Poly[lead(II)-mu2-aqua-mu4-terephthalato]

Area of Science:

• Inorganic Chemistry
• Crystal Engineering
• Materials Science

Background:

• Terephthalate ligands are widely used in coordination chemistry.
• Lead compounds exhibit diverse coordination geometries and structural motifs.
• Understanding the formation of insoluble metal-organic frameworks is crucial for materials design.

Purpose of the Study:

• To synthesize and characterize a novel lead terephthalate compound.
• To elucidate the crystal structure and coordination environment of lead.
• To identify and analyze supramolecular motifs within the lead complex.

Main Methods:

• Reaction of sodium terephthalate with lead(II) nitrate in aqueous solution.
• Single-crystal X-ray diffraction analysis to determine the crystal structure.
• Analysis of coordination modes and hydrogen bonding interactions.

Main Results:

• Formation of an insoluble lead terephthalate polymer, [Pb(C(8)H(4)O(4))(H(2)O)](n).
• The crystal structure is centrosymmetric with a hemidirected seven-coordinate lead geometry.
• Observed both monodentate and bidentate carboxylate coordination, alongside hydrogen bonds, forming a 3D network.
• First reported instance of the R(1)(1)(6) graph-set motif in a lead complex.

Conclusions:

• A novel lead terephthalate coordination polymer was successfully synthesized and structurally characterized.
• The study highlights the versatility of terephthalate as a ligand in lead coordination chemistry.
• The identification of the R(1)(1)(6) motif provides new insights into supramolecular assembly in lead-based materials.