MOFs with Mixed Metal Ions and Functional Ligands
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Solution Overview
Problem
Synthesizing metal-organic frameworks (MOFs) with multiple types of differently functionalized organic linking ligands and varying metal atoms is challenging due to the complexity of achieving optimal structural tunability for applications like gas separation, storage, and catalysis.
Innovation Solution
The development of MOFs comprising a plurality of secondary building units (SBUs) linked by multiple types of organic linking ligands, where the ratio of metal ions and functional groups can be adjusted to modify material properties, allowing for topologically uniform structures with diverse functional groups and metal compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple types of differently functionalized organic linking ligands and varying metal atoms are used to achieve structural tunability, then the material properties can be optimized for specific applications, but the synthesis complexity increases significantly
Solution Approach 1:
The MOF structure is segmented into distinct secondary building units (SBUs) with specific metal ions (e.g., Cu, Zn, Co) and organic linking ligands with different functional groups (e.g., -NH2, -OH, -COOH). This segmentation allows independent optimization of each component's properties while maintaining overall framework integrity, enabling tailored structural tunability without proportionally increasing synthesis complexity.
Solution Approach 2:
Different functional groups are locally introduced at specific positions within the MOF structure through selective use of functionalized organic ligands. This local quality approach allows optimization of specific regions for particular functions (e.g., gas separation, catalysis) while keeping the overall synthesis process manageable by focusing modifications at key locations rather than throughout the entire structure.
2Adaptability or versatility
If the ratio of metal ions and functional groups is adjusted to modify material properties, then the performance for gas separation, storage, and catalysis is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent systematically varies parameters such as the ratio of metal ions (Cu:Zn:Co), the type and ratio of organic linking ligands, and functional group concentrations to optimize MOF performance. By establishing parameter ranges and relationships (e.g., specific metal ratios for gas separation vs. catalysis), the patent reduces the precision burden while maintaining performance optimization capability.
Solution Approach 2:
The MOF design incorporates multiple functional groups (-NH2, -OH, -COOH) and varying metal ions within a single framework structure, enabling the material to perform multiple functions (gas separation, storage, catalysis) simultaneously. This multi-functionality reduces the need for precise ratio control for each individual application, as the framework can adapt to different functions through its inherent compositional flexibility.
Data Source
AI summary
The disclosure provides for metal organic frameworks (MOFs) which comprise a plurality of SBUs comprising different metals or metal ions and/or a plurality of organic linking moieties comprising different functional groups.