Ichiro Hisaki

Learn More
Steroidal bile acids and their derivatives exhibit characteristic inclusion behaviors in the crystalline state. Their crystals present varied assemblies due to asymmetric molecular structures, which relate to supramolecular properties through cooperative weak interactions. An overview indicates that the steroidal assemblies lie in an intermediate position(More)
A novel molecular arrangement of anthracene moieties and the corresponding rare solid-state excimer emission is obtained by utilization of a ternary system. The system consists of ammonium anthracene disulfonate and adducts, and shows the modulation of the solid-state emission mode depending on the adducts. The adducts act as molecular information sources(More)
Steroidal bile acids and over 50 of their derivatives serve as the hosts of inclusion crystals. These hosts each exhibit their own characteristic inclusion behaviors, which have been explored through more than 300 crystallographic data. The molecules with three-axial chirality combine in asymmetric fashion to form diverse assemblies, which have(More)
Achiral molecules can form aggregates with chirality. This depends on the relative position of the molecules, in other words, the tilt of the molecules (so-called supramolecular tilt chirality). In this paper, we describe supramolecular chirality appearing in a 2(1) column composed of symmetrical benzene molecules, which is formed in the host cavity of(More)
The supramolecular chirality of 1D ladder-type hydrogen-bond networks composed of primary ammonium carboxylates was determined based on topological considerations. Chirality in such networks is based on the absolute configuration of the primary ammonium cation, which arises from discrimination between the two oxygen atoms of the carboxylate anion. The(More)
Chirality-induced aromatic π-electronic macrocycles, porphyrin and corroles, were synthesized through doubly inner N-methylation through multistep and one-pot reactions, respectively. The exact structures of doubly N-methylated porphyrin and corroles were revealed by single-crystal synchrotron X-ray analysis, exhibiting two N-methyl groups located on(More)
To develop a novel pi-conjugated molecule-based supramolecular assembly, we designed and synthesized trisdehydrotribenzo[12]annulene ([12]DBA) derivative 2 with three carboxyl groups at the periphery. Recrystallization of 2 from DMSO gave a crystal of the solvate 23 DMSO. Crystallographic analysis revealed, to our surprise, that a face-to-face pi-stacked(More)