Class notes

IR Spectroscopy - Organic Chemistry

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Course
CHEM 281 (CHEM281)

Institution
Simon Fraser University (SFU )

Condensed class notes from lectures about identification using IR spectroscopy, Includes typical peaks for important functional groups.

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Uploaded on January 18, 2024
Number of pages 1
Written in 2023/2024
Type Class notes
Professor(s) David vocadlo
Contains Class 16

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foreTrowe Furon
D IRUSES
Iderify DiffERENs Sher CHARACTERt

groups Groups
To .

e
-

PERKS IN THE I R SPECTRUM THIS BECAUSE BONDS UBRATE ! M'S And
REALLY
STRETCHG
.
IS MORE LIKE WE can

Like A ! THE BOLD) THE MORE RAPID THE BROW

spray STRONGER SPRING
PreTURE THE
-
o ,

SPECTROSCOPY
MASS THE CAN Also AFFECT WBRATON A SMAKER MASS (LOWER ASMRC MEMBER

SPRING
ON S .

FASTER POLAR BordS SHOW of AsorpTror
GREATER MENSTY
will B R E As WELL .

peaks)
Larger
.

(3 of Which from CM
"Type" of
Hydrogen Regrow
IRSPECTRAHAVE COVEREDMS) 3600 WHERE Each
REgrows
PRE .
-
2700 is The

FOLLOWING
Bond
IMMEDIATELY
PROTON EMAS A
Hydrogen Regrop
CHARACTERISTIC PEAK
Regrow
, THE Is THE
TRLE

WHICH SpANS from 2700 1900 CM" WHERE Differen Of TRIPLE Bowds EMM A CHARACTERISTIC PEAk NEXT Is THE DOUBLE Bond
TypES
-
.

from

Regrow
1900 -
1500 c WHERE DOUBLE Bord peees appear
.

3500 2000 2500 2000 isoo 1000 soo

IR
SPECTROSCOPY WORKS BECAUSE BONDS BETWEEN OF CORRESPONDS
LENGTH FREQUENCY
ACOMS ABSORB THE WAVE THAT

LIGHT
Of THE BONDS ALT LIKE Bord
FREQUENCY
HrgHER
WITH THE VABRATTONAL THE MOLECULE So The SHORTER The The The
SPRINGS ,
.

By ar
THISger for Amrde LIBRATONAL
FREQUENCY .
SAME WITH ACOMS OF A SMAKER MASS . VIBRATONA
FREQUENTY A WHOMELENGTH/FREQUENCY ARE
O
1 AmmE (R-NHz)
y
DIRECTLY RELATED HOWEVER
ENERGY INVERSELY
. IS RELATED .

/

M
Zur
EXYX

- -
&urgit& X insiesirou
I
3500 isoo
I I
3000 2500 2000

28 Amme (R2-1)
&

&
&↑

IR is not exact dis often used no Tandem WTH "H NMR in order TO
Actually
.
identify A compound
-T
2000 2500 o
2000 1500
,

foundations of FR :

⑳
j

M
-

W-
I Ga off
THIS US THE PEAK from A
Hydroxyl
This IS A
Carboxylic Add Pear . Note The Distinctive
Group . NOTE THE
RELATELY Brand ,

Breaked
jagged Hydrogen
a
peak around 3000 no The
Round Around 3300 at
Peak

Skinny peak around
Regrow
And THE 1800

long
J ,

-T oo
I
250 1500 TE DOUBLE Bond
Regrows
3000 2000 No .

soo 300

8

T
Bo
=
THESE PEARS F rom A n ESTER
ARE

group
.

n
NOTE How

DOUBLE Bond
is
only shows up No THE

p
REgren
BECAUSE THERE

-500 1500
-
2000 2500 2000
Hydrog
ARE -
isoo
↑ I
2500
NO Ens

3500 3000 2000

O
6 O

THE
T
Medeyde
Belongs
an
Pear To ,

* This Pear => s THE DOUBLE Band

Ringrow strongly
PEAK
Belongs
to NO

T A KETONE. M Looks
NEARLY idENTICAL TO THAT RESEMBLES That of
The
CarbonyGre Hard

In
of An

Hydrogen Regrow
C-I But r is
ESTER ,
THERE S A SMAR peak No The

SMALL BECAUSE THERE IS NO
DiPOLE .

-T
2000 2500 o
2000 1500

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