Addressing Through-H Magnetic Interactions: A Comprehensive ab Initio Analysis of This Efficient Coupler

Area of Science:

• * Inorganic Chemistry
• * Quantum Chemistry
• * Materials Science

Background:

• * Analysis of exchange coupling in a structurally characterized Copper(II)2 complex.
• * Investigating the role of hydrogen bonds in magnetic interactions.
• * Complementary insights beyond Density Functional Theory (DFT) calculations.

Purpose of the Study:

• * To analyze the role of H bonds in generating efficient magnetic interactions.
• * To provide state-of-the-art ab initio insights into magnetic coupling mechanisms.
• * To quantitatively evaluate the contribution of specific mechanisms to exchange interactions.

Main Methods:

• * Ab initio electronic structure calculations.
• * Wave function expansion based upon localized orbitals.
• * Singlet-triplet splitting calculations.

Main Results:

• * Identified a mechanism involving concerted oxygen-to-metal charge transfer and electronic redistribution within the OH bond.
• * Quantified the enhancement of magnetic coupling due to this H-bond mediated mechanism.
• * Determined that this mechanism accounts for approximately 35% of the experimental singlet-triplet energy difference.

Conclusions:

• * Hydrogen bonds play a critical role in establishing efficient magnetic interactions.
• * The analyzed mechanism involving charge transfer and electronic redistribution significantly enhances magnetic coupling.
• * Hydrogen bonds are valuable not only for intermolecular contacts but also as fundamental units within magnetic materials.