文档介绍：Nuclear ic Resonance
Chapter 13
ic Radiation
ic radiation: light and other forms of radiant energy = c & E = h
Wavelength (l): the distance between consecutive identical points on a wave
Frequency (n): the number of full cycles of a wave that pass a point in a second
Hertz (Hz): the unit in which radiation frequency is reported; s-1 (read “per second”)
ic Radiation
Wavelength
Molecular Spectroscopy
We study three types of molecular spectroscopy
A pictorial view of UV/Vis
UV/Vis radiation is measured in nm
(wavelength)
IR Spectroscopy
IR radiation is measured in cm-1
This is actually a frequency. Remember that frequency and wavelength are inversely proportional.
NMR Spectroscopy
NMR uses radiowaves, measured in MHz
Nuclear Spin States
Any atomic nucleus that has an odd mass, an odd atomic number, or both has a spin and a resulting nuclear ic moment.
The allowed nuclear spin states are determined by the spin quantum number, I , of the nucleus.
A nucleus with spin quantum number I has 2I + 1spin states. If I = 1/2, there are two allowed spin states
Molecular Spectroscopy
Nuclear ic resonance (NMR) spectroscopy: a spectroscopic technique that gives us information about the number and types of atoms in a molecule, for example, about the number and types of
hydrogens using 1H-NMR spectroscopy
carbons using 13C-NMR spectroscopy
phosphorus using 31P-NMR spectroscopy
Nuclear Spin States
Spin quantum numbers and allowed nuclear spin states for selected isotopes of mon pounds