Three-dimensional 3d-4f heterometallic coordination polymers: synthesis, structures, and magnetic properties

Area of Science:

• Inorganic Chemistry
• Materials Science
• Crystallography

Background:

• Coordination polymers offer tunable structures and properties.
• 3d-4f heterometallic systems are of interest for their unique magnetic and electronic characteristics.
• Quinolinic acid (H2QA) is a versatile ligand for constructing complex frameworks.

Purpose of the Study:

• To synthesize and characterize novel 3d-4f heterometallic coordination polymers.
• To investigate the structural features, including dimensionality and channel systems.
• To explore the magnetic behavior of the newly synthesized compounds.

Main Methods:

• Hydrothermal synthesis followed by cooling-down crystallization.
• Single-crystal X-ray diffraction for structural determination.
• Magnetic susceptibility measurements to analyze magnetic properties.

Main Results:

• Three isostructural 3D coordination polymers with the formula [Ln(2)(H(2)O)(4)M(2)(H(2)O)(2)(QA)(5)].nH(2)O were successfully synthesized (Ln = Gd, Dy; M = Ni, Co).
• The compounds exhibit 3D frameworks containing 1D chairlike channels along the c axis, occupied by noncoordinating water molecules.
• Crystal data confirmed the orthorhombic space group Pna2(1) for all three compounds, with detailed lattice parameters provided.
• Preliminary investigation of the magnetic behaviors of the synthesized coordination polymers was conducted.

Conclusions:

• The successful synthesis of novel 3D-4f heterometallic coordination polymers demonstrates the utility of hydrothermal methods.
• The isostructural nature and the presence of 1D channels highlight the controlled assembly of these materials.
• Further studies on the magnetic properties are warranted to understand the interplay between the 3d and 4f metal ions.