Highly branched and loop-rich gels via formation of metal–organic cages linked by polymers
| Autor: | Vladimir K. Michaelis, Jeremiah A. Johnson, Eric G. Keeler, Robert G. Griffin, Michael J. A. Hore, Aleksandr V. Zhukhovitskiy, Darrin J. Pochan, Mingjiang Zhong, Jessie E. P. Sun, Adam P. Willard |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Polymers
Surface Properties General Chemical Engineering 02 engineering and technology Molecular Dynamics Simulation 010402 general chemistry Ligands 01 natural sciences Article Metal Shear modulus Molecular dynamics Organometallic Compounds Organic chemistry Group 2 organometallic chemistry chemistry.chemical_classification Ligand General Chemistry Polymer 021001 nanoscience & nanotechnology Elasticity 0104 chemical sciences Supramolecular polymers Crystallography chemistry visual_art visual_art.visual_art_medium Self-assembly 0210 nano-technology Gels |
| Zdroj: | Nature chemistry |
| ISSN: | 1755-4349 1755-4330 |
| Popis: | Gels formed via metal-ligand coordination typically have very low branch functionality, f, as they consist of ∼2-3 polymer chains linked to single metal ions that serve as junctions. Thus, these materials are very soft and unable to withstand network defects such as dangling ends and loops. We report here a new class of gels assembled from polymeric ligands and metal-organic cages (MOCs) as junctions. The resulting 'polyMOC' gels are precisely tunable and may feature increased branch functionality. We show two examples of such polyMOCs: a gel with a low f based on a M2L4 paddlewheel cluster junction and a compositionally isomeric one of higher f based on a M12L24 cage. The latter features large shear moduli, but also a very large number of elastically inactive loop defects that we subsequently exchanged for functional ligands, with no impact on the gel's shear modulus. Such a ligand substitution is not possible in gels of low f, including the M2L4-based polyMOC. |
| Databáze: | OpenAIRE |
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