Poly[tetra-aqua-bis(μ(2)-2,4,6-trinitro-phenolato)barium(II)]

Area of Science:

• Inorganic Chemistry
• Crystal Engineering
• Materials Science

Background:

• Coordination polymers offer tunable properties based on metal ion and ligand choice.
• Barium-based coordination compounds are explored for their unique structural motifs and potential applications.
• Nitrophenolate ligands provide versatile coordination modes and potential for functionalization.

Purpose of the Study:

• To synthesize and characterize a novel barium coordination polymer using nitrophenolate ligands.
• To investigate the structural features, including coordination environment and dimensionality of the barium complex.
• To explore the stability and physical properties of the resulting crystalline material.

Main Methods:

• Single-crystal X-ray diffraction was employed to determine the molecular and crystal structure.
• Infrared spectroscopy was used to identify functional groups and coordination modes.
• Thermogravimetric analysis (TGA) could be used to study thermal stability and dehydration behavior (though not explicitly stated in abstract, implied by water loss).

Main Results:

• The asymmetric unit contains a barium ion coordinated by two nitrophenolate ligands and four water molecules, resulting in deca-coordination.
• The structure forms a one-dimensional polymeric chain through bridging nitro groups.
• Hydrogen bonding interactions involving water molecules facilitate three-dimensional packing.
• Coordination distances around barium range from 2.728(4) to 3.138(5) Å.
• The crystal slowly loses coordinated water upon exposure to air at room temperature, forming filaments.

Conclusions:

• A novel 1D barium coordination polymer with nitrophenolate ligands has been successfully synthesized and structurally characterized.
• The compound exhibits a deca-coordinated barium center and forms extended polymeric chains.
• The observed dehydration behavior suggests potential for stimuli-responsive material properties.