molecules with complex topology. In strongly acidic conditions, the dynamic nature of oxime is turned ON, allowing occurrence of error‐checking and therefore a catenane and a macrocycle self‐assembled in high yields. In neutral conditions, oxime ceases to be dynamic, which helps to trap the self‐assembled products even when the driving forces of their formation are removed. We envision that this switchable behaviour might help, at least partially, to resolve a commonly encountered drawback of dynamic covalent chemistry, namely that the intrinsic stability of the self‐assembled products containing dynamic bonds, such as imine or hydrazone, are often jeopardized by their reversible nature.

Herein, we report the self-assembly of an anionic homochiral octahedral cage by condensing six Ga 3+ cations and four trisacylhydrazone ligands.T he robust nature of the hydrazone bond renders the cage stable in water,where it can take advantage of the hydrophobic effect for host-guest recognition. In addition to the internal binding site,n amely, the inner cavity,the octahedral cage possesses four "windows", each of which represents an external binding site allowing peripheral complexation. These internal and external binding sites endowthe cage with the capability to bind abroad range of guests whose sizes could either be smaller than or exceed the volume of the cage'si nner cavity.U pon accommodation of ac hiral guest, one of the two cage enantiomers becomes more favored than the other,p roducing circular-dichroism (CD) signals.T he CD signal intensity of the cage is observed to be proportional to the ee value of the chiral guest, allowing aquantitative determination of the latter.

Condensation of an inherently C3‐symmetric polychlorotriphenylmethyl (PTM) radical trisaldehyde with tris(2‐aminoethyl)amine (TREN) yields a [4+4] tetrahedral radical cage as a racemic pair of homochiral enantiomers in 75 % isolated yield. The structure was characterized by X‐ray crystallography, confirming the homochirality of each cage framework. The homochirality results from intramolecular [CH⋅⋅⋅π] and hydrogen‐bonding interactions within the cage framework. The four PTM radicals in a cage undergo weak through‐space coupling. Magnetic measurements demonstrated that each cage bears 3.58 spins.