Related Experiment Video
Updated: Jan 18, 2026

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
Published on: April 12, 2019
Effective Computation of Coupling Force Constants: Metal Carbonyls as a Test Case
Henrik Borgman1, Somi Vasisth1, Jörg Grunenberg1
1Institute of Organic Chemistry, TU Braunschweig, Hagenring 30, 38106 Braunschweig, Germany.
None:
An automated protocol enabling the efficient computation of unique potential coupling constants is presented. Several modern density functional (DFT) methods are tested against coupled cluster theory (CCSD(T)) in order to evaluate their quality in producing reliable compliance matrix off-diagonal elements. While force coupling constants could serve as descriptors of electron delocalization in general, we tested the ability of coupling compliance constants as descriptors of the Dewar-Chatt-Duncanson model in VCO-, CrCO, MnCO+, FeCO2+, NiCO, CuCO+, FeCO+ and the isoelectronic hexacarbonyls of the 3d and 5d series from Ti to Co, and Hf to Ir, respectively. A robust semiautomated algorithm including the computation of all compliance coupling constants as inverse covariant second derivatives is implemented in our open source version of the COMPLIANCE code.
Related Concept Videos
Spin–Spin Coupling: One-Bond Coupling
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
¹H NMR: Long-Range Coupling
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
Spin–Spin Coupling Constant: Overview
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
Metal-Ligand Bonds
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...

