MODERN ANALYTICAL TECHNIQU
INFRARED IR) SPECTROSCODY
trave susive than over rests
vibrational energy of covalent bonds in a sample peals can disappear whe
oxidised!
W
FREQUENCY OF IR ABORBED DEPENDS ON :
↳ atoms either side of the bond Imass)
↳ the bond within the
position of Molecule
·
↳ band strength
↳ type of vibration
/or polar bands) absorb IR radiation
O
>
polar moles
·
~
non-polar molecules do not absorb In radiation
broad peal signals -
on O
WAVENUMBER
MASS SPECTRA In
BUTANOIC ACID
nnH
3300 25
10
-
1725-17
n - c -
- c -
c
↓ in or
non-fragmented BUTANONE
- molecular ion
-My
20
-
S
peal
I same a Mr)
M +1
- 2-methylpropan-2-o
M/2
!
3540 4S 50 3750 -
3
I most have a +1
charge so this
value will be the same as fragment mass)
FRAGMENTATION
most stable and
1
Relative abundant fragment
Abundance
&
TALLEST
PEAU
+
CHz(H2
⑭ 3 major peans
only +rively charged
↳
fragments will be
+
detected CH3
CH3C
INFRARED IR) SPECTROSCODY
trave susive than over rests
vibrational energy of covalent bonds in a sample peals can disappear whe
oxidised!
W
FREQUENCY OF IR ABORBED DEPENDS ON :
↳ atoms either side of the bond Imass)
↳ the bond within the
position of Molecule
·
↳ band strength
↳ type of vibration
/or polar bands) absorb IR radiation
O
>
polar moles
·
~
non-polar molecules do not absorb In radiation
broad peal signals -
on O
WAVENUMBER
MASS SPECTRA In
BUTANOIC ACID
nnH
3300 25
10
-
1725-17
n - c -
- c -
c
↓ in or
non-fragmented BUTANONE
- molecular ion
-My
20
-
S
peal
I same a Mr)
M +1
- 2-methylpropan-2-o
M/2
!
3540 4S 50 3750 -
3
I most have a +1
charge so this
value will be the same as fragment mass)
FRAGMENTATION
most stable and
1
Relative abundant fragment
Abundance
&
TALLEST
PEAU
+
CHz(H2
⑭ 3 major peans
only +rively charged
↳
fragments will be
+
detected CH3
CH3C
