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Dysprosium Chlorocyanoanilate-Based 2D-Layered Coordination Polymers.
Suchithra Ashoka Sahadevan1,2, Noemi Monni1, Alexandre Abhervé2
1Dipartimento di Scienze Chimiche e Geologiche , Università degli Studi di Cagliari , S.S. 554, Bivio per Sestu , I-09042 Monserrato , Cagliari , Italy.
Inorganic Chemistry
|October 1, 2019
Summary
Researchers synthesized novel two-dimensional coordination polymers (CPs) using dysprosium and a unique anilate ligand. Different synthesis methods yielded diverse network structures, including the first reported polymorphism in anilate-based CPs.
Area of Science:
- Materials Chemistry
- Coordination Chemistry
- Supramolecular Chemistry
Background:
- Two-dimensional (2D) layered coordination polymers (CPs) offer tunable properties for advanced materials.
- Anilate ligands provide versatile building blocks for constructing complex coordination networks.
- Dysprosium(III) (DyIII) ions are key components in developing magnetic and luminescent materials.
Purpose of the Study:
- To synthesize and structurally characterize novel 2D coordination polymers based on a heterosubstituted anilate ligand (ClCNAn2-) and DyIII ions.
- To investigate the influence of synthetic methods and conditions on the resulting network topologies and structures.
- To explore polymorphism in anilate-based CPs and study the magnetic properties of the synthesized compounds.
Main Methods:
- Synthesis of coordination polymers using conventional one-pot reactions, layering techniques, and solvothermal methods.
- Structural characterization of the synthesized compounds using X-ray diffraction.
- Polymorphic transformation studies using differential scanning calorimetry (DSC) and thermogravimetry (TGA).
- Magnetic property measurements.
Main Results:
- Four distinct 2D coordination polymers (compounds 1, 1', 2, and 3) were successfully synthesized and structurally characterized.
- Compounds 1 and 1' represent the first reported examples of polymorphism in anilate-based CPs, exhibiting different network topologies and hydration levels.
- The synthesized CPs display diverse network structures, including (8,3), (4,3), (6,3), and (4,4) topologies with varying cavity sizes and shapes.
- Thermal analysis revealed an exothermic polymorphic transformation from the kinetically stable phase 1' to the thermodynamically stable phase 1.
- Magnetic studies indicated depopulation of DyIII m levels and suggested the possibility of weak antiferromagnetic coupling.
Conclusions:
- The synthetic approach significantly influences the structure and topology of DyIII-based anilate coordination polymers.
- The discovery of polymorphism in compounds 1 and 1' highlights the complexity and tunability of these materials.
- The synthesized coordination polymers exhibit interesting structural diversity and magnetic behaviors, paving the way for further exploration in materials science.
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