Overview
Organic framework monomers are specialized organic compounds designed to polymerize or coordinate with metal ions, forming highly ordered porous materials like MOFs and COFs. These monomers typically contain two or more reactive functional groups (e.g., carboxylates, amines) spaced to enable controlled framework growth. Their modularity allows tailored porosity and functionality, making them indispensable in designing advanced materials for industrial and research applications. First developed in the late 1990s, these monomers now enable frameworks with surface areas exceeding 7,000 m²/g. They are classified by their backbone (aromatic, aliphatic) and functional groups, with terephthalic acid and 2-methylimidazole being common examples for MOFs, while boronic acids are favored for COFs.
Physical and Chemical Properties
Organic framework monomers exhibit high thermal stability (up to 400°C for some derivatives) and crystallinity, ensuring precise framework assembly. Their solubility in polar solvents like dimethylformamide (DMF) facilitates solution-based synthesis. Key metrics include linker length (dictating pore size) and functional group reactivity, which influence framework topology and stability. Density typically ranges from 1.2–1.8 g/cm³, with melting points often between 150–300°C. Monomers for COFs may include reversible covalent bonds (e.g., boronate esters), enabling self-correction during polymerization. Purity (>98%) is critical to avoid defects in the resulting frameworks.
Main Applications
These monomers are primarily used to synthesize MOFs for hydrogen/methane storage (e.g., UiO-66, HKUST-1) and COFs for organic electronics. In catalysis, they create scaffolds with immobilized metal nanoparticles or active sites. Their high surface area also benefits gas separation (e.g., CO₂ capture) and drug delivery systems. Emerging uses include water purification (heavy metal removal) and sensors for volatile organic compounds (VOCs). The pharmaceutical industry employs chiral monomers to build enantioselective frameworks for drug resolution. Custom monomers enable stimuli-responsive materials for smart coatings or controlled release.
Safety and Storage
Most monomers are stable but may degrade upon prolonged exposure to moisture or light. Storage in amber glass under argon at 2–8°C is recommended for sensitive compounds. Dust inhalation risks necessitate handling in fume hoods with NIOSH-rated masks. Material Safety Data Sheets (MSDS) should be reviewed for specific hazards. Some aromatic monomers are suspected irritants; nitrile gloves and lab coats are advised. Spills require neutralization with inert absorbents (e.g., vermiculite) followed by disposal as hazardous waste.
B2B Procurement Guide
Industrial buyers should prioritize suppliers with ISO-certified production to ensure batch-to-batch consistency. Key specifications include: purity (HPLC/GC-MS verified), residual solvent levels (<0.1%), and particle size uniformity. Bulk orders (100+ kg) often reduce costs by 20–30%. Sample testing is recommended to confirm compatibility with intended synthesis protocols. For MOFs, verify metal-binding efficacy via titration. Logistics must avoid temperature extremes; vacuum-sealed packaging with desiccants is standard. Leading manufacturers include Sigma-Aldrich (lab-scale) and Chinese suppliers like J&K Scientific (bulk quantities).
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