Solvent effects on nuclear magnetic resonance 2J(C,Hf) and 1J(C,Hf) spin-spin coupling constantsinacetaldehyde
The known solvent dependence of 1J(Cc,Hf and 2J(C1,Hf) couplings in acetaldehyde is studied from a theoretical viewpoint based on the density functional theory approach where the dielectric solvent effect is taken into account with the polarizable continuum model. The four terms of scalar couplings,...
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todo:paper_14220067_v4_n3_p93_Zaccari2023-10-03T16:13:33Z Solvent effects on nuclear magnetic resonance 2J(C,Hf) and 1J(C,Hf) spin-spin coupling constantsinacetaldehyde Zaccari, D. Barone, V. Peralta, J.E. Contreras, R.H. Taurian, O.E. Díez, E. Esteban, A. Density functional theory Natural J coupling Solvent effect Spin-spin couplings acetaldehyde benzaldehyde dimethyl sulfoxide salicylaldehyde article complex formation density functional theory dielectric constant electron spin resonance hydrogen bond molecular interaction nuclear magnetic resonance solvation solvent effect The known solvent dependence of 1J(Cc,Hf and 2J(C1,Hf) couplings in acetaldehyde is studied from a theoretical viewpoint based on the density functional theory approach where the dielectric solvent effect is taken into account with the polarizable continuum model. The four terms of scalar couplings, Fermi contact, paramagnetic spin orbital, diamagnetic spin orbital and spin dipolar, are calculated but the solvent effect analysis is restricted to the first term since for both couplings it is by far the dominant contribution. Experimental trends of Δ1J(Cc,Hf) and Δ 2J(C1,Hf) Vs ε (the solvent dielectric constant) are correctly reproduced although they are somewhat underestimated. Specific interactions between solute and solvent molecules are studied for dimethylsulfoxide, DMSO, solutions considering two different one-to-one molecular complexes between acetaldehyde and DMSO. They are determined by interactions of type C=O-H-C and S=O-H-C, and the effects of such interactions on 1J(Cc,Hf) and 2J(C 1,Hf) couplings are analyzed. Even though only in a semiquantitative way, it is shown that the effect of such interactions on the solvent effects, of Δ1J(Cc,Hf) and Δ2J(C1,Hf), tend to improve the agreement between calculated and experimental values. These results seem to indicate that a continuum dielectric model has not enough flexibility for describing quantitatively solvent effects on spin-spin couplings. Apparently, even for relatively weak hydrogen bonding, the contribution from "direct" interactions is of the same order of magnitude as the "dielectric" effect. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_14220067_v4_n3_p93_Zaccari |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Density functional theory Natural J coupling Solvent effect Spin-spin couplings acetaldehyde benzaldehyde dimethyl sulfoxide salicylaldehyde article complex formation density functional theory dielectric constant electron spin resonance hydrogen bond molecular interaction nuclear magnetic resonance solvation solvent effect |
| spellingShingle |
Density functional theory Natural J coupling Solvent effect Spin-spin couplings acetaldehyde benzaldehyde dimethyl sulfoxide salicylaldehyde article complex formation density functional theory dielectric constant electron spin resonance hydrogen bond molecular interaction nuclear magnetic resonance solvation solvent effect Zaccari, D. Barone, V. Peralta, J.E. Contreras, R.H. Taurian, O.E. Díez, E. Esteban, A. Solvent effects on nuclear magnetic resonance 2J(C,Hf) and 1J(C,Hf) spin-spin coupling constantsinacetaldehyde |
| topic_facet |
Density functional theory Natural J coupling Solvent effect Spin-spin couplings acetaldehyde benzaldehyde dimethyl sulfoxide salicylaldehyde article complex formation density functional theory dielectric constant electron spin resonance hydrogen bond molecular interaction nuclear magnetic resonance solvation solvent effect |
| description |
The known solvent dependence of 1J(Cc,Hf and 2J(C1,Hf) couplings in acetaldehyde is studied from a theoretical viewpoint based on the density functional theory approach where the dielectric solvent effect is taken into account with the polarizable continuum model. The four terms of scalar couplings, Fermi contact, paramagnetic spin orbital, diamagnetic spin orbital and spin dipolar, are calculated but the solvent effect analysis is restricted to the first term since for both couplings it is by far the dominant contribution. Experimental trends of Δ1J(Cc,Hf) and Δ 2J(C1,Hf) Vs ε (the solvent dielectric constant) are correctly reproduced although they are somewhat underestimated. Specific interactions between solute and solvent molecules are studied for dimethylsulfoxide, DMSO, solutions considering two different one-to-one molecular complexes between acetaldehyde and DMSO. They are determined by interactions of type C=O-H-C and S=O-H-C, and the effects of such interactions on 1J(Cc,Hf) and 2J(C 1,Hf) couplings are analyzed. Even though only in a semiquantitative way, it is shown that the effect of such interactions on the solvent effects, of Δ1J(Cc,Hf) and Δ2J(C1,Hf), tend to improve the agreement between calculated and experimental values. These results seem to indicate that a continuum dielectric model has not enough flexibility for describing quantitatively solvent effects on spin-spin couplings. Apparently, even for relatively weak hydrogen bonding, the contribution from "direct" interactions is of the same order of magnitude as the "dielectric" effect. |
| format |
JOUR |
| author |
Zaccari, D. Barone, V. Peralta, J.E. Contreras, R.H. Taurian, O.E. Díez, E. Esteban, A. |
| author_facet |
Zaccari, D. Barone, V. Peralta, J.E. Contreras, R.H. Taurian, O.E. Díez, E. Esteban, A. |
| author_sort |
Zaccari, D. |
| title |
Solvent effects on nuclear magnetic resonance 2J(C,Hf) and 1J(C,Hf) spin-spin coupling constantsinacetaldehyde |
| title_short |
Solvent effects on nuclear magnetic resonance 2J(C,Hf) and 1J(C,Hf) spin-spin coupling constantsinacetaldehyde |
| title_full |
Solvent effects on nuclear magnetic resonance 2J(C,Hf) and 1J(C,Hf) spin-spin coupling constantsinacetaldehyde |
| title_fullStr |
Solvent effects on nuclear magnetic resonance 2J(C,Hf) and 1J(C,Hf) spin-spin coupling constantsinacetaldehyde |
| title_full_unstemmed |
Solvent effects on nuclear magnetic resonance 2J(C,Hf) and 1J(C,Hf) spin-spin coupling constantsinacetaldehyde |
| title_sort |
solvent effects on nuclear magnetic resonance 2j(c,hf) and 1j(c,hf) spin-spin coupling constantsinacetaldehyde |
| url |
http://hdl.handle.net/20.500.12110/paper_14220067_v4_n3_p93_Zaccari |
| work_keys_str_mv |
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