Poly[[μ(7)-l-cysteato(2-)]disodium].

Area of Science:

• Materials Science
• Crystallography
• Coordination Chemistry

Background:

• Amino acids are versatile building blocks for coordination polymers.
• Sodium coordination polymers are of interest for their diverse structural motifs and potential applications.

Purpose of the Study:

• To synthesize and characterize a novel sodium coordination polymer derived from l-cysteic acid.
• To elucidate the coordination environment and structural framework of the resulting compound.

Main Methods:

• Solvent-thermal reaction of l-cysteic acid with aqueous sodium hydroxide.
• Single-crystal X-ray diffraction to determine the crystal structure and coordination geometry.

Main Results:

• The compound poly[[μ(7)-(2R)-2-amino-3-sulfonato-propano-ato]disodium], [Na(2)(C(3)H(5)NO(5)S)](n), was successfully synthesized.
• Two distinct sodium cations exhibit different coordination spheres: one is pentacoordinated (O(5)) and the other is tetracoordinated (NO(3)).
• The sulfonate oxygen atoms bridge both sodium ions, leading to a robust three-dimensional polymeric framework.

Conclusions:

• The study presents a novel sodium coordination polymer with a unique 3D framework.
• The distinct coordination geometries of sodium ions highlight the versatility of l-cysteic acid as a ligand.
• The findings contribute to the understanding of metal-organic frameworks and coordination chemistry.