A trans–cis photoisomerizable achiral polymer, poly[(9,9-di-n-octylfluorenyl-2,7-diyl)-alt-4,4′-azobenzene] (F8AZO), was designed. The chirality of (S)- and (R)-limonene used as a solvent allowed for the generation of optically active F8AZO aggregates, revealing intense circular dichroism (CD) signals in the visible region. The reversible chiroptical response was achieved upon alternating photoirradiation at 405 nm (trans-form) and 546 nm (cis-form). This ability originated from the switching between the trans-origin aggregation and cis-origin disaggregation of F8AZO in the limonene–2-propanol–chloroform tersolvent.

In this work, we found two hydrophilic interaction liquid chromatography (HILIC) columns for high-performance liquid chromatography (HPLC) suitable for the high-resolution separation of hydrophilic metal clusters. The mass distributions of the product mixtures of hydrophilic metal clusters were evaluated via HPLC mass spectrometry (LC/MS) using these HILIC columns. Consequently, we observed multiple clusters that had not been previously reported for glutathionate (SG)-protected gold clusters (Au(SG)). Additionally, we demonstrated that AuM(SG) alloy clusters (M = Ag, Cu, or Pd) in which part of the Au in the Au(SG) cluster is replaced by a heteroelement can be synthesized, similar to the case of hydrophobic alloy clusters. It is easy to evaluate the mass distributions of hydrophilic metal clusters using this method. Thus, remarkable progress in the synthesis techniques of hydrophilic metal clusters through the use of this method is anticipated, as is the situation for hydrophobic metal clusters.

The helical chirality of a Co(II) complex with a chiral tetradentate ligand is completely inverted from Lambda to Delta by the addition of achiral NO3- anion as an external stimulus.

Mirror symmetry breaking and restoration within mmsized polymer particles in optofluidic media by pumping circularly polarised light3

A circularly polarised photon hand, l- and r-, was not a deterministic factor for the induced chiroptical sign of π-conjugated polymer aggregates. This anomaly originates from circular dichroism inversion characteristics between shorter and longer π–π* bands.

He received his Ph.D. degree in chemistry in 2001 under the supervision of Prof. Atsushi Nakajima from Keio University. Before joining Tokyo University of Science in 2008, he was employed as an assistant professor at Keio University and at the Institute for Molecular Science (IMS). His current research interests include the precise synthesis of stable and functionalized metal nanoclusters and their applications in energy and environmental materials. Yoshiki Niihori Yoshiki Niihori was born in Ibaraki, Japan, in 1986. He was a postdoctoral researcher in the Negishi group at Tokyo University of Science and is currently assistant professor at Rikkyo University. He received his B.Sc. (2009), M.Sc. (2011), and Ph.D. (2014) degrees in chemistry from Tokyo University of Science. His research interests include the development of precise synthesis methods for noble metal nanoclusters based on highperformance liquid chromatography. Kana Yoshida Kana Yoshida was born in Tokyo, Japan, in 1994. She is currently a master's degree student in the Negishi group at Tokyo University of Science. She received her B.Sc. (2017) in chemistry from Tokyo University of Science. Her research interests include the development of high-resolution separation methods for noble metal nanoclusters.

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Solid base BaO _ Al2O3 catalyst was synthesized using the solid-liquid interface reaction of Ba(OH)2 H2O in the solid phase with Al(OCH(CH3)2)3 dissolved in ethyl acetate. Water of crystallization in the barium hydroxide, Ba(OH)2 H2O was consumed by hydrolysis of Al(OCH(CH3)2)3 into Al2O3 and isopropanols. BaO _ Al2O3 catalyst synthesized by solid-liquid interface reaction of Ba(OH)2 H2O with equal mols of Al(OCH(CH3)2)3 and heat-treated at 673 K showed the highest activity among the prepared catalysts for the retro-aldol reaction of diacetone alcohol. Active BaO _ Al2O3 catalysts with various contents of BaO were obtained by heating at appropriate temperatures just below those of Ba5Al2O8 and BaAl2O4 crystallization. X-ray diffraction analysis detected no BaO phase in this solid base catalyst. Barium oxide highly dispersed in amorphous Al2O3 was prepared by the solid-liquid interface reaction. The interface reaction of metal hydroxide in the solid phase with alkoxide in the liquid phase is useful to form well-dispersed mixed metal oxides.