σ-Donation and π-Backdonation Effects in Dative Bonds of Main-Group Elements

Area of Science:

• Computational chemistry
• Chemical bonding theory

Background:

• Dative bonding is crucial for understanding chemical interactions and processes.
• Elucidating the nuances of donor-acceptor interactions is key to advancing chemical insights.

Purpose of the Study:

• To computationally investigate and differentiate various types of dative interactions.
• To develop a comprehensive dataset (DAT20) of dative bond complexes for analysis.
• To propose a novel classification system for dative bonds.

Main Methods:

• Development of the DAT20 dataset comprising 20 dative bond complexes.
• Benchmark study of popular density functionals for accurate interaction energies and geometries.
• Application of frontier molecular orbitals, ETS-NOCV, and NEDA for detailed analysis.

Main Results:

• Identified two distinct trends within the DAT20 complex dataset.
• Quantified the extent of forward and backdonation between donor and acceptor molecules.
• Correlated donation patterns with total interaction energies and molecular geometries.

Conclusions:

• Computational analysis provides significant insights into dative bond variations.
• The interplay of forward and backdonation significantly influences interaction energies and geometries.
• A new classification of dative bonds is proposed based on these findings.