公开(公告)号：US11560365B2

公开(公告)日：2023-01-24

申请号：US16977437

申请日：2019-03-04

Applicant: THE UNIVERSITY OF TOKYO

Inventor： Kenjiro Hanaoka ,  Yasuteru Urano ,  Takayuki Ikeno

IPC: C07D311/82 ,  C09B11/24

Abstract: A novel non-fluorescent rhodamine dye forms a twisted intramolecular charge transfer state. A substituent that causes steric hindrance is introduced at an ortho position of a dimethylamino group on the xanthene ring of tetramethylrhodamine, which is a general rhodamine that exhibits strong fluorescence, and a certain amount of twist is imparted in a ground state. As a result, the formation of the twisted intramolecular charge transfer state is promoted in the excited state and non-fluorescence is exhibited.