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Coordination Geometry and Structure-Property Relationships in Alkaline-Earth β‑Diketonate Complexes with
José Manuel Bravo-Arredondo1, Anayeli Carrasco-Ruiz2, José Andrés Reyes-Avendaño3
1Benemérita Universidad Autónoma de Puebla, Instituto de Ciencias, Centro de Investigación en Dispositivos Semiconductores, Edificio 105 C, Boulevard 14 Sur y Av. San Claudio, Col. San Manuel, Puebla, Puebla C. P. 72570, México.
Alkaline-earth metal ions influence the structure and thermal behavior of β-diketonate complexes. Increasing ionic radius affects coordination number and lattice organization in these TTA-based compounds.
Area of Science:
- Coordination Chemistry
- Inorganic Chemistry
- Materials Science
Background:
- Alkaline-earth β-diketonate complexes are of interest for their structural diversity.
- 2-thenoyltrifluoroacetone (TTA) is a versatile ligand for metal complex synthesis.
- Understanding metal ion influence is key to designing functional materials.
Purpose of the Study:
- To synthesize alkaline-earth β-diketonate complexes using TTA and 2-methylimidazole.
- To investigate the impact of varying alkaline-earth metal ions (Mg, Ca, Sr, Ba) on coordination geometry, lattice structure, and thermal properties.
- To correlate structural features with ionic radius and thermal decomposition pathways.
Main Methods:
- Single-crystal X-ray diffraction for structural determination.
- Infrared (IR) spectroscopy for coordination and functional group analysis.
- Powder X-ray diffraction and thermogravimetric analysis (TGA) for structural and thermal characterization.
Main Results:
- Ca-TTA exhibited seven-coordinate geometry, while Sr- and Ba-TTA showed eight-coordinate environments.
- A systematic increase in M-O bond lengths and unit-cell volume correlated with increasing ionic radius.
- Mg-TTA formed microcrystalline material, and all complexes incorporated protonated 2-methylimidazolium counterions.
- Metal-dependent thermal decomposition patterns were observed, with final residues suggesting inorganic phase formation.
Conclusions:
- Alkaline-earth ionic radius is a critical factor in determining coordination number and lattice organization in TTA complexes.
- Structural variations directly influence the thermal stability and decomposition behavior of these metal complexes.
- The study provides insights into the structure-property relationships of alkaline-earth β-diketonates.
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