| Name | Properties | Advantages | Drawbacks |
|---|
| Deuterium Oxide (D2O) | Deuterium oxide, or heavy water, is a water-based deuterated solvent in which hydrogen atoms are replaced with deuterium. It is particularly useful for analyzing water-soluble natural products. The residual solvent peak in 1H NMR appears at δ = 4.79 ppm. | - Highly suitable for dissolving water-soluble compounds.
- Enables observation of exchangeable hydrogens (e.g., –OH, –NH groups), since these hydrogens undergo proton–deuterium exchange in D2O.
| - Limited to compounds soluble in water.
- The resonance of water and D2O is close, which can complicate spectral interpretation.
|
| Deuterated Chloroform (CDCl3) | Deuterated chloroform is one of the most commonly used solvents in NMR spectroscopy. Its residual solvent peak appears at δ = 7.26 ppm. It is relatively non-polar and can dissolve a broad range of natural products. | - Suitable for many non-polar and weakly polar compounds.
- Produces sharp and clear NMR spectra, making it ideal for structural analysis.
| - Toxic and requires careful handling and storage.
- Limited solubility for highly polar compounds.
- Trace amounts of water often present can cause minor signal interference.
|
| Deuterated Dimethyl Sulfoxide (DMSO-d6) | DMSO-d6 is a highly polar solvent with a residual solvent signal at δ = 2.50 ppm. It is capable of dissolving strongly polar and hydrogen-bonding compounds. | - Excellent solubility for polar compounds, including alcohols, acids, and peptides.
- Particularly valuable for compounds that cannot be dissolved in CDCl3.
| - Residual signal may overlap with analyte peaks, causing spectral complications.
- Exhibits stronger background signals compared to CDCl3, sometimes complicating interpretation.
|
| Deuterated Acetone (Acetone-d6) | Acetone-d6 provides a residual solvent signal at δ = 2.05 ppm. It is moderately polar, making it suitable for compounds with intermediate polarity. | - Useful for dissolving compounds of moderate polarity.
- Offers clearer NMR signals with fewer interferences compared to DMSO-d6.
| - Limited solubility for very polar compounds.
- Evaporates relatively quickly, requiring careful sample handling.
|
| Deuterated Methanol (CD3OD) | CD3OD is a polar solvent with a residual solvent peak at δ = 3.31 ppm. It is commonly used for dissolving polar organic compounds, particularly alcohols and phenolic compounds. | - Good solubility for many polar organic compounds.
- Can reveal proton–deuterium exchange signals in compounds containing labile hydrogens.
| - May interfere with analysis of highly polar or strongly hydrogen-bonded compounds.
- Exchangeable protons of the analyte may disappear due to exchange with the solvent.
|
| Deuterated Benzene (C6D6) | C6D6 is a non-polar aromatic solvent with a residual signal at δ = 7.16 ppm. It is well-suited for dissolving aromatic compounds and hydrophobic natural products. | - Excellent for studying aromatic compounds due to its compatibility.
- Produces relatively clean spectra with minimal interference.
| - Strong odor and potential health hazards.
- Limited solubility for polar compounds compared to CDCl3 or DMSO-d6.
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