Sumio Tokita

Chirality induction in a dibenzo-30-crown-10 congener promoted by an ion-pair coordinated self-assembly

We report the first example of chirality induction in a large-sized crown ether congener with bis(arylthiourea) units, which serve as an anion binding site. The phenomenon arises via an achiral ion-pair coordinated self-assembly in which intermolecular head-to-tail hydrogen bonding interactions occur between the thiourea units in the solid state.

Effective cation-assisted chirality induction using a dibenzo-diaza-30-crown-10 with bis(zinc(II) porphyrin) units

The first rationalized crown ether-bis(porphyrin) conjugate with a large ring-based conformation flexibility 1 has been synthesized; the achiral-to-chiral transformation upon complexation with chiral diamines is assisted by K(+) accommodated in the crowned moiety, and it is possible to determine the chirality of carboxylates as potassium salts.

Visualization of Four Dimensional Atomic Orbitals

ABSTRACT Four dimensional hydrogen atomic orbital was investigated by a projection method to three dimensional space. The actual outputs were drawn on a two dimensional plane. Transparent plastic block mixed with a certain photochromic compound is expected to support the above visualization.