Amine-Substituted Tricyclic Fluorescent Dyes for Large Stokes Shift
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Solution Overview
Problem
Current fluorescent dyes face challenges with background fluorescence, non-specific binding, and instability under laser radiation due to small Stokes shifts, making it difficult to separate fluorescence signals from scattered excitation light and distinguishing multiple analytes with the same light source.
Innovation Solution
Development of polycyclic compounds with a large Stokes shift (>60 nm) and high fluorescence efficiency, characterized by specific structural formulas and reaction processes, allowing for the preparation of dyes that can be used for qualitative or quantitative analyte determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional fluorescent dyes are used, then fluorescence detection is possible, but the Stokes shift is small (about 30 nm) making it difficult to separate fluorescence signal from scattered excitation light
Solution Approach 1:
The patent modifies molecular parameters by introducing specific substituents (amine groups at central carbon, electron-donating/withdrawing groups) to change the electronic structure of the fluorophore, thereby increasing the Stokes shift from 30 nm to >60 nm and enabling better signal separation
2Measurement precision
If dyes with large Stokes shift are used to improve signal separation, then fluorescence efficiency is reduced
Solution Approach 1:
The patent applies local quality by placing specific functional groups (amine at central carbon, electron-donating groups at positions 2/7, electron-withdrawing groups at positions 3/6) in specific locations on the xanthene ring system, creating localized electronic effects that simultaneously increase Stokes shift and maintain high fluorescence quantum yield
Solution Approach 2:
The patent creates composite molecular structures by combining the xanthene core with multiple different substituents (amine groups, electron-donating groups, electron-withdrawing groups) to achieve a composite fluorophore that exhibits both large Stokes shift and high fluorescence efficiency
3Adaptability or versatility
If conventional dyes are used for detecting multiple analytes, then non-specific binding and background fluorescence occur
Solution Approach 1:
The patent changes chemical parameters by introducing amine substituents that can form specific interactions (hydrogen bonding, coordination) with different analytes, enabling selective detection while reducing non-specific binding through tailored molecular recognition properties
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
These compounds provide efficient fluorescence with minimal temperature and environmental dependence, enabling clear separation of fluorescence signals and effective analyte differentiation, reducing interference from disturbing substances in samples.
Implementation Method 1
it has hitherto not been possible satisfactorily to solve problems associated with background fluorescence
Implementation Method 2
the small shift of the fluorescence band relative to the long-wave absorption band, which is characteristic of most dyes
Data Source
AI summary
The present invention relates to polycyclic compounds of the general formula (I) which are distinguished by an amine substituent NR6R7 on the central carbon atom of the chromophore, to processes for their preparation, and to the use thereof for the determination of analytes.