Angewandte Chemie International Edition

Researchers at Kanazawa University report in Angewandte Chemie International Edition how the formation and deformation speed of interlocked molecular structures called rotaxanes can be tuned — a discovery that may lead to an enhanced functionality of rotaxanes as building blocks for molecular machines.

Researchers used a chemical synthesis robot and computationally cost effective A.I. model to successfully predict and validate highly selective catalysts.

A research group at Osaka Metropolitan University has discovered that 2,5-distyrylpyrazine (DSP) crystals undergo a unique photoreaction. Normally, photoreactive color changes proceed uniformly throughout photomechanical molecular crystals, so that all parts of each crystal change color at the same time. However, when light shines evenly on a DSP crystal, the photoreaction propagates from edge to center, deviating from conventional photochemistry models. The group found that this phenomenon was caused by a surface effect and a cooperative effect, which make reactivity extremely high for molecules at the crystal’s edge and those adjacent to molecules that have already changed color.

Researchers from the Osaka Metropolitan University Graduate School of Engineering have successfully developed a new technique allowing them to observe gas molecules packing into metal-organic frameworks (MOF) using infrared spectroscopy. Their innovation was to measure polarized light absorption of guest molecules in a MOF film to deduce molecule alignment using this common piece of lab equipment. This method is the first to show guest alignment and does so in real-time, while using an accessible and easily adoptable experimental setup. A short video (4 min) recreating their spectrometer modifications can be found in the Reference section.

Soot as a surprising source of haze-building hydroxyl radicals

Adding lead and calcium to an industrial catalyst dramatically improves its ability to support propylene production at very high temperatures, making it stable and active for a month.

A multi-institutional Japanese team has developed new magnetic design that has magic mirror-like properties. Based on organic-inorganic hybrid perovskite type compounds, the brightness of transmitted light changes depending on whether the material is viewed from the front or the back.

Hokkaido University researchers have developed a simple method that converts existing generic polymers into luminescent polymers using mechanical force.

A design concept changes how materials separate gaseous mixtures.

Scientists have found an ingredient that makes a vaccine more effective through an approach more often seen in materials science – testing molecules that self-assemble into larger structures.

A Hokkaido University research group has successfully demonstrated that carbon-carbon (C-C) covalent bonds expand and contract flexibly in response to light and heat. This unexpected flexibility of C-C bonds could confer new properties to organic compounds.

A hemispherical vanadium oxide cluster has a cavity that can accommodate a bromine molecule. It was found that a bromine molecule trapped in the cavity was polarized and that an alkane molecule like pentane, butane and propane could be brominated with the bromine molecule in the cavity with a selectivity differing from ordinary bromination. The present findings are expected to be useful for polarization of small molecules and design of highly functional catalysts.

Metal-organic frameworks (MOFs) are sponge-like organic-inorganic hybrid materials and have a variety of uses due to their ultra-high “porosity,” or the ratio of pores or air pockets to the solid material. Through a technique called “post-synthetic modification,” Professor Jinhee Park and her research team were able to enhance and modify the function of these materials for specific purposes.

Converting crystalline metal-organic frameworks into glass or liquid could give them unique properties and lead to the design of new materials.

Scientists in South Korea used the Zinc Finger protein to develop a new manufacturing technique for size-controllable magnetic Nanoparticle Clusters.