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¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Tunable π-Basic Platforms in Porous Crystals for Enhanced C2H2/CO2 Separation at Elevated Temperature.

Muyu Zhang1, Lin Yin2, Surya Abdumaimaiti2

  • 1State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing, China.

Small (Weinheim an Der Bergstrasse, Germany)
|April 21, 2026
PubMed
Summary

Researchers developed a new porous material (NTU-65-th) for efficiently separating acetylene from carbon dioxide at high temperatures. This advanced material offers significant energy savings for industrial applications.

Keywords:
dual chelation configurationhigh‐temperature C2H2/CO2 separationporous crystalπ‐basic platform

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Separation Science

Background:

  • Adsorptive separation of acetylene (C2H2) from carbon dioxide (CO2) is crucial for energy savings in industrial processes.
  • High-temperature separations present challenges due to reduced adsorption affinities and selectivities.

Purpose of the Study:

  • To engineer a porous coordination polymer (PCP) with tunable pore chemistry for selective acetylene adsorption.
  • To achieve efficient C2H2/CO2 separation at elevated temperatures (353 K) using a novel material.

Main Methods:

  • Systematic ligand functionalization of a soft framework (NTU-65) with π-conjugated units.
  • Utilizing a dual chelation mode for selective C2H2 confinement within the engineered pores.
  • Employing computational modeling and in situ spectroscopy to verify the adsorption mechanism.

Main Results:

  • The optimal material, NTU-65-th, demonstrated C2H2-specific gate-opening behavior.
  • A dual chelation mechanism involving π-systems and electronegative anions selectively trapped C2H2.
  • Achieved high C2H2 uptake and promising C2H2/CO2 separation at 353 K with facile regeneration.

Conclusions:

  • Precise pore chemistry modulation in PCPs can overcome the affinity-selectivity trade-off at high temperatures.
  • NTU-65-th offers a viable route for energy-efficient acetylene/carbon dioxide separation.
  • This study advances the design principles for advanced separation materials.