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From the viewpoint of the development of molecular response systems, stimulus-induced switching of multi-conformational/multi-configurational overcrowded ethylenes are interesting, whose properties could be manipulated by understanding the detailed isomerization paths. Anthraquinodi-methane (AQD) ring-flip is usually a very fast process, and thus less studied experimentally. Herein, we studied AQDs with dibenzo- and tribenzocycloheptatrienylidene units, which have large enough steric hindrance to retard the AQD ring-flip to allow determination of the Delta G(not equal) value experimentally. Their thermal isomerization was also scrutinized using the artificial force induced reaction method to elucidate the intermediates. Based on the structural unsymmetry in a newly prepared AQD, one of the isomers that undergoes a reversible conformational change via AQD ring-flip was isolated and analyzed by X-ray for the first time.

Detonation nanodiamonds (DNDs) have attracted considerable attention, in particular, in the field of nanomedicine due to their biocompatibility as well as various functionalities imparted by surfac...

Molecules with an extreme structural parameter, such as an elongated C-C bond, have attracted much attention due to their special properties, which ordinary molecules do not have. Stabilized hexaph...

In connection with our synthetic study toward the dimeric pyranonaphthoquinone antibiotics, actinorhodin (1) and β-naphthocyclinone (3), we describe herein the synthesis of a monomer, hemi-actinorh...

This study investigated the relationship between the air–water interfacial dilational viscoelasticity and foam properties in mixed anionic surfactant aqueous solutions of sodium bis(2-ethylhexyl)su...

[Ru(II)Cp((R)-Cl-Naph-PyCOOH)]PF6 ((R)-1) catalyzes the dehydrative cyclization of (E)-hept-2-ene-1,7-diol (2) to 2-vinyltetrahydro-2H-pyran (3) with a 97:3 S/R enantiomer ratio. Complex (R)-1 is i...

Bis(2-pyridylcarbonyl)aminate (bpca) coordinates to a ruthenium center with three nitrogen atoms of two pyridyl and one aminate group and the biscarbonylaminate moiety ({O-C-N-C-O}−) functions as a...

Copper nanoparticles fabricated onto reduced graphene oxide (Cu NPs/rGO) were successfully synthesized via a one-pot dimethylformamide (DMF) reduction approach with an addition of nominal water. Th...

To realize in vivo deep two-photon fluorescence microscopy (TPFM), a probe is required that can undergo two-photon excitation and emit in the optical window of tissues (650–1100 nm). In addition, t...

Pristine π-extended aromatic compounds are attractive as organic functional materials including organic semiconductors, but are difficult to synthesize in pure form because of their low solubility in common organic solvents. The precursor approach is a very useful method to synthesize pure π-extended aromatic compounds that cannot be prepared via traditional organic synthesis in flasks. In this approach, pure precursors are first prepared; these precursors are then converted quantitatively to the target molecules via a retro-Diels–Alder reaction or Strating–Zwanenburg photodecarbonylation reaction. This approach has also been used for the on-surface synthesis of the large acenes, heptacene and nonacene, under ultra-high vacuum in order to investigate their electronic properties, and is useful for the control of the packing structure of organic semiconductors in solution–processed films. The charge carrier mobilities of organic photovoltaics and organic field effect transistors have been improved using the precursor approach in combination with substituent effects. This account focuses on the synthesis and morphological control of aromatic compounds using the precursor approach in our group in the last decade.

The development of protein-polymer complexes using protein cages is garnering attention as a strategy to overcome challenges that relate to immunogenicity and protease degradation. We propose the use of thermoresponsive polymers such as poly(N-isopropylacrylamide) (PNIPAM) to form ferritin-polymer complexes through non-covalent interactions. Ferritin is observed to be released from the complexes after 1–2 days incubation at 37 °C.

Dinuclear complex, [Fe2(H2L1,Me)3](ClO4)4 (1Me, H2L1,Me = N,N′-(1,3-phenylene)bis(1-(5-methyl-1H-imidazol-4-yl)methanimine)), and octanuclear complexes, [Fe8(H2L2,H)12](ClO4)16 (2HClO4: H2L2,H = N,...

Poly(glycidyl methacrylate) (poly(GMA)) bearing pendant glycidyl groups, grafted on the surface of MgO-templated carbon (MgOC), is useful for forming strong multipoint covalent bonds with amino fun...

In the crystals of 4,7-dihalobenzo[c][1,2,5]chalcogenadiazoles, the molecules are connected by two competing secondary bonding interactions: chalcogen bond (ChB) and halogen bond (HaB). Because the strengths of ChB and HaB change according to the kind of chalcogen (E: S, Se, Te) and halogen (X: Cl, Br, l), their relative contributions in determining the crystal packing can also change. Six newly determined crystal structures as well as 3 previously reported structures can be categorized into two groups: ChB-dominant and HaB-dominant structures. HaB in which X = I is strong enough to dictate the crystal packing of compounds with E = S and Se, but not where E = Te, whereas HaB in which X = Cl or Br has little effect on ChB-dominant molecular networks in crystals. The observed changing contributions of ChB and HaB may be useful for designing new supramolecular synthons for crystal engineering.