Substituent Effect Parameters: Extending the Applications to Organometallic Chemistry

Area of Science:

• Organometallic Chemistry
• Computational Chemistry
• Materials Science

Background:

• Metal complex properties depend on both metal ions and ligands.
• Ligand design is crucial for tuning metal complex reactivity and properties.
• Existing ligand quantification methods require enhancement for predictable synthesis.

Purpose of the Study:

• To introduce and apply molecular electrostatic potential (MESP) based substituent constants as effective ligand electronic parameters.
• To forecast interaction energies in various organometallic complexes using MESP parameters.
• To demonstrate the utility of MESP parameters in designing ligands with predictable chemical properties.

Main Methods:

• Quantum chemical calculations to derive MESP parameters from substituted benzenes.
• Application of MESP based substituent constants to predict interaction energies.
• Systematic variation of ligands and metal ions in (pyr*)W(CO)5, (NHC*)Mo(CO)5, and (η6-arene*)Cr(CO)3 complexes.

Main Results:

• MESP parameters effectively quantify ligand electronic effects.
• Accurate prediction of interaction energies in the studied organometallic complexes.
• Demonstrated linear relationships between ligand structural variations and energetic parameters.

Conclusions:

• MESP parameters serve as superior quantifiers for ligand design in organometallic chemistry.
• This approach facilitates the synthesis of metal complexes with predictable chemical properties.
• The study highlights the importance of ligand-metal interactions in assessing complex reactivity.