Transferring Chiral Information between Objects with different dimensions

日時　2023年12月11日　（月）　15：00～16：30
場所　広島大学放射光科学研究センター　2階　セミナー室
講師　Reiko Oda
(Institute of Chemistry and Biology of Membranes and Nano-objects(CNRS), WPI-AIMR(Tohoku University))

Chirality can express its properties over a large spatiotemporal range, and the notion of mirror image non-superposability is omnipresent in the organization of matter and the formation of new structural edifices. The emergence of chiral fields at the macro scale, the light-matter interaction and more particularly in the biomolecular recognition with the origin of the homochirality of living organisms have known a tremendous interest.

The static and dynamical chirality can be transmitted between various media and size scales, from spinning elementary particles or chiral molecules to mesoscopic and macroscopic structures through electromagnetic fields or emergent spin structures. These transmission processes can be expressed as spin-orbital angular momentum transfer among electrons, photons, and phonons, and in the intra- inter-molecular or sterical interaction. The transmission mechanism of chirality information is extremely complex and never ceases to fascinate scientists. When investigating the systems spanning the large size range, hierarchical nanostructures based on molecular assemblies represent promising structures allowing us to fill in the gap that is difficult to assess from both top-down and bottom-up approaches.

For several decades, based on the molecular assembly, we have developed helical nanostructures with controlled sizes of the order of 10-100 nm and handedness, which have shown very promising properties not only as fundamentally interesting shaped objects with intriguing properties but also as helical platforms transferring the chiral information between very small to large objects and vice-versa, from electrons, atoms, molecules or large polymers and even nanoparticles. Through such interaction, we have shown exciting examples of their use in chiral induction, amplification, crystallization, reaction, and chiral recognition.

(1) R. Oda, I. Huc, M. Schmutz, S. Candau and F. MacKintosh, Nature, 1999, 399, 566-569.: Y. Okazaki, T. Buffeteau, E. Siurdyban, D. Talaga, N. Ryu, R. Yagi, E. Pouget, M. Takafuji, H. Ihara and R. Oda, Nano Letters, 2016, 16, 6411-6415.
(2) P. Liu, Y. Battie, T. Kimura, Y. Okazaki, P. Pranee, H. Wang, E. Pouget, S. Nlate, T. Sagawa and R. Oda, Nano Letters, 2023, 23, 3174-3180.: N. Ryu, Y. Okazaki, K. Hirai, M. Takafuji, S. Nagaoka, E. Pouget, H. Ihara and R. Oda, Chemical Communications, 2016, 52, 5800-5803.

問合せ先　松尾光一（放射光科学研究センター）