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Linking the Interatomic Exchange-Correlation Energy to Experimental J-Coupling Constants
- Source :
- Alkorta, I & Popelier, P L A 2023, ' Linking the interatomic exchange-correlation energy to experimental J-coupling constants ', Journal of Physical Chemistry A . https://doi.org/10.1021/acs.jpca.2c07693
- Publication Year :
- 2023
- Publisher :
- American Chemical Society (ACS), 2023.
-
Abstract
- The main aim of the current work is to find an experimental connection to the interatomic exchange-correlation energy as defined by the energy decomposition method Interacting Quantum Atoms (IQA). A suitable candidate as (essentially) experimental quantity is the nuclear magnetic resonance (NMR) J-coupling constant denoted 3J(H,H′), which a number of previous studies showed to correlate well with QTAIM’s delocalization index (DI), which is essentially a bond order. Inspired by Karplus equations, here, we investigate correlations between 3J(H,H′) and a relevant dihedral angle in six simple initial compounds of the shape H3C-YHn (Y = C, N, O, Si, P, and S), N- methylacetamide (as prototype of the peptide bond), and five peptide-capped amino acids (Gly, Ala, Val, Ile, and Leu) because of the protein direction of the force field FFLUX. In conclusion, except for methanol, the inter-hydrogen exchange-correlation energy Vxc(H,H′) makes the best contact with experiment, through 3J(H,H′), when multiplied with the internuclear distance RHH′.<br />This work was carried out with financial support from the Ministerio de Ciencia, Innovación y Universidades (PID2021- 125207NB-C32) and Comunidad de Madrid (P2018/EMT- 4329 AIRTEC-CM). Gratitude is due to the CTI (CSIC) for their continued computational support. P.L.A.P. acknowledges the EPSRC for funding through the award of an Established Career Fellowship (grant EP/K005472).
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Details
- ISSN :
- 15205215 and 10895639
- Volume :
- 127
- Database :
- OpenAIRE
- Journal :
- The Journal of Physical Chemistry A
- Accession number :
- edsair.doi.dedup.....f45405a2a65b10c6a70fd18b5b77c216