Analytical Techniques Flashcards
What happens in infrared spectroscopy?
A beam of IR radiation is passed through a sample of the chemical.
What type of bond absorbs the IR radiation?
Covalent bonds
What increases the vibrational energy in covalent bonds?
The IR radiation.
Do bonds between different atoms absorb the same frequency?
Bonds between different atoms absorb different frequencies of IR radiation.
Does it matter where the bonds are in a molecule?
Bonds in different places in a molecule absorb different frequencies.
What is the frequency of a C-H functional group?
2850-3100
What is the wave number of an O-H functional group in alcohols?
3200-3600
What is the wave number of the O-H functional group in carbonyl in acids?
2500-3300
What is the wave number of a C=O bond?
1630-1820
Where is the C-H functional group found?
Alkyl groups
Aliens
Arenes
Where is the O-H functional group found?
Alcohols
Carboxylate acids
Where is the C=O functional group found?
Aldehydes
Ketones
Carboxylic acids
Esters
What do the upside down peaks on the spectrum show?
These show where radiation is being absorbed.
