[Ln(terpy)]3+ (Ln = Sm, Gd) entity forms isolated magnetic chains with [W(CN)8]3-

Area of Science:

• Coordination chemistry
• Supramolecular chemistry
• Magnetochemistry

Background:

• Lanthanide and transition metal complexes are crucial in developing novel magnetic materials.
• Cyano-bridged coordination polymers offer tunable magnetic properties.
• Terpyridine ligands provide structural stability and influence magnetic interactions.

Purpose of the Study:

• To synthesize and characterize novel isomorphous 1-D cyano-bridged coordination chains incorporating lanthanide (Ln) and tungsten (W) ions.
• To investigate the crystal structure and supramolecular assembly of these chains.
• To explore the magnetic properties and coupling mechanisms within the synthesized materials.

Main Methods:

• Single-crystal X-ray diffraction for structural analysis.
• Infrared spectroscopy for functional group identification.
• Magnetic susceptibility measurements to determine magnetic interactions.

Main Results:

• Successful synthesis of isomorphous 1-D cyano-bridged chains: [Ln(III)(terpy)(DMF)4][W(V)(CN)8]·6H2O (Ln = Gd, Sm).
• Crystal structures reveal alternating {[W(CN)8]} and {[Ln(terpy)]} building blocks forming 1-D chains, extended to 2-D layers via pi-pi stacking and hydrogen bonding.
• Magnetic studies indicate weak antiferromagnetic coupling in the Gd(III)-W(V) chains (J = -2.3(2) K) and an effective antiferromagnetic coupling in the Sm(III)-W(V) chains (J = +2.0(5) K).

Conclusions:

• The synthesized compounds exhibit isolated magnetic chain behavior.
• The crystal structure facilitates weak intermolecular interactions, influencing the overall magnetic properties.
• The study provides insights into the structure-magnetic property relationships in lanthanide-tungsten cyano-bridged systems.