Cyclometalated Iridium Complex Production via Oxalic Acid Coordination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing methods for producing cyclometalated iridium complexes require excessive amounts of expensive aromatic heterocyclic bidentate ligands, leading to high costs and low yields, with significant production of undesired by-products such as halogen-crosslinked iridium dimers and side reactions.
Innovation Solution
A method involving the use of an organoiridium compound with a substructure represented by General Formula (1), where oxalic acid is coordinated to iridium, reduces the need for aromatic heterocyclic bidentate ligands and avoids the formation of halogen-crosslinked iridium dimers, allowing for the production of cyclometalated iridium complexes with high yield and purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an aromatic heterocyclic bidentate ligand is used in a large amount to produce cyclometalated iridium complex, then the yield of desired product is improved, but the production cost increases significantly
Solution Approach 1:
The invention changes the chemical structure parameter of the iridium raw material from conventional compounds to organoiridium compounds with specific substructures (Formula 1). This structural parameter change enables the reaction to proceed with much lower ligand amounts (1-5 equivalents instead of 10+ equivalents), thereby improving productivity while reducing the quantity of expensive ligand required.
2Productivity
If an aromatic heterocyclic bidentate ligand is used in a large amount to produce cyclometalated iridium complex, then the yield of desired product is improved, but the purity of product decreases due to by-product formation
Solution Approach 1:
The invention changes the chemical structure parameter of the iridium raw material to organoiridium compounds with specific substructures (Formula 1). This parameter change fundamentally alters the reaction pathway, enabling high yield (70-90%) to be achieved simultaneously with high purity by preventing halogen-crosslinked dimer formation, thus resolving the contradiction between productivity and manufacturing precision.
3Ease of manufacture
If conventional iridium raw materials are used, then the production process is simpler, but the yield and purity of cyclometalated iridium complex are poor
Solution Approach 1:
The invention changes the chemical structure parameter of the iridium raw material to organoiridium compounds with specific substructures (Formula 1). Although this requires additional synthesis steps for the raw material, the actual cyclometalation reaction becomes simpler and more efficient, achieving 70-90% yield with high purity, thus improving overall productivity despite the preparatory complexity.
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
This approach significantly reduces the cost of cyclometalated iridium complex production by minimizing the use of expensive ligands and eliminates the production of unwanted by-products, resulting in a high-purity product suitable for use in organic electroluminescent devices and other applications.
Implementation Method 1
reacting a cyclometalated iridium complex raw material including an organoiridium compound with an aromatic heterocyclic bidentate ligand capable of forming an iridium-carbon bond and an iridium-nitrogen bond
Data Source
AI summary
The present invention provides a method for producing a cyclometalated iridium complex, the method including producing a cyclometalated iridium complex by reacting a cyclometalated iridium complex raw material including an organoiridium compound with an aromatic heterocyclic bidentate ligand capable of forming an iridium-carbon bond and an iridium-nitrogen bond, and using as the raw material an organoiridium compound including a substructure represented by the following General Formula (1). The present invention is capable of producing a cyclometalated iridium complex with a high yield without by-production of a halogen-crosslinked iridium dimer.(in General Formula (1), Ir represents an iridium atom, and O represents an oxygen atom).