Temperature induced single-crystal-to-single-crystal transformations and structure directed effects on magnetic...

Area of Science:

• Inorganic Chemistry
• Materials Science
• Crystallography

Background:

• Coordination polymers offer tunable structures and properties.
• Metal-organic frameworks are investigated for their potential applications.

Purpose of the Study:

• To synthesize and characterize novel coordination polymers using cobalt, nickel, and copper cations with a lithium 3-pyridinesulfonate ligand.
• To investigate the solid-state architectures and hydrogen-bonding interactions within these coordination polymers.
• To explore the temperature-dependent structural rearrangements and their impact on magnetic properties.

Main Methods:

• Single crystal X-ray diffraction to determine solid-state structures.
• Infrared spectroscopy to analyze ligand-water heterocomplexation.
• Variable-temperature magnetic susceptibility measurements (1.8–400 K).

Main Results:

• Linear coordination polymers (1-3) were synthesized with 3D or 2D network architectures.
• Intermolecular hydrogen bonding between coordinated water and sulfonate groups forms cross-linked networks.
• Reversible structural contraction/relaxation was observed with temperature changes, confirmed by X-ray analysis.
• Magnetic measurements revealed an unusual transition from antiferromagnetic to ferromagnetic behavior correlated with structural changes and dehydration.

Conclusions:

• The synthesized coordination polymers exhibit stimuli-responsive structural dynamics.
• Temperature-induced structural changes significantly influence magnetic interactions.
• These findings highlight the potential of coordination polymers in developing materials with switchable magnetic properties.