Dr. Masaki Yoshida (Assistant Prof., School of Biological and Environmrntal Sciences) gave a presentation at the 9th Asian Conference on Coordination Chemistry (ACCC9), which was held February 19-22, 2024, in Bangkok, Thailand. ACCC is an international conference held to promote research in coordination chemistry in the Asian region. Dr. Yoshida gave an invited lecture on the development of stimuli-responsive Pt(II) complexes, especially his research on Pt(II)-loaded inorganic nanoparticles whose emission color changes from green to orange depending on humidity, and had an active discussion with researchers from many countries who attended the meeting.