Efficient calculation of nuclear spin-rotation constants from auxiliary density functional theory

Area of Science:

• Computational Chemistry
• Quantum Chemistry
• Spectroscopy

Background:

• Calculating spin-rotation tensors is computationally intensive, limiting studies of large systems.
• Accurate theoretical prediction of these tensors is crucial for molecular structure elucidation.

Purpose of the Study:

• To present a computationally efficient method for calculating spin-rotation tensors using ADFT-GIAO.
• To validate the accuracy of the ADFT-GIAO method against experimental and other theoretical data.
• To explore the feasibility of studying temperature effects on spin-rotation tensors.

Main Methods:

• Auxiliary Density Functional Theory (ADFT) combined with the Gauge Including Atomic Orbital (GIAO) scheme.
• Benchmarking computational performance on large carbon fullerene models.
• Investigating temperature effects on the spin-rotation tensor of a specific molecular complex.

Main Results:

• The ADFT-GIAO method dramatically reduces computational time for magnetic shielding tensor calculations.
• ADFT-GIAO results show good agreement with experimental data and coupled-cluster methods.
• The method enables feasible calculations for large systems and molecular dynamics.
• Temperature-dependent spin-rotation tensor analysis can identify molecular isomers.

Conclusions:

• The ADFT-GIAO methodology offers a computationally efficient and accurate approach for spin-rotation tensor calculations.
• This method opens avenues for studying complex molecular systems and dynamic processes.
• Investigating temperature effects on spin-rotation tensors provides a novel experimental identification tool for molecular structures.