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Preparation of Highly Porous Coordination Polymer Coatings on Macroporous Polymer Monoliths for Enhanced Enrichment of Phosphopeptides
Published on: July 14, 2015
Pore design of two-dimensional coordination polymers toward selective adsorption
Yuh Hijikata1, Satoshi Horike, Masayuki Sugimoto
1Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.
Inorganic Chemistry
|March 19, 2013
Summary
Researchers synthesized four porous coordination polymers (PCPs) with varying structures by altering dinitrogen linker ligands. Ligand length controlled framework flexibility and gas adsorption properties, demonstrating a strategy for selective gas uptake in PCPs.
Area of Science:
- Materials Science
- Chemistry
- Nanotechnology
Background:
- Porous coordination polymers (PCPs) are advanced materials with tunable structures and properties.
- Controlling the assembly and flexibility of PCPs is crucial for targeted applications like gas adsorption.
- The choice of organic ligands significantly influences the final structure and porosity of PCPs.
Purpose of the Study:
- To synthesize and characterize four novel porous coordination polymers (PCPs) using Zn(2+), 4,4'-sulfonyldibenzoate (sdb), and various dinitrogen linker ligands.
- To investigate the impact of dinitrogen linker length and type on the assembled structures, framework flexibility, and gas adsorption properties of the synthesized PCPs.
- To demonstrate a strategy for controlling pore size and structural assembly in PCPs for selective gas adsorption.
Main Methods:
- Synthesis of four PCPs: [Zn2(sdb)2(dabco)]n (1), [Zn2(sdb)2(bpb)]n (2), [Zn2(sdb)2(bpt)]n (3), and [Zn2(sdb)2(bpy)]n (4).
- Structural characterization using X-ray analysis and infrared (IR) spectroscopy under gas atmosphere.
- Gas adsorption studies for CO2, CH4, C2H6, and C2H4, including solid-state 2H NMR for framework dynamics.
Main Results:
- Four distinct PCP structures were obtained, with ligand length dictating framework assembly (noninterpenetrated, interdigitated, or interpenetrated) and flexibility.
- Flexible frameworks of PCPs 2 and 3 exhibited stepwise adsorption behaviors for various gases, influenced by pore size and gas properties.
- PCP 4 showed limited flexibility and smaller void space, adsorbing C2H6 or C2H4 via a gate-opening mechanism, with negligible CH4 uptake.
Conclusions:
- The length and type of dinitrogen linker ligands are key factors in controlling the assembled structures and flexibility of Zn(2+)-sdb based PCPs.
- Framework flexibility directly influences the selective gas adsorption properties, enabling stepwise uptake or gate-opening phenomena.
- The study successfully demonstrates a strategy to tailor PCP pore size and structure for targeted selective gas adsorption applications.
