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Imidazol-2-ylidene stabilized tetrahedral cobalt carbonyl complexes: A computational and structural database study
1Department of Chemistry, School of Physical Sciences, College of Agriculture and Natural Sciences, University of Cape Coast, Cape Coast, Ghana.
Heliyon
|August 3, 2019
Summary
Cobalt carbonyl complexes with bulky imidazol-2-ylidene ligands show tunable electronic properties. This tunability is key for developing advanced catalysts and precursors for integrated circuit manufacturing.
Area of Science:
- Organometallic Chemistry
- Materials Science
- Computational Chemistry
Background:
- Tetrahedral cobalt carbonyl complexes with imidazol-2-ylidene ligands are investigated.
- These compounds serve as potential catalysts for alkene hydroformylation.
- They are also effective precursors for chemical vapor deposition and atomic layer deposition in integrated circuit manufacturing.
Purpose of the Study:
- To analyze the structural and electronic properties of cobalt carbonyl complexes with substituted imidazol-2-ylidene ligands.
- To correlate ligand structure with complex stability and reactivity.
- To explore their potential applications in catalysis and materials science.
Main Methods:
- Crystallographic database analysis (Cambridge Structural Database).
- Computational chemistry studies using density functional theory (BP86 level).
- Natural bond orbital (NBO) and chemical reactivity parameter analyses.
Main Results:
- Seventeen crystal structures were identified in the CSD.
- A positive correlation was observed between Im-Co and Co-CO bond lengths, indicating enhanced stability with stronger bonding.
- Increased bulkiness of alkyl substituents on imidazol-2-ylidene ligands led to longer Co-CO bonds, increased chemical softness, electronic chemical potential, and ease of ionization.
Conclusions:
- The study establishes a relationship between ligand structure and the electronic properties of cobalt carbonyl complexes.
- These findings are valuable for designing efficient catalysts for hydroformylation.
- The tunable properties make these complexes promising precursors for advanced integrated circuit fabrication.
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