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13 Cards in this Set
- Front
- Back
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The range of radiofrequency of NMR |
0.1 to 100 MHz wavelength |
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True/False: Unlike UV, visible and or infrared spectroscopy NMR does not involved electron or bonds but the nuclei of the compound |
TRUE |
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True/False: An odd sum of protons and neutrons have magnetic moments: 1H and 13C |
TRUE |
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Most common reference material in NMR |
Tetramethyl silane or TMS |
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Solvents in NMR |
CCl4 - Carbon tetrachloride CS2 - Carbon disulfide CDCl3 - Deuteriochloroform C6D6 - Hexadeuteriobenzene D2O - Deuterium oxide |
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What is the the chemical shift of TMS? |
Zero |
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What are the physical properties of nuclei process? |
1) Spin; 2) Nuclear magnetic moment |
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Both energy levels become equally populated with a slight excess of protons in the lower energy levels |
SATURATION |
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Involves exchange of energy between two proximal processing nuclei |
Spin-spin Relaxation (Transverse) |
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Transfer of energy to lattice components as nuclei returns from higher to lower spin state |
Spin-lattice Relaxation |
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The applied magnetic-field strength at which a given nucleus in a molecule absorbs energy relative to an arbitrary reference. Expressed as "delta" values in parts per million (ppm) |
Chemical shift |
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Formation of multiplets in the delta scale (NMR spectrum) |
Spin-spin Coupling |
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Indicates the electron density around various hydrogen nuclei and therefor helps to identify proton type |
Chemical shift |
