Presentation Information
[23p-P02-19]Stable immobilization of photochromic molecules using confined spaces of Supermicroporous silica
〇Kosei Hayashi1, Hiroto Watanabe2, Hiroaki Imai2 (1.TIRI, 2.Keio Univ.)
Keywords:
porous silicas,photochromic molecules,stabilization
When photochromic molecules were incorporated into silica pores of about 1 nm in diameter, ring-opening occurred spontaneously due to the interaction with silanol groups. We confirmed that photochromic molecules are fixed and stabilized in the molecular structure by this interaction. In pores with a size close to the molecular size, the rotation of the molecule is sterically restricted. As a result, the molecules are firmly fixed and not ring-closing. Therefore, the ring-opening structure in the pore is stable even under blue light irradiation and basic conditions. In addition, chromism in response to external pH is observed, which allows for the development of new functionalities.