Hideyuki Nakano
Muroran Institute of Technology, Japan
Title: Amorphous molecular materials with photomechanical and mechanochromic functions
Biography
Biography: Hideyuki Nakano
Abstract
Organic low molecular-mass materials usually exist in their crystalline states below their melting temperatures. However, suitable chemical modifi cation of molecules allows to provide the organic low molecular-mass materials that readily form stable amorphous glasses at ambient atmosphere. We have been performing studies of such materials, we refer to as "amorphous molecular materials". We have designed and synthesized a variety of amorphous molecular materials and investigated their structures, properties, and applications to photo- and electro-active deviced. In the present talk, our recent results regarding amorphous molecular materials with unique functions will be introduced. Recently, photomechanical behaviors observed for organic photochromic materials have been attracting attention. We have designed and synthesized a variety of amorphous molecular materials that exhibit photochromism. And we have found that azobenzene-based amorphous molecular materials exhibited several photomechanical behaviors, such asb photoinduced surface relief grating formation of their films, photoinduced bending motions of their microfi bers, the movement of the fragments of these molecular glasses induced by angled irradiation from their bottom, and so on. As another topic, the phenomena of reversible changes in fluorescent color of the emitting solid materials induced by mechanical stress such as grinding, namely mechanochromic luminescence, have recently received a great deal of attention. We have designed and synthesized emitting amorphous molecular materials and found that amorphous molecular materials based on diarylaminobenzaldehyde exhibited mechanochromic emission.