This report describes a helicity-selective photoreaction of single-walled carbon nanotubes (SWNTs) with disulfide in the presence of oxygen. The SWNTs were characterized using absorption, photoluminescence (PL), Raman, and X-ray photoelectron spectroscopy, scanning electron microscopy, and current-voltage (I-V) measurements. Results showed remarkable helicity-selective (metallic SWNTs/semiconducting SWNTs and diameter) functionalization of SWNTs. The reaction rate decreases in the order of metallic SWNTs > semiconducting SWNTs and small-diameter SWNTs > large-diameter SWNTs. Control experiments conducted under various experimental conditions and ESR and femtosecond laser flash photolysis measurements revealed that the helicity-selective reaction proceeds via a photoinduced electron transfer reaction. The PL and I-V measurements showed that the photoreaction is effective not only to control SWNT conductivity but also for the band gap modulation of semiconducting SWNTs.

Treatment of 2-phenylpyridines (or their analogs) with a 9-bicycloboranonane dimer (9-BBN dimer) in the presence of a catalytic amount of a commercially available iron salt, FeBr, gave ortho-borylated products in moderate to excellent yields with good functional group tolerance. The reaction proceeded in good yield, even in gram-scale, and also occurred at the C-H bond of heteroaromatic compounds. The cost of the C-H borylation is dramatically lower than that of a previously reported similar palladium-catalyzed reaction. The products exhibit an intramolecular B-N Lewis acid-base interaction and fluoresce in both solution and solid states due to their electron push-pull structures.

We found that meta-selective C–H borylation of aromatic compounds was accelerated when using urea moiety-containing bipyridine-type ligands unlike in cases involving a bipyridine-type ligand without the urea moiety. The acceleration was due to the recognition and capture of the aromatic substrates by the urea moiety of the ligand by hydrogen bonding. The acceleration was further enhanced by modifying the electronic and steric properties of the ligand. The functional group and substrate specificities were also observed using the urea moiety-containing ligands.

Multicolor emissive materials consisting of as ingle luminophore,aLewis acid, and their complex were developed. The emission colors can be tuned by changing the concentration of the solution and the ratio of mixed solvents.V arious emission colors in the solid state were observed when the complexes were added to polymers in different amounts.T he color change is due to equilibrium disruption between the single luminophore,t he Lewis acid, and the complex thereof. White emission was observed by appropriately controlling the equilibrium by changing the amount of the complex in the polymer.Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

The transmetalation of the digold(I) complex [Au 2 Cl 2 (dcpm)] ( 1 ) (dcpm = bis(dicyclohexylphosphino)methane) with oligophenylene diboronic acids gave the triangular macrocyclic complexes [Au 2 (C 6 H 4 ) x (dcpm)] 3 ( x = 3, 4, 5) with yields of over 70%. On the other hand, when the other digold(I) complex [Au 2 Cl 2 (dppm)] ( 1′ ) (dppm = bis(diphenylphosphino)methane) was used, only a negligible amount of the triangular complex was obtained. The control experiments revealed that the dcpm ligand accelerated an intermolecular Au(I)–C σ-bond-exchange reaction and that this high reversibility is the origin of the selective formation of the triangular complexes. Structural analyses and theoretical calculations indicate that the dcpm ligand increases the electrophilicity of the Au atom in the complex, thus facilitating the exchange reaction, although the cyclohexyl group is an electron-donating group. Furthermore, the oxidative chlorination of the macrocyclic gold complexes afforded a series of [ n ]cycloparaphenylenes ( n = 9, 12, 15) in 78–88% isolated yields. The reorganization of two different macrocyclic Au complexes gave a mixture of macrocyclic complexes incorporating different oligophenylene linkers, from which a mixture of [ n ]cycloparaphenylenes with various numbers of phenylene units was obtained in good yields.

An equimolar mixture of diarylplatinum(II) complexes, [PtPh 2 (cod)] and [Pt(C 6 H 4 F) 2 (cod)] (cod: 1,5-cyclooctadiene), is turned into an unsymmetrical diaryl complex, [PtPh(C 6 H 4 F)-(cod)], upon heating at 50°C via intermolecular aryl ligand exchange. The reaction occurs reversibly to afford an equilibrated mixture of the complexes.Intermolecular transfer of alkyl, allyl, and aryl ligands of organometallic compounds of nontransition metals to transitionmetal complexes is a typical transmetalation reaction. They are of interest as the common synthetic reactions of organotransition-metal complexes as well as of the crucial step of synthetic organic reactions and olefin polymerization reactions catalyzed by transition-metal complexes.

The synthesis of silafluorene derivatives from aminobiphenyl compounds and dihydrosilanes via a double sila-Friedel–Crafts reaction using a borane catalyst has been achieved.

We have synthesized chiral aza-boraspirobifluorenes and evaluated their structural and photophysical properties.