IR/MS

Fingerprinting Region
Portion of IR between 600 and 1400, where many complex vibrations occurs; so named because no 2 compounds have exactly the same absorptions in this region
IR Active Vibration
vibration that changes the dipole moment of the molecule and thus can absorb infrared light.
Conjugated double bonds
double bonds that alternate between single bonds, so their pi bonding orbitals can overlap with each other
Radical Cation
A positively charged ion with an unpaired electron; commonly formed by electron impact ionization, when the impinging electron knocks out an additional electron
Base peak
Strongest peak in the mass spectrum
Molecular ion/ M+(Parent ion)
In mass spectroscopy, the ion with the same molecular weight of the original compound; no fragmentation has occurred
C-C
1200
C=C
1660
Aromatic: 1600
Isolated:1640-1680
Conjugated: 1620-1640
C-=C
<2200
sp3 C-H
2800-3000
sp2 C-H
3000-3100
sp C-H
3300
Alcohol O-H
Broad 3300
Acid O-H
broad 3000
Amine N-H
Broad 3300, with spikes
C=O
1710
Aldehyde C-H
2700, 2800
Carboxylic Acid O-H
broad 2500-3500
C-N
1200, strong
C=N
1660, strong
C-=N
>2200, strong
Br Mass Spec
M+2 as large as M+
Cl Mass Spec
M+2 1/3 as large as M+
I Mass Spec
At 127; large gap
N Mass Spec
odd M+
S Mass Spec
M+2 larger than usual (4% of M+)
x

Hi!
I'm Larry

Hi there, would you like to get such a paper? How about receiving a customized one?

Check it out