Non-fluorescent rhodamines
US11560365B2 · kind B2 · utility
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5Claims
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Key dates
| Filing date | Mar 4, 2019 |
| Grant date | Jan 24, 2023 |
| Priority date | — |
| Expiry date | Mar 7, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2333/90245
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.