The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 24, 2023
Filed:
Mar. 04, 2019
Applicant:
The University of Tokyo, Tokyo, JP;
Inventors:
Assignee:
THE UNIVERSITY OF TOKYO, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D 311/82 (2006.01); C09B 11/24 (2006.01);
U.S. Cl.
CPC ...
C07D 311/82 (2013.01); C09B 11/24 (2013.01);
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.