Yttrium ethyl-enediammonium squarate tetra-hydrate

Area of Science:

• Coordination Chemistry
• Materials Science
• Crystallography

Background:

• Yttrium complexes with organic ligands are explored for diverse applications.
• Squarate ligands offer unique coordination modes and structural possibilities.
• Coordination polymers provide tunable properties based on their framework architecture.

Purpose of the Study:

• To synthesize and characterize a novel coordination polymer involving yttrium and squarate.
• To elucidate the crystal structure and bonding of the title compound.
• To investigate the structural role of ethylenediamine and hydrogen bonding in the material's cohesion.

Main Methods:

• Slow evaporation of an acid solution for crystal synthesis.
• Single-crystal X-ray diffraction for structural determination.
• Analysis of coordination environment and intermolecular interactions.

Main Results:

• The synthesized compound is catena-poly[sesqui(ethyl-enediammonium) [[tetra-aquabis-(squarato-κO)yttrium(III)]-μ-squarato-κ(2)O:O']].
• The asymmetric unit contains yttrium in an anti-prismatic environment, squarate groups, ethylenediammonium ions, and water molecules.
• Infinite zigzag chains are formed by YO(8) polyhedra linked by squarate bridges, with ammonium groups situated between chains.

Conclusions:

• The crystal structure reveals a 1D coordination polymer with a unique zigzag chain motif.
• Hydrogen bonding interactions involving amine groups, water, and squarate anions are crucial for structural stability.
• The study contributes to understanding the assembly of yttrium-based coordination polymers with organic linkers.