NMR: Difference between revisions
From Pumping Station One
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* TMS - Tetramethylsilane Si(CH3)4 - A colorless liquid commonly used as a reference standard. The peak of TMS is used to set a reference of where zero is. | * TMS - Tetramethylsilane Si(CH3)4 - A colorless liquid commonly used as a reference standard. The peak of TMS is used to set a reference of where zero is. | ||
* PPM - The unit "chemical shift" is measured in when looking at NMR spectra (x-axis). This corresponds to the shift from the reference frequency from 0ppm. | * PPM - The unit "chemical shift" is measured in when looking at NMR spectra (x-axis). This corresponds to the shift from the reference frequency from 0ppm. | ||
* Upfield / Shielded / Lower Energy - Peaks occurring closer to 0ppm (near the right side of x-axis). | * Upfield / Shielded / Lower Energy - Peaks occurring closer to 0ppm (near the right side of x-axis). They require less energy to bring them into resonance. | ||
* Downfield / Deshielded / Higher Energy - Peaks further left on the x-axis (away from 0ppm). | * Downfield / Deshielded / Higher Energy - Peaks further left on the x-axis (away from 0ppm), require more energy to bring them into resonance. | ||
== History == | == History == | ||
