Lithiated Cyclodextrin MOF Co-Crystallization for Porous Frameworks
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Solution Overview
Problem
The challenge lies in preparing crystalline, highly porous cyclodextrin metal organic frameworks (CD-MOFs) with alkali metal cations other than K+, Rb+, and Cs+, as attempts to incorporate other cations result in non-porous structures due to the inability to obtain stable crystalline frameworks.
Innovation Solution
A co-crystalization methodology using a combination of different cations, specifically Li+ and K+, is employed to create a metal organic framework with a coordinated network of γ-cyclodextrin and metal salt components, allowing for the formation of porous architectures with high surface areas and adsorption capacities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If alkali metal cations other than K+, Rb+, and Cs+ are used to prepare CD-MOFs, then the diversity of metal cations is improved, but the structural integrity and porosity deteriorate resulting in non-porous structures
Solution Approach 1:
The patent employs mixed-metal cation systems combining Li+ with other alkali metal cations (K+, Rb+, Cs+) to create composite CD-MOF structures. This composite approach allows Li+ to occupy specific coordination sites while other cations maintain the overall framework stability, achieving both cation diversity and structural integrity simultaneously. The mixed-metal strategy enables access to novel porous architectures that cannot be formed with single cation types.
2Quantity of substance
If co-crystalization methodology with multiple cations is used, then the adsorption capacity is improved, but the device complexity increases
Solution Approach 1:
The patent employs preliminary co-crystalization of multiple metal cations with cyclodextrin before framework formation. By pre-assembling the mixed-metal cation system with the organic linker in a controlled co-crystalization process, the method simplifies the overall synthesis while achieving high adsorption capacity. This preliminary organization of components facilitates subsequent framework assembly and enhances gas adsorption performance.
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 enables the production of CD-MOFs with enhanced CO2 and H2 adsorption capacities, surpassing previous sorption capacities, and maintains structural integrity and porosity, overcoming the limitations of using only K+, Rb+, and Cs+ ions.
Implementation Method 1
a coordinated network of repeating units extending in three dimensions, wherein the repeating unit comprises a cyclodextrin and a metal salt component
Implementation Method 2
enhanced CO2 and H2 adsorption capacities, surpassing previous sorption capacities
Data Source
AI summary
Disclosed herein are lithiated cyclodextrin metal organic frameworks and method of making and using the same. A metal organic framework comprising a coordinated network of repeating units extending in three dimensions, wherein the repeating unit comprises a cyclodextrin, a first coordinating metal cation, and a second coordinating metal cation.