One-bond 13 C- 13 C spin-coupling constants in saccharides: a comparison of experimental and calculated values by density functional theory using solid-state 13 C NMR and X-ray crystallography
Methyl aldohexopyranosides were C-labeled at contiguous carbons, crystallized, and studied by single-crystal X-ray crystallography and solid-state C nuclear magnetic resonance (NMR) spectroscopy to examine the degree to which density functional theory (DFT) can calculate one-bond C- C spin-coupling...
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| Vydané v: | Physical chemistry chemical physics : PCCP Ročník 25; číslo 23; s. 16048 |
|---|---|
| Hlavní autori: | , , , , , , |
| Médium: | Journal Article |
| Jazyk: | English |
| Vydavateľské údaje: |
England
15.06.2023
|
| ISSN: | 1463-9084 |
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| Abstract | Methyl aldohexopyranosides were
C-labeled at contiguous carbons, crystallized, and studied by single-crystal X-ray crystallography and solid-state
C nuclear magnetic resonance (NMR) spectroscopy to examine the degree to which density functional theory (DFT) can calculate one-bond
C-
C spin-coupling constants (
) in saccharides with sufficient accuracy to permit their use in
'
analysis, a newly-reported hybrid DFT/NMR method that provides probability distributions of molecular torsion angles in solution (Zhang
,
, 2017,
, 3042-3058; Meredith
,
, 2022,
, 3135-3141). Experimental
values in crystalline samples of the doubly
C-labeled compounds were measured by solid-state
C NMR and compared to those calculated from five different DFT models: (1)
values calculated from single structures identical to those observed in crystalline samples by X-ray crystallography (all atom refinement); (2)
values calculated from the single structures in (1) but after Hirshfeld atom refinement (HAR); (3)
values calculated from the single structures in (1) after DFT-optimization of hydrogen atoms only; and (4 and 5)
values calculated in rotamers of torsion angle
(C1-C2-O2-O2H) or
(C4-C5-C6-O6) from which either specific or generalized parameterized equations were obtained and used to calculate
values in the specific
or
rotamers observed in crystalline samples. Good qualitative agreement was observed between calculated
values and those measured by solid-state
C NMR regardless of the DFT model, but in no cases were calculated
values quantitative, differing (over-estimated) on average by 4-5% from experimental values. These findings, and those reported recently from solution NMR studies (Tetrault
,
. B
,
, 9506-9515), indicate that improvements in DFT calculations are needed before calculated
values can be used directly as reliable constraints in
'
analyses of saccharides in solution. |
|---|---|
| AbstractList | Methyl aldohexopyranosides were
C-labeled at contiguous carbons, crystallized, and studied by single-crystal X-ray crystallography and solid-state
C nuclear magnetic resonance (NMR) spectroscopy to examine the degree to which density functional theory (DFT) can calculate one-bond
C-
C spin-coupling constants (
) in saccharides with sufficient accuracy to permit their use in
'
analysis, a newly-reported hybrid DFT/NMR method that provides probability distributions of molecular torsion angles in solution (Zhang
,
, 2017,
, 3042-3058; Meredith
,
, 2022,
, 3135-3141). Experimental
values in crystalline samples of the doubly
C-labeled compounds were measured by solid-state
C NMR and compared to those calculated from five different DFT models: (1)
values calculated from single structures identical to those observed in crystalline samples by X-ray crystallography (all atom refinement); (2)
values calculated from the single structures in (1) but after Hirshfeld atom refinement (HAR); (3)
values calculated from the single structures in (1) after DFT-optimization of hydrogen atoms only; and (4 and 5)
values calculated in rotamers of torsion angle
(C1-C2-O2-O2H) or
(C4-C5-C6-O6) from which either specific or generalized parameterized equations were obtained and used to calculate
values in the specific
or
rotamers observed in crystalline samples. Good qualitative agreement was observed between calculated
values and those measured by solid-state
C NMR regardless of the DFT model, but in no cases were calculated
values quantitative, differing (over-estimated) on average by 4-5% from experimental values. These findings, and those reported recently from solution NMR studies (Tetrault
,
. B
,
, 9506-9515), indicate that improvements in DFT calculations are needed before calculated
values can be used directly as reliable constraints in
'
analyses of saccharides in solution. |
| Author | Serianni, Anthony S Oliver, Allen G Tetrault, Timothy Yoon, Mi-Kyung Canizares, Christopher Meredith, Reagan J Carmichael, Ian |
| Author_xml | – sequence: 1 givenname: Timothy surname: Tetrault fullname: Tetrault, Timothy email: aseriann@nd.edu organization: Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556-5670, USA. aseriann@nd.edu – sequence: 2 givenname: Reagan J surname: Meredith fullname: Meredith, Reagan J email: aseriann@nd.edu organization: Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556-5670, USA. aseriann@nd.edu – sequence: 3 givenname: Mi-Kyung surname: Yoon fullname: Yoon, Mi-Kyung email: aseriann@nd.edu organization: Omicron Biochemicals, Inc., South Bend, IN 46617, USA – sequence: 4 givenname: Christopher surname: Canizares fullname: Canizares, Christopher email: aseriann@nd.edu organization: Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556-5670, USA. aseriann@nd.edu – sequence: 5 givenname: Allen G surname: Oliver fullname: Oliver, Allen G organization: Molecular Structure Facility, University of Notre Dame, Notre Dame, IN 46556-5670, USA – sequence: 6 givenname: Ian surname: Carmichael fullname: Carmichael, Ian organization: Radiation Laboratory, University of Notre Dame, Notre Dame, IN 46556-5670, USA – sequence: 7 givenname: Anthony S orcidid: 0000-0001-6114-1446 surname: Serianni fullname: Serianni, Anthony S email: aseriann@nd.edu organization: Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556-5670, USA. aseriann@nd.edu |
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| Snippet | Methyl aldohexopyranosides were
C-labeled at contiguous carbons, crystallized, and studied by single-crystal X-ray crystallography and solid-state
C nuclear... |
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| Title | One-bond 13 C- 13 C spin-coupling constants in saccharides: a comparison of experimental and calculated values by density functional theory using solid-state 13 C NMR and X-ray crystallography |
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