NDLI: Proton NMR Spectroscopy

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Mass Spectrometry and Infrared Spectroscopy

NMR Spectroscopy

Proton NMR Spectroscopy

Parts Per Million in NMR Spectroscopy

Parts Per Million in NMR Spectroscopy Example

Chemical Shift and Shielding Effect

Proton NMR Spectrum

Electron Shielding Groups

Aromatic Hydrogens and Electron Withdrawing Groups

Proton NMR Spectrum Example

Spin-Spin Coupling

Spin-Spin Coupling Example

Spin Coupling Constant

Spin Decoupling of Alcohols

Decoupling by Irradiation

Proton NMR Spectroscopy

Content Provider	AK Lectures
Description	Proton NMR spectroscopy is a technique that is used in organic chemistry to study hydrogen-containing molecules. It uses a principle that comes from nuclear physics known as nuclear magnetic resonance. Just like electrons, protons contain charge that can spin and this will induce a magnetic dipole moment. When the proton is placed into an external magnetic field, the proton's magnetic dipole moment will orient itself along that magnetic field. However, since the proton can spin in one of two ways in any external magnetic field, it has two magnetic dipole moment orientations and so will align with the external magnetic field in one of two ways. One of these orientations will be along the same direction as the magnetic field and this is known as the spin-up (+1/2). This will be the lower in energy and more stable spin state. The other orientation will be along the same axis as the magnetic field but in the opposite direction and this is known as the spin-down state (-1/2). This will be the higher in energy and less stable quantum spin state. If we now direct electromagnetic waves (radiofrequency waves) with just the right frequency at the spin-up state, the spin-up proton will absorb energy and transition (flip) to the spin down state. At this point it is said to undergo resonance and this frequency is known as the resonance frequency or chemical shift. Different hydrogens in molecules can have different chemical shift values and these values can be readily determined by using this nmr technique. This type of technique that uses nuclear magnetic resonance to study the protons (hydrogens) is known as proton nmr spectroscopy.
Language	English
Access Restriction	Open
Subject Keyword	Organic Chemistry chemistry study values molecules quantum hydrogens frequency
Content Type	Video
Educational Role	Teacher Student
Educational Use	Self Learning Lecture Reading
Resource Type	Video Lecture
Education Level	Under Graduate
Subject	Physical chemistry

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