Slow magnetic relaxation in a Tb(iii)-based coordination polymer

Area of Science:

• Coordination Chemistry
• Materials Science
• Magnetochemistry

Background:

• Terbium(iii)-based coordination polymers are of interest for their magnetic and luminescent properties.
• Understanding the structure-property relationships is crucial for designing advanced materials.

Purpose of the Study:

• To synthesize and characterize a novel terbium(iii) coordination polymer (polyTb).
• To investigate the magnetic and luminescent properties of polyTb.
• To explore the influence of substrate on the material's morphology.

Main Methods:

• Synthesis via complexation of Tb(NO3)3·(6H2O) and a terpyridine ligand (L).
• Structural determination using Job's plots, DFT calculations, and X-ray absorption fine structure (XAFS).
• Characterization of magnetic properties and luminescence (photoluminescence quantum yield, φ).
• Morphological analysis on Si and glass substrates using XRD.

Main Results:

• A 1:1 Tb ion:L complex was formed.
• XAFS fitting revealed Tb-O bond distances of 2.65 Å and Tb-N bond distances of 2.95 Å.
• Field-induced magnetic relaxation was observed in both solid and solution states.
• Luminescence with a quantum yield of 6.9% was detected, originating from f-f transitions.
• PolyTb formed porous structures on Si and fibrous, oriented structures on glass.

Conclusions:

• The synthesized polyTb exhibits interesting magnetic and luminescent characteristics.
• The material's morphology is substrate-dependent, forming porous or fibrous structures.
• This study contributes to the development of functional lanthanide-based materials.