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Spectoscopic Methods
Infrared absorptions by functional group
10
Chemistry
Undergraduate 4
09/23/2012

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Term
n-Alkanes
Definition
C-H: 3000-2840 cm-1
Methyls: 2962 and 2872 cm-1, 1375 and 1450 cm-1
Methylene: 1465 cm-1
Term
Branched-chain alkanes
Definition
Strong doublet @ 1385-1350 and 1370-1365 cm-1
Term
Vinyl Group
Definition
1640 cm-1
Term
Alkene
Definition
C-H stretch: 3000 cm-1
Term
Conjugated Olefin
Definition
1625 cm-1
Term
Allenes
Definition
2000-1900 cm-1
Term
Alkynes
Definition
Weak band @ 2260-2100 cm-1
C-H 3333-3267 cm-1
Term
Mononuclear Aromatic Hydrocarbons
Definition
Aromatic C-H 3100-3000 cm-1
Term
Alcohols and Phenols
Definition
O-H: broad band @ 3200-3550 cm-1
C-O: 1200-1000 cm-1
Term
Ethers and Peroxides
Definition
aliphatic ethers: 1150-1085 cm-1
Alkyl ethers: 1275-1200 and 1075-1020
perooxides: 1198-1176
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