COSY and TOCSY NMR techniques differ in their detection of small couplings between protons.

the verdict

SUPPORTED

the evidence backs this

Recorded sources

3 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

COSY and TOCSY NMR techniques are standard two-dimensional homonuclear correlation experiments that differ in how magnetization is transferred through scalar coupling networks, allowing them to probe different ranges of proton-proton couplings.

The analysis

The retrieved literature confirms that COSY and TOCSY are distinct two-dimensional NMR correlation techniques used for detecting scalar couplings (J-couplings) between protons. COSY detects through-bond correlations typically over two to three bonds (via active scalar couplings), whereas TOCSY transfers magnetization through an extended network of scalar couplings via isotropic mixing, enabling the detection of small or relay couplings across an entire spin system. While none of the papers explicitly debate or focus entirely on contrasting small-coupling detection as a sole thesis, textbook and methodological references ([0], [6], [8]) consistently describe them as having different transfer mechanisms and correlation patterns for J-couplings. Therefore, the claim is supported by standard NMR principles.

Evidence for · 3

In Vivo NMR Spectroscopy

Recorded source metadata

R. D. Graaf. In Vivo NMR Spectroscopy. 2019. https://doi.org/10.1002/9781119382461

Reviews basic principles of two-dimensional NMR including COSY and spin-echo or J-resolved methods used to evaluate scalar coupling and J-coupling differences.

Source citation format

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More for · 2

Complete 1H and 13C assignment of Lys and Leu sidechains of staphylococcal nuclease using HCCH‐COSY and HCCH‐TOCSY 3D NMR spectroscopy

Recorded source metadata

D.M. Baldisseri, J.G. Pelton, S.W. Sparks, D.A. Torchia. Complete 1H and 13C assignment of Lys and Leu sidechains of staphylococcal nuclease using HCCH‐COSY and HCCH‐TOCSY 3D NMR spectroscopy. 1991. https://doi.org/10.1016/0014-5793(91)80352-4

Compares HCCH-COSY and HCCH-TOCSY 3D NMR techniques for their distinct correlation capabilities in sidechain assignments.

Source citation format

Bimolecular Sandwich Aggregates of Porphyrin Nanorings.

Recorded source metadata

Gotfredsen H, Hergenhahn J, Duarte F, Claridge TDW, Anderson HL. Bimolecular Sandwich Aggregates of Porphyrin Nanorings.. 2024. https://doi.org/10.1021/jacs.4c09267

Utilizes both 1H-1H COSY and TOCSY alongside other methods as part of a suite where different coupling pathways are detected.

Source citation format

The paper trail · every fact has a biography

first checked01 Aug 2026

judged → SUPPORTED · 9001 Aug 2026

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