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Theoretical analysis of spin crossover in iron(II) [2×2] molecular grids
Ekaterina M Zueva1, Elmira R Ryabikh, Serguei A Borshch
1Department of Inorganic Chemistry, Kazan State Technological University, 68 K. Marx Street, 420015 Kazan, Russia. zueva_ekaterina@mail.ru
Spin-crossover in iron(II) molecular grids is influenced by ligand elasticity and neighboring spin states. Structural distortions dictate spin transition pathways, tunable by minor perturbations like hydrogen atom shifts.
Area of Science:
- Materials Science
- Quantum Chemistry
- Supramolecular Chemistry
Background:
- Spin-crossover (SCO) phenomena in iron(II) complexes are crucial for molecular switches.
- Understanding the interplay between ligand structure and SCO behavior is key to designing new materials.
Purpose of the Study:
- To elucidate the origin of spin-crossover pathways in iron(II) [2×2] molecular grids.
- To analyze the impact of structural distortions on spin transitions within the grid.
Main Methods:
- Quantum-chemical density functional theory (DFT) calculations.
- Energetic and structural characterization of five spin states.
- Continuous Shape Measures (CSM) for coordination polyhedra analysis.
Main Results:
- Identified spin-crossover pathways influenced by inter-center spin transitions.
- Demonstrated that ligand elasticity and induced distortions dictate the SCO sequence.
- Showed that weak perturbations, like hydrogen atom positions, can modulate SCO effects.
Conclusions:
- The elasticity of carbohydrazide-based bridging ligands plays a critical role in spin-crossover dynamics.
- Structural distortions induced by neighboring spin transitions significantly affect the overall spin behavior.
- Fine-tuning ligand properties offers a route to control spin-crossover pathways in molecular grids.
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