Wave Function and Density Functional Theory Studies of Dihydrogen Complexes

Area of Science:

• Computational chemistry
• Quantum chemistry
• Molecular interactions

Background:

• Dihydrogen bonds are crucial non-covalent interactions.
• Accurate computational modeling is essential for understanding these bonds.

Purpose of the Study:

• To benchmark various computational methods for dihydrogen bond complexes.
• To establish reference bond distances and interaction energies.

Main Methods:

• Performed a benchmark study on dihydrogen bond complexes.
• Assessed performance of wave function correlated and density functional theory (DFT) methods.

Main Results:

• Second-order correlation methods provide good descriptions.
• Inclusion of triple contributions is vital for high accuracy.
• No tested DFT methods achieved simultaneous accuracy in bond lengths and interaction energies.
• Nonlocal exchange contributions improved DFT results.

Conclusions:

• Wave function methods, particularly with triple contributions, are recommended for accurate dihydrogen bond studies.
• Current DFT methods require further development for precise dihydrogen bond characterization.