Comparar métodos
Examine os métodos selecionados lado a lado; as linhas que diferem ficam destacadas.
| NOESY× | COSY× | NMR Spin-Echo× | |
|---|---|---|---|
| Área | Espectroscopia | Espectroscopia | Espectroscopia |
| Família | Process / pipeline | Process / pipeline | Process / pipeline |
| Ano de origem≠ | 1981 | 1976 | 1950 |
| Autor original≠ | Richard Ernst | Wüthrich Kurt | Erwin Hahn |
| Tipo≠ | Two-dimensional pulse sequence | Two-dimensional pulse sequence | Spectroscopic pulse sequence |
| Fonte seminal≠ | Aue, W. P., Bartholdi, E., & Ernst, R. R. (1976). Two-dimensional spectroscopy. Application to nuclear magnetic resonance. The Journal of Chemical Physics, 64(5), 2229-2246. DOI ↗ | Aue, W. P., Bartholdi, E., & Ernst, R. R. (1976). Two-dimensional spectroscopy. Application to nuclear magnetic resonance. The Journal of Chemical Physics, 64(5), 2229-2246. DOI ↗ | Hahn, E. L. (1950). Spin echoes. Physical Review, 80(4), 580-594. DOI ↗ |
| Outros nomes≠ | NOE spectroscopy, 2D NOESY, NOE NMR | COSY NMR, 2D COSY, 1H-1H COSY | CPMG pulse sequence, spin-echo NMR |
| Relacionados≠ | 3 | 4 | 4 |
| Resumo≠ | Nuclear Overhauser Enhancement Spectroscopy (NOESY) is a 2D NMR technique that detects through-space dipolar coupling between protons, rather than through-bond scalar coupling. Introduced by Macura and Ernst in 1981, NOESY reveals which protons are spatially close in the three-dimensional structure, independent of bonding connectivity. This makes NOESY invaluable for determining molecular conformation, assigning stereochemistry, and elucidating protein folds. | Correlation Spectroscopy (COSY) is a two-dimensional NMR technique that correlates proton chemical shifts through scalar coupling (J-coupling), revealing which protons are magnetically coupled and hence bonded through multiple bonds. Developed by Aue, Bartholdi, and Ernst in 1976, COSY became one of the most important tools in structural elucidation, enabling chemists to map out proton connectivity patterns and deduce molecular topology without isotopic labeling. | The spin-echo is a fundamental nuclear magnetic resonance (NMR) pulse sequence technique introduced by Erwin Hahn in 1950. It uses a 90-degree radiofrequency pulse followed by a 180-degree refocusing pulse to create an echo, effectively reversing the effects of magnetic field inhomogeneities and allowing accurate measurement of spin relaxation properties. This technique is essential in modern NMR spectroscopy for both one-dimensional and multidimensional experiments. |
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