Solution of a Puzzle: High-Level Quantum-Chemical Treatment of Pseudocontact Chemical Shifts Confirms Classic Semiempirical Theory

Overview

Journal J Phys Chem Lett

Publisher American Chemical Society

Specialty Chemistry

Date 2020 Sep 15

PMID 32930598

Citations 8

Authors

Lucas Lang

Enrico Ravera

Giacomo Parigi

Claudio Luchinat

Frank Neese

Affiliations

Soon will be listed here.

Abstract

A recently popularized approach for the calculation of pseudocontact shifts (PCSs) based on first-principles quantum chemistry (QC) leads to different results than the classic "semiempirical" equation involving the susceptibility tensor. Studies that attempted a comparison of theory and experiment led to conflicting conclusions with respect to the preferred theoretical approach. In this Letter, we show that after inclusion of previously neglected terms in the full Hamiltonian, one can deduce the semiempirical equations from a rigorous QC-based treatment. It also turns out that in the long-distance limit, one can approximate the complete tensor in terms of the tensor. By means of Kohn-Sham density functional theory calculations, we numerically confirm the long-distance expression for the tensor and the theoretically predicted scaling behavior of the different terms. Our derivation suggests a computational strategy in which one calculates the susceptibility tensor and inserts it into the classic equation for the PCS.

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