Lanthanide-Based Layer-Type Two-Dimensional Coordination Polymers Featuring Slow Magnetic Relaxation, Magnetocaloric...

Area of Science:

• Materials Science
• Inorganic Chemistry
• Solid-State Chemistry

Background:

• Lanthanide-based coordination polymers (CPs) are attractive for their unique magnetic and conductive properties.
• Exploring novel 2D CPs with tailored structures is crucial for developing advanced functional materials.

Purpose of the Study:

• To synthesize and characterize three new lanthanide-based 2D coordination polymers (CPs) using phosphonoacetic acid.
• To investigate the magnetic properties, magnetocaloric effect, and proton conductivity of the synthesized CPs.

Main Methods:

• Hydrothermal synthesis of lanthanide-based coordination polymers.
• Single-crystal X-ray diffraction for structural analysis.
• Magnetic susceptibility measurements and ab-initio calculations.
• Impedance spectroscopy for proton conductivity analysis.

Main Results:

• Three 2D CPs incorporating Dy3+, Er3+, and Gd3+ were successfully synthesized.
• CP 1 (Dy3+) and CP 2 (Er3+) exhibit field-induced slow magnetic relaxation, attributed to axial g tensors.
• CP 3 (Gd3+) displays a significant magnetocaloric effect (-ΔSm = 49.29 J kg−1 K−1).
• All CPs demonstrate high proton conductivity at elevated temperatures and humidity.

Conclusions:

• The synthesized 2D lanthanide CPs show promising slow magnetic relaxation and magnetocaloric properties.
• High proton conductivity suggests potential applications in electrochemical devices.
• Structural variations influence the magnetic and conductive behaviors, offering pathways for material design.