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Terms in this set (32)
accidentally equivialent nuclei
nuclei that are nonequivalent by NMR yet absorb at nearly the same chemical shift and are not resolved.
chemically equivalent atoms
atoms that cannot be distinguished chemically
the difference between the resonance frequency of the proton being observed and that of TMS.
splitting by two or more different kinds of protons with different coupling constants
coupling constant (J)
The distance between two adjacent peaks of a multiplet
a method of running several ¹³C spectra with different pulse sequences so that the carbon atoms appear differently depending on whether they are bonded to 0, 1, 2, or 3 protons
Bonded to a group that withdraws part of the electron density from around the nucleus. More downfield on NMR
Nuceli that occupy diastereomeric positions.
at a lower value of the applied magnetic field, toward the left on the NMR spectrum.
Fourier transform spectroscopy
spectroscopy that involves collecting transients (containing all different resonance frequencies) and converting the averaged transients (containing all the different resonance frequencies) into a spectrum using the mathematical Fourier transform
the signal that results when many nuclei are irradiated by a pulse of energy and processed at their resonance frequencies.
a measure of the magnetic properties of a nucleus
induced magnetic field
the magnetic field set up by the motion of electrons in a molecular (or in a wire) in response to the application of an external magnetic field
the measure of the area under a peak, proportional to the number of protons giving rise to that peak
nuclei that are close enough that their magnetic fields influence each other, resulting in spin-spin splitting
the magnitude of a nuclear magnetic field, characterized by the gyromagnetic ratio
the medical term for NMR imaging. Use of field gradients in a large-bore magnet to scan two-dimensional slices of a patient's body
a group of peaks resulting from the spin-spin splitting of the signal from a single type of nucleus
has two peaks
has three peaks
has four peaks
a signal that is being split by N equivalent protons is split into a multiplet with N+1 individual peaks
nuclear magnetic resonance spectroscopy
a form of spectroscopy that measures the absorption of radio-frequency energy by nuclei in a magnetic field.
carbon magnetic resonance
NMR of the ¹³C isotope of carbon
proton magnetic resonance
NMR of protons
a technique used with ¹³C NMR in which only the protons directly bonded to a carbon atom cause spin-spin splitting
a measure of how slowly the nuclear spins return to their normal state after an RF pulse near their resonance frequency.
Surrounded by electrons whose induced magnetic field opposes the externally applied magnetic field.
elimination of spin-spin splitting by constantly irradiating of type of nuclei at its resonance frequency
(magnetic coupling) the interaction of the magnetic fields of two or more nuclei, usually through the bonds connecting them. Coverts a single signal to a multiplet
tetramethylsilane, an NMR standard whose absorption is defined as 0.00
at a higher value of the applied magnetic field, toward the right on the NMR spectrum
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