Poly[μ(2)-aqua-μ(2)-(pyrazine-2-carboxyl-ato)-lithium].

Area of Science:

• Coordination Chemistry
• Crystal Engineering
• Materials Science

Background:

• Metal-organic frameworks (MOFs) and coordination polymers are widely studied for their diverse applications.
• Lithium compounds exhibit unique coordination behaviors relevant to materials design.
• Pyrazine-2-carboxylate is a versatile ligand capable of forming extended structures.

Purpose of the Study:

• To elucidate the crystal structure of the title compound, [Li(C(5)H(3)N(2)O(2))(H(2)O)](n).
• To understand the coordination environment of the Li(I) ion and the assembly of the molecular structure.
• To investigate the role of ligands and water molecules in forming extended networks.

Main Methods:

• Single-crystal X-ray diffraction analysis was employed to determine the atomic arrangement.
• Structural analysis focused on coordination geometry, bridging modes, and intermolecular interactions.
• Hydrogen bonding networks were identified and characterized.

Main Results:

• The title compound features Li(I) ions in a distorted trigonal-bipyramidal coordination environment.
• Pyrazine-2-carboxylate ligands bridge Li(I) ions via carboxylate groups.
• Two aqua oxygen atoms also act as bridging ligands, forming Li(2)O(2) units with an Li-Li distance of 3.052(4) Å.
• These units assemble into molecular ribbons propagating along the c-axis.
• A hydrogen bonding network involving water molecules and carboxylate oxygen atoms links the ribbons.

Conclusions:

• The study successfully determined the intricate crystal structure of the lithium-pyrazine-2-carboxylate-water compound.
• The formation of molecular ribbons is driven by a combination of coordination bonds and hydrogen bonding.
• This work provides insights into the self-assembly principles for constructing novel coordination materials.