Iridium Complexes for Aqueous Electrochemiluminescence
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Solution Overview
Problem
Current electrochemiluminescence-based detection methods, particularly for in vitro diagnostics, face limitations in sensitivity and are often restricted to organic solvents, making them unsuitable for aqueous biological samples.
Innovation Solution
Development of iridium-based Ir(III) luminescent complexes and their conjugates with affinity binding agents for use in electrochemiluminescence reactions within aqueous solutions, enhancing sensitivity and compatibility with biological samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If water-soluble ruthenium complexes are used for ECL-based detection, then the method is suitable for aqueous biological samples, but the sensitivity is limited
Solution Approach 1:
The patent changes the metal center parameter from ruthenium to iridium, which fundamentally alters the electrochemiluminescence properties. Iridium-based complexes exhibit higher quantum efficiency and brighter emission in aqueous media compared to ruthenium complexes, thereby improving detection sensitivity while maintaining compatibility with biological samples
Solution Approach 2:
The patent employs composite structures by combining iridium complexes with various ligands (such as cyclometalating ligands and picolinate ligands) to create optimized ECL labels. These composite materials leverage the synergistic effects of different components to achieve enhanced luminescence efficiency and stability in aqueous environments
2Use of energy by moving object
If organic light emitting device compounds are used, then high luminescence efficiency is achieved in organic solvents, but they are unsuitable for aqueous biological sample detection
Solution Approach 1:
The patent introduces hydrophilic groups (such as carboxylic acid, hydroxyl, amino, or sugar moieties) at specific positions on the ligand structures to enhance water solubility. This local modification approach maintains the core luminescent properties of the iridium complex while adding aqueous compatibility, allowing the material to function in biological sample detection
Solution Approach 2:
The patent modifies the chemical parameters of the complex by selecting specific ligands with appropriate hydrophilicity and electronic properties. By adjusting ligand types (e.g., using phenanthroline derivatives with hydrophilic substituents), the complex achieves both high luminescence efficiency and solubility in aqueous buffers required for biological applications
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
The iridium-based complexes demonstrate high electrochemiluminescence efficiency in aqueous systems, surpassing many labels that perform well in organic solvents, enabling more sensitive and effective detection methods for biological analytes.
Implementation Method 1
Electrogenerated chemiluminescence (also called electrochemiluminescence and abbreviated ECL) is the process whereby species generated at electrodes undergo high-energy electron-transfer reactions to form excited states that emit light.
Data Source
AI summary
The present invention relates to novel iridium-based Ir(III) luminescent complexes, conjugates comprising these complexes as a label and their application, e.g. in the electrochemiluminescence based detection of an analyte.