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Capturing the Trans Influence in Low-Spin d(8) Square-Planar Platinum(II) Systems using Molecular Mechanics
Anna E Anastasi1, Robert J Deeth1
1Inorganic Computational Chemistry Group, Department of Chemistry, University of Warwick, Coventry CV4 7AL, U.K.
Ligand field molecular mechanics accurately models trans influence in platinum(II) complexes by including ligand field stabilization energy (LFSE). This method improves molecular modeling of coordination compounds, with some adjustments for specific ligands.
Area of Science:
- Computational chemistry
- Inorganic chemistry
Background:
- Molecular modeling of coordination complexes presents challenges for traditional force field methods.
- Accurate modeling requires explicit treatment of d electron effects.
Purpose of the Study:
- To apply ligand field molecular mechanics (LFME) to model the trans influence in tetracoordinate Pt(II) complexes.
- To develop and validate force field parameters for various ligands.
Main Methods:
- Development of LFME parameters within the Merck molecular force field.
- Utilizing Density Functional Theory (DFT) structures and energies as reference data.
- Modeling of Pt(II) complexes with general formulas PtX4, PtX3Y, cis-PtX2Y2, and trans-PtX2Y2.
Main Results:
- Generally good reproduction of geometric changes and relative energies for Pt(II) complexes.
- Deviations observed for PH3 and H(-) ligands, partially resolved by using PMe3.
- Successful parameterization for NR3 and PR3 ligands, predicting distortions and dissociation.
Conclusions:
- LFSE in low-spin d(8) Pt(II) complexes ensures planar coordination and electronic communication, enabling accurate trans influence description.
- The developed LFME approach provides a robust method for modeling coordination complexes.
- The study highlights the importance of ligand field effects in computational chemistry.
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