Phenylethynylnaphthalene Dyes for Activation-Free Biomolecule Detection
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Solution Overview
Problem
There is a need for water-soluble dyes and biomarkers that allow for visual or fluorescent detection of biomolecules without prior illumination or chemical/enzymatic activation, offering intense color or fluorescence in various wavelengths, and addressing the limitations of existing cyanine dyes like Cy2 in chemical and life sciences.
Innovation Solution
Development of phenylethynylnaphthalene dyes with specific structural features, such as a maximum excitation wavelength ranging from about 400 nm to 420 nm and emission wavelength from about 520 nm to 540 nm, enabling intense fluorescence and visual detection of biomolecules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If triarylmethane dyes or phenolic dyes are used, then textile fibers can be colored, but the colorfastness to washing and crocking is insufficient
Solution Approach 1:
The patent modifies the chemical structure of conventional dyes by introducing specific substituents (sulfonate groups, hydroxyl groups, and aromatic acid groups) at defined positions in the naphthalene ring system. This structural parameter change enables the dye to form stable covalent bonds with cellulose fibers, dramatically improving colorfastness to washing and crocking while maintaining good color yield.
Solution Approach 2:
The patent creates a composite dye structure combining naphthalene core with multiple functional groups (sulfonate, hydroxyl, carboxyl) that work synergistically. The naphthalene chromophore provides coloration, while the functional groups enable both fiber reactivity and metal complexation, resulting in a composite molecular structure that achieves superior colorfastness.
2Quantity of substance
If reactive dyes with high reactivity toward cellulose are used, then color yield is improved, but the dyes lack affinity for wool and silk fibers
Solution Approach 1:
The patent designs a universal dye molecule that can interact with multiple fiber types through different mechanisms. The naphthalene core with hydroxyl and carboxyl groups provides hydrogen bonding capability for wool and silk, while the sulfonate groups and reactive clusters provide covalent bonding for cellulose. This multi-functional design enables the same dye to achieve good color yield on all three fiber types.
Solution Approach 2:
The patent positions different functional groups at specific locations on the naphthalene ring system. The hydroxyl and carboxyl groups are positioned to interact with protein fibers (wool, silk) through hydrogen bonding, while sulfonate groups are positioned for ionic and covalent interactions with cellulose. This spatial differentiation of functional properties enables selective interaction with different fiber types.
3Ease of manufacture
If conventional dyeing processes are used, then the dyeing process is simple, but the colorfastness to perspiration and rubbing is not satisfactory
Solution Approach 1:
The patent incorporates metal complexing groups directly into the dye molecule structure. The dye molecules self-assemble metal complexes with copper, nickel, or chromium ions during the dyeing process without requiring separate metalation steps. This self-service capability provides enhanced colorfastness to perspiration and rubbing while maintaining process simplicity, as the metal complexation occurs automatically during conventional dyeing conditions.
Data Source
Figure 1
AI summary
Compounds useful as fluorescent or colored dyes are disclosed. The compounds have the following structure (I), including salts thereof, wherein R1a, R1b, R1c, R1d, R1e, R1f, R2a, R2b, R2c, R2d, R2e, R2f, R2g, R2h, R2i, R2j, x and y are as defined herein. Methods associated with preparation and use of such compounds are also provided.