Yumi Yakiyama

Two sumanene-based porous coordination networks were successfully prepared by the complexation of hexapyridylsumanene with Zn(NO₃)₂·6H₂O or Cd(NO₃)₂·4H₂O. X-ray single crystal analysis unambiguously revealed that the curved structure of the central sumanene skeleton of the ligand resulted in the formation of a large confined space with a small aperture size. In the Zn²⁺ network, the beltlike trimer units were connected

A tripyridyl multi-interactive ligand TPHAP is prepared by a one-pot reaction on a gram scale. Network formation of Co(ii) with TPHAP(-) gave kinetic and thermally more stable products. The kinetic network showed an unprecedented dynamic network transformation on the crystal surface by a ligand exchange reaction.

A large dipole moment of 1,1-difluorosumanene realized a 120° in-plane pendulum motion in the stacking columns at above 380 K. This dynamic motion in the solid state enabled anisotropic dielectric relaxation induced by the external electric field.

A new curved π-conjugated molecule 1-fluorosumanene (<b>1</b>) was designed and synthesized that possesses one fluorine atom on the benzylic carbon of sumanene. This compound can exhibit bowl inversion in solution, leading to the formation of two diastereomers, <b>1</b>_{<b><i>endo</i></b>} and <b>1</b>_{<b><i>exo</i></b>}, with different dipole moments. Experimental and theoretical investigation revealed an energetical relationship among <b>1</b>_{<b><i>exo</i></b>}, <b>

A series of co-crystals of 1,1-difluorosumanene (F2-Sum) and sumanene (Sum) were obtained. The co-crystallization successfully tuned their structural and physical properties, especially the dielectric response, without any chemical modifications. X-ray analyses and theoretical calculations revealed the reduction of intermolecular interaction energy due to the presence of F2-Sum.

Abstract Complex formation of quaterimidazole with Fe II , Co II , and Ni II yielded dinuclear triple helicates in the solution state by the self‐assembling ability of the ligand based on the strong chelating coordination bonds. Crystallization of the Co II complex from aqueous solution afforded the Co III complex with a triple‐helical structure. X‐ray crystal structure analyses revealed that the helicates are linked through N–H ··· X hydrogen bonds with counteranions and solvent molecules to fo

A compact, low-power microchip laser system is utilized for pulse laser ablation in liquids, and the impact of solution viscosity on the efficiency of gold nanoparticle ablation in PVP solutions is explored.

Interconvertible molecular crystals 1_close and 1_open composed of 4-pyridyl-1,3-indanedione dimer 1 were selectively obtained. Thermal removal of solvent molecules in 1_open afforded 1_close. Further dipping of 1_close in a specific solvent reproduced 1_open. No crystallinity loss was observed even though both processes involved a drastic change of molecular packing arrangements.

Abstract Organic crystalline dielectric materials are attractive target in the field of materials chemistry. In their designing strategy, the molecular motion induced by the external dielectric field is required to maximize the polarization effect in the materials to realize a large dielectric constant. Especially, the molecular motion of curved-π aromatics such as C 60 and their supramolecular complexes are the known to show characteristic smoothness in the solid state. In this context, we focu

Ammonium and sodium salts (ion pairs) of a multi-interactive tri(4-pyridyl)hexaazaphenalenyl anion (TPHAP(-)) showed completely different ion-conductive properties depending on the crystal structure. TPHAP columnar crystals showed a high conductivity of 10(-3) S cm(-1) while retaining their structures even under humid conditions, whereas TPHAP dimer crystals exhibited a conductivity of ∼10(-5) S cm(-1) with crystallinity deterioration. The main unit structures induced by multi-interactivity real

Ru( ii ) complexes with sumanene-functionalised terpyridine ligands exhibited dual emission via the TICT mechanism due to the relatively easy rotation around the sumanene–terpyridine bond axis. They also showed selective Li + sensing ability.

We have observed the generation of sumanenylidene (2), a divalent, neutral-carbon species at the benzylic position of sumanene (1). We also clarified both experimentally and theoretically that the ground state of compound 2 was a triplet state and that its singlet-triplet energy gap (ΔE_ST ) was similar to that in fluorenylidene. The curved structure of compound 2 led to slightly better spin delocalization over the two adjacent aromatic rings than in planar systems, because of the unpa

Crystalline powders self-assembled from interactive discrete molecules reversibly transformed from a porous structure to a 2D one with a nanometer-thick H2O layer by hydration/dehydration. Multi-point weak intermolecular interactions contributed to maintenance of each phase. This structure transformation induced a humidity-dependent ion conductivity change from insulator to 3.4 × 10(-3) S cm(-1).