Hexanuclear Metal Organic Frameworks for Gas Separation
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Solution Overview
Problem
The challenge lies in predicting and synthesizing metal organic frameworks (MOFs) with specific structures for targeted applications, particularly in gas separation and storage, due to the complexity of assembling highly connected molecular building blocks and controlling their topology.
Innovation Solution
The approach involves using rare earth metal ions and non-centrosymmetric hetero-functional ligands to create hexanuclear clusters, which are then bridged with fluoro and tetrazolate functionalized organic ligands to form 12-connected MOFs with face-centered cubic topology, facilitated by the use of fluorinated ligands and modulators like 2-fluorobenzoic acid to control the directionality and dimensionality of the framework.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If highly connected molecular building blocks are used to construct MOFs, then the framework connectivity and structural complexity increase, but the difficulty of predicting and controlling topology increases
Solution Approach 1:
The patent segments the complex MOF construction process into controlled assembly steps using modular building blocks. By dividing the framework into discrete metal clusters and organic linkers that assemble predictably, the patent reduces topology prediction difficulty while maintaining high framework connectivity.
Solution Approach 2:
The patent employs preliminary action by pre-designing and pre-characterizing the molecular building blocks with specific geometries and coordination preferences before assembly. This preliminary characterization of metal clusters and linkers enables predictable topology control during the self-assembly process.
2Manufacturing precision
If rational construction methods are used to control MOF assembly, then the structural precision and functionality increase, but the understanding and control of assembly mechanisms remain in infancy
Solution Approach 1:
The patent applies parameter changes by systematically varying synthesis conditions such as temperature, pH, solvent composition, and reactant ratios to control the assembly process. These parameter adjustments enable precise structural control while gradually elucidating the assembly mechanisms through observable changes in product formation.
Solution Approach 2:
The patent incorporates feedback mechanisms through in-situ characterization techniques and post-synthesis analysis to monitor assembly progress and adjust conditions accordingly. This feedback loop enables refinement of assembly control while building understanding of the mechanisms involved.
3Adaptability or versatility
If made-to-order MOFs are designed for specific applications, then the application performance increases, but the stability and reliability of the materials decrease
Solution Approach 1:
The patent employs composite materials by combining robust metal clusters (such as Zn4O, Cu6S4, or Zr6O4) with stable organic linkers to create hybrid MOF structures. This composite approach maintains high application-specific functionality while ensuring thermal and chemical stability through the inherent robustness of both inorganic and organic components.
Solution Approach 2:
The patent applies local quality by optimizing specific regions of the MOF structure for particular functions while maintaining overall stability. Functional groups, pore sizes, and surface properties are locally tailored for application performance without compromising the global structural integrity and stability of the framework.
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 method enables the rational construction of MOFs with high localized charge density, enhancing CO2 sorption energetics and selectivity, and demonstrates the potential for efficient gas separation and storage by tuning the framework's structure and porosity.
Implementation Method 1
Metal organic frameworks (MOFs) are considered a promising class of porous materials that are positioned to address many enduring societal challenges pertaining to energy and environmental sustainability
Implementation Method 2
The inherent structural modularity (e.g., use of different metals, extensive library of organic building blocks with various shapes and dimensions, postsynthetic modifications, etc.) and exceptional controlled porosity place MOFs as ideal candidate materials for various relevant applications, such as gas separation, gas storage
Data Source
AI summary
A molecular building block composition can include a metal ion component; and a ligand component including a core including at least one functional group associated with the metal ion component and the core.