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Precise C2H2 Adsorption Affinity Modulation by Nitrogen Functionalization in Isostructural Coordination Networks.

Jian-Wei Cao1, Tao Zhang1, Yu-Qi Liu1

  • 1Key Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information Technology, Xi'an Key Laboratory of Functional Organic Porous Materials, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, China.

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Researchers precisely controlled pore chemistry in porous materials by adjusting nitrogen in ligands. This enhanced acetylene (C2H2) adsorption, crucial for understanding material interactions.

Keywords:
Crystal EngineeringGas separationacetylenemicroporous coordination polymer

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Area of Science:

  • Materials Science
  • Chemistry
  • Nanotechnology

Background:

  • Precise control over pore chemistry is vital for understanding porous material adsorption.
  • Functionalizing pore chemistry without altering pore size/geometry presents a significant challenge.

Purpose of the Study:

  • To develop a method for functionalizing pore chemistry in porous materials while maintaining consistent pore size and geometry.
  • To investigate the impact of varying pore polarity on acetylene adsorption within a stable porous framework.

Main Methods:

  • Utilized the NPU-1 series network as a platform for material synthesis.
  • Synthesized a series of coordination networks (NPU-1-TPB/TPP/TPT) by regulating nitrogen distribution in bilayer-pyridine ligands.
  • Employed in situ infrared spectroscopy to analyze acetylene interactions.

Main Results:

  • Achieved coordination networks with identical pore dimensions but distinct polarities.
  • Demonstrated an increase in acetylene (C2H2) adsorption enthalpies from -28.3 to -33.1 kJ mol−1.
  • Observed enhanced C2H2 interaction with the central phenyl ring of ligands correlated with nitrogen functionalization.

Conclusions:

  • The study successfully demonstrates a strategy for tuning pore polarity in porous materials without affecting pore structure.
  • Nitrogen functionalization of ligands significantly enhances acetylene adsorption affinity.
  • In situ spectroscopy provides valuable insights into the mechanism of gas-material interactions.