NMR Impurity Solver
Identify unknown peaks in your spectra instantly.
± 0.05 ppm
Solvent Properties
CDCl3
Boiling Point
61.2°C
Density
1.5 g/mL
Residual Proton
7.26 ppm
Water Peak
1.56 ppm
Why use this tool?
- Faster than PDF tables
- Smart fuzzy matching
- Mobile optimized
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Input SignalPossible Matches
0 foundEnter a peak shift to view impurities.
How to use
- Select your solvent: Choose the deuterated solvent you used for your NMR experiment (e.g., CDCl3).
- Enter the shift: Type the chemical shift (ppm) of the unknown peak you see in your spectrum.
- Adjust tolerance: Use the slider to widen or narrow the search range (default is ±0.05 ppm).
- Identify: Review the list of possible impurities. Matches are sorted by how close they are to your input.
Frequently Asked Questions
Where does this data come from?
Data is adapted from the standard reference: Fulmer et al., Organometallics 2010, 29, 2176–2179. We have digitized the tables for water, grease, and common laboratory solvents.
Why isn't my peak showing up?
This tool contains the ~40 most common impurities. If your peak isn't listed, it might be a less common compound or a product peak. Also, check if your solvent referencing is correct (e.g., TMS at 0.00 ppm).
Data Source: Fulmer et al., Organometallics 2010.
This tool finds approximate matches. Always verify with original spectra.