Transition from a 1D Coordination Polymer to a Mixed-Linker Layered MOF

Area of Science:

• Materials Science
• Crystallography
• Coordination Chemistry

Background:

• Metal-organic frameworks (MOFs) are crystalline materials with tunable porous structures.
• Coordination polymers offer a versatile platform for MOF synthesis.
• The geometry of organic linkers significantly influences framework dimensionality and properties.

Purpose of the Study:

• To synthesize a novel copper(II) metal-organic framework (MOF) with a 3D architecture.
• To investigate the structural transformation from a 1D coordination polymer to a 2D layered MOF.
• To explore the influence of linker modification on MOF structure and diffusion properties.

Main Methods:

• Solvothermal synthesis of a copper(II) coordination polymer using H-L1 linker.
• Incorporation of 1,4-benzenedicarboxylic acid (H2BDC) to induce framework dimensionality change.
• Characterization of the resulting 3D MOF structure and its isoreticular analogue using H2NDC.

Main Results:

• Successful synthesis of a 1D coordination polymer based on copper(II) and H-L1.
• Formation of a 2D layered MOF structure through the addition of H2BDC, stabilized by hydrogen bonding.
• The 3D MOF exhibits 1D channels with varying pore windows, leading to slow diffusion.
• An isoreticular MOF was synthesized by replacing H2BDC with H2NDC.

Conclusions:

• The judicious choice of linkers can control the dimensionality and porosity of MOFs.
• The synthesized MOF possesses a unique pore structure that facilitates slow diffusion.
• This study demonstrates a pathway for designing MOFs with specific channel characteristics for potential applications in separation or controlled release.