HNMR
This provides the ratio of hydrogen atoms in HNMR
What is integration?
The physical property possessed by nuclei that have either odd mass or an odd atomic number.
What is spin?
This tallest GC-MS peak represents the most abundant ion formed.
What is the base peak?
Compounds that are IR active absorb electromagnetic radiation in this region of the electromagnetic spectrum.
What is the infra-red region?
The solvent leading to a uniform triplet at 77 ppm in CNMR
What is CDCl3?
Atoms possessing identical chemical environments and experience the same chemical shift are said to be ______.
A ratio of the magnetic moment and angular momentum.
What is the Gyromagnetic ratio?
A compound with an even number of nitrogens will have an even mass.
What is the nitrogen rule?
Compounds containing bonds that are IR active possess this physical property that changes as a function of time.
What is a dipole moment?
A two-dimensional experiment that provides information about proton-proton correlations.
What is a COSY?
Neighboring spins affecting the multiplicity of another atom’s peak.
What is spin-spin splitting?
What is coupling?
The frequency at which a nucleus precesses.
What is the Lamor Frequency?
A charge-site-induced cleavage involving 2 electrons with a preference for heteroatoms.
What is inductive cleavage?
Vibrations, such as rocking, wagging, scissoring, and twisting, give rise to these types of absorptions.
What are fundamental absorptions?
CNMR spectra are often too complicated for assessment unless this procedure is used.
What is decoupling?
An electron generates its own magnetic field when processing around an atom exposed to an external magnetic field. This causes the neighboring proton to be shielded from the external magnetic field.
What is local diamagnetic shielding?
A process in which all nuclei are excited with one pulse leading to convoluted frequencies that require a Fourier transformation prior to spectral analysis.
What is pulse NMR?
A process by which an unsaturated six-member ring cleave.
What is a retro Diels-Alder reaction?
Absorptions bands associated with integral multiples of fundamental absorptions.
What are overtones?
This gives a three-fold signal enhancement in CNMR following the decoupling of protons.
What is the Nuclear Overhauser effect?
A constant describing the influence of a proton’s spin on another proton three or more bonds away.
What is the coupling constant?
The difference between populations increases as the magnetic field strength increases.
What is the Boltzmann distribution?
Fragmentation leads to the formation of the most stable ions.
What is Stevenson’s rule?
This resonance is observed when fundamental vibrations couple with a combination band or an overtone.
What is fermiresonance?
A two-dimensional experiment that provides information about spatial proximity.
What is a NOESY