Poly[[tetra-kis-(μ(2)-pyrazine N,N'-dioxide-κO:O')holmium(III)] tris-(perchlorate)]

Area of Science:

• Inorganic Chemistry
• Crystallography
• Materials Science

Background:

• Lanthanide coordination networks are crucial in developing advanced materials.
• Understanding the structural nuances of these networks informs material properties.
• Pyrazine N,N'-dioxide ligands offer versatile coordination capabilities.

Purpose of the Study:

• To synthesize and characterize a novel three-dimensional coordination network of holmium.
• To elucidate the coordination environment of the holmium cation and ligand arrangements.
• To investigate the role of perchlorate anions and hydrogen bonding in the network structure.

Main Methods:

• Single-crystal X-ray diffraction was employed to determine the three-dimensional structure.
• Analysis of coordination geometry around the holmium ion.
• Identification of ligand types and their symmetry elements.
• Characterization of anion positions and intermolecular interactions.

Main Results:

• A novel 3D coordination network, {[Ho(C(4)H(4)N(2)O(2))(4)](ClO(4))(3)}(n), was successfully synthesized and structurally characterized.
• The holmium(III) cation is coordinated by eight oxygen atoms from bridging pyrazine N,N'-dioxide ligands in a distorted square antiprismatic geometry.
• Two unique pyrazine N,N'-dioxide ligands and two unique perchlorate anions were identified, with anions residing in channels and engaging in C-H⋯O hydrogen bonds.

Conclusions:

• The synthesized holmium coordination network is isostructural with other lanthanide analogues, indicating predictable structural behavior within the series.
• The intricate arrangement of ligands and anions, along with hydrogen bonding, contributes to the overall stability and characteristics of the network.
• This detailed structural analysis provides a foundation for exploring potential applications of such lanthanide-based coordination compounds.