糖心视频

Aoyama Gakuin University paper by Assistant Professor Wataru Kashiwara (Department College of Science and Engineering Department of Chemistry and Biological Science, Faculty of Science and Engineering, affiliated with the Laser Photochemistry Laboratory (Professor Tadashi Suzuki)) and Shota Watanabe (2nd year Master's student Chemistry Course School Graduate School of Science and Engineering and Engineering) of our university has been featured on the cover of the American Chemical Society's academic journal, "The Journal of Physical Chemistry."
This academic journal is a renowned publication that was founded in 1896 and is a pioneer in the field of physical chemistry.

The title of the paper is "Effects of Two Electron-Donating and/or Withdrawing Substituents on Two-Photon Absorption for Diphenylacetylene Derivatives".

This research is the result of a collaborative effort between Professor Ryo Takeuchi (College of Science and Engineering Department of Chemistry and Biological Science Science and Engineering), a specialist in organic synthesis, and Associate Professor Tasuku Isozaki of Obirin University.
Furthermore, we have received support for the Research Institute project "Electronically Excited States of Functional Molecular Skeleton Diaryl Polyynes" (2013-2014).


When a strong light source, such as a laser, is shone on a material, one of the molecules that make up the material may absorb two photons (the smallest unit of light energy) at once (Note 1). This is called simultaneous two-photon absorption, and materials that exhibit this phenomenon are called two-photon absorbing materials.
Two-photon absorption materials are expected to have applications in recording materials (memory), microstructure formation (micromachines), and drugs (sensitizers) in photodynamic therapy for cancer treatment. Research is actively being conducted on the mechanism of two-photon absorption and what kind of molecular design is needed to strongly induce it.

The paper describes the synthesis of molecules in which two substituents (Note 2) are introduced to diphenylacetylene, a molecular framework commonly used as a two-photon absorption material, and reports on the two-photon absorption properties of these molecules.
We discussed various factors to determine what kind of electron-donating and electron-withdrawing groups should be placed where in the skeletal molecule to efficiently induce two-photon absorption.
Its content was highly regarded and was selected for the cover of an academic journal.

(Note 1) Photon: Light can be thought of as a particle of energy, and its energy is inversely proportional to its wavelength. As light becomes bluer and more ultraviolet, the energy of a single photon gradually increases.

(Note 2) A substituent refers to an atom or group of atoms introduced into the skeletal molecule. These substituents have properties that either pull electrons from the skeletal molecule (electron-withdrawing group) or, conversely, push electrons from themselves into the molecule (electron-donating group).


Assistant Professor Kashiwara Ko has received the "Encouragement Award" from the "Japanese Society for Photomedicine and Photobiology."

• News about the 45th Annual Encouragement Award of the Japanese Society for Photomedicine and Photobiology