Exploring Trans Effect Concept in Pt(II) Complexes through the Quantum Theory of Atoms in Molecules and Chemical Bond Overlap Model Perspectives.

This study utilizes Density Functional Theory (DFT) alongside the Chemical Bond Overlap (OP) Model and Quantum Theory of Atoms in Molecules (QTAIM) to reinterpret the well‐established trans effect in square‐planar Pt(II) complexes. Investigating ligand exchange mechanisms in trans‐[Pt(NH3)2${\rm Pt}{({\rm NH}_3)}_2$(H2O${\rm H}_2{\rm O}$)T] (T = F−${\rm F}^-$, NH3${\rm NH}_3$, Cl−${\rm Cl}^-$, CH3−${\rm CH}_3^-$, CO, CN−${\rm CN}^-$) via transition state localization and intrinsic reaction coordinate calculations, overlap descriptors (OP/TOP) such as density, repulsion, and polarizability are computed for Pt−T and Pt−L bonds for reactants and transition states. Through OP/TOP and QTAIM, key descriptors correlating are identified with the trans‐directing effectiveness of ligands, revealing higher electron density donation and more electron‐rich bonds in stronger trans‐directing ligands. This combined methodology offers insights into ligand trans‐directing character, enhancing understanding of their reactivity and bonding behavior. [ABSTRACT FROM AUTHOR]