Orgo Ch 12 Ppt
Card Set Information
Orgo Ch 12 Ppt
Frequency of absorption is measured in __ (___.
Wavelength units typically are __.
Frequency units are typically measured in __.
Mid-infrared frequency range is __.
microns (10,ooo microns= 1cm)
__ are higher than corresponding __ frequencies. (It is easier to __ a bond than to __ or __ it.)
Bonds to hydrogen have __ than those of heavier atoms.
Triple bonds have __ than corresponding double bonds, which in turn have __ than single bonds (except for bonds to hydrogen).
higher stretching freq. x3
Which has the higher frequency in terms of tetrahedral carbons?
sp> sp2> sp3
Infrared (IR) spectroscopy measures what?
Mass spectrometry __.
Nuclear magnetic resonance spectroscopy __.
UV spectroscopy uses __.
the bond vibration frequencies in a molecule and is used to determine the functional group.
fragments the molecule and measures the masses
detects signals from hydrogen atoms and
can be used to distinguish isomers
electron transitions to determine bonding patterns
Frequency and wavelength are __.
__, where c is the __.
Energy per photon= __, where h is __.
c= hv, where c is the speed of light
The IR Region
- Just below __ in the visible region.
- Wavelengths usually 2.5-25 um.
- More common units are __, the reciprocal of the __ in centimeters.
- __ are proportional to __ and __.
__ vibrate at only certain allowable frequencies.
Frequency decreases with __.
Frequency increases with __.
increasing atomic weight
increasing bond energy
__ with n atoms usually has __.
3n-6 fundamental vibrational modes
__ and __ are also quantitized.
No two molecules will give exactly the same __.
Whole-molecule vibrations and bending vibrations