A three-dimensional Pb(II) coordination framework: poly[[μ4-(E)-2,2'-(diazene-1,2-diyl)dibenzoato]dimethanollead(II)]

Area of Science:

• Coordination Chemistry
• Materials Science
• Crystallography

Background:

• Coordination polymers are crystalline materials constructed from metal ions and organic ligands.
• The self-assembly of metal-organic frameworks (MOFs) offers tunable properties for various applications.
• Lead(II) coordination polymers are explored for their diverse structural motifs and potential functionalities.

Purpose of the Study:

• To synthesize and characterize a novel coordination polymer based on lead(II).
• To investigate the structural features and dimensionality of the resulting metal-organic framework.
• To determine the topological properties of the three-dimensional framework.

Main Methods:

• Single-crystal X-ray diffraction was employed to determine the molecular and crystal structure.
• The synthesis involved the reaction of a lead(II) salt with the 2,2'-(diazene-1,2-diyl)dibenzoate ligand in the presence of methanol.
• Structural analysis focused on coordination environment, ligand binding, and network dimensionality.

Main Results:

• A novel coordination polymer, [Pb(C14H8N2O4)(CH3OH)2]n, was successfully synthesized.
• The crystal structure revealed eight-coordinated Pb(II) centers forming distorted dodecahedra.
• The structure self-assembled into a 3D framework with a 4(12)6(3) topology through 1D chains and 2D layers linked by ligands.

Conclusions:

• The study presents a new lead(II) coordination polymer with a complex 3D framework.
• The intricate network topology arises from the chelating and bridging nature of the diazene-diyl-dibenzoate ligand.
• This work contributes to the understanding of structure-property relationships in lead-based metal-organic materials.