Lecture4 - CHEMISTRY
30B
 ORGANIC
CHEMISTRY
...

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Unformatted text preview: CHEMISTRY
30B
 ORGANIC
CHEMISTRY
 Lecture
4
 No#ces
and
ques#ons….
 My
office
hours
are
today
at
2pm
in
MolSci
5241
 (go
to
fi3h
floor
of
Young
Hall,
go
South
into
 Molecular
Science
Building,
walk
around
 outside
corridor
un#l
you
get
to
the
corridor
 running
East‐West.

This
corridor
has
faculty
 offices
and
restrooms
on
the
South
Side,
and
 5241
is
near
the
middle
on
the
North
side)
 What
do
we
need
to
know
about
IR?
 Do
we
need
to
memorize
IR
cm‐1
values?
 •  Example
problems:
 9/29/2008 What is this? hexane, 1-hexene, or 1-hexyne http://orgchem.colorado.edu/hndbksupport/irtutor/tutorial.html PATTERN RECOGNITION IN IR SPECTROSCOPY Fingerprint region, very messy (many normal modes, bending, a few stretching vibrations of bonds between "large" atoms, weak bonds with small force constant) MOST USEFUL REGION (many local stretching modes) C H H C Aromatic C A C N O H Broad 3500 N C C C B H 1ry one band 2ry two bands 3000 O 2000 ~1700 Very strong 1700 1200 C O C N C 1000 Cl 600 Func#onal
Group
Bands(cm‐1)
 (2
significant
figures)
 OH,
NH

 
3400
(broad
when
H‐bonded)
 CH
 
 
 
3300
(sp‐H)

 
 

 



3100(sp2‐H)
 
 

 
 
2900(sp3‐H)
 RCCH,
RCN
 
2200
 arene
 
 
1800(mul#ple
bands)
 C=O 
 
1700
 C=C
 
 
1650
 CH2
(bends)
 
1500
 CH3
(bend)
 
1400
 C‐O
 
 
1100
 C‐Cl 
 
600

 KNOW THESE “Where
in
the
world
is
Professor
Garcia‐Garibay?”
 working
hard,
in
……..
 LAST
MONDAY
 LAST
FRIDAY
 LAST
FRIDAY
 YESTERDAY
 WEDNESDAY
 and
 TODAY
 TUESDAY
 •  
 •  •  
 
 
 University
of
Fribourg
 Chemistry
Department

 Ch.
du
Musee
9

 CH‐1700
Fribourg
 SWITZERLAND

 tel

+
41
26
300
87
00
 fax
+
41
26
300
97
38

 email 
Welcome
to
the
CHEMISTRY
DEPARTMENT 
people



unifr.ch

ACTUAL
 La
Chimie
de
tous
les
jours

 Le
cours
expérimental
"La
chimie
de
tous
les
jours"
est
ouvert
au
public,
chaque
semaine
le
mercredi
soir.
>>Special
issue
of
 Universitas
on
nano‐technologies

 Check
out
the
conCbuCons
from
Profs
Katharina
Fromm,
Michael
Allan
and
Titus
Jenny
!
>>Xmas
party
2008

 Check
out
the
pictures
from
the
KRYPTONIA
>>
 Société
Fribourgeoise
de
Chimie
 Freiburger
Chemische
GesellschaW
 Fribourg
Chemical
SocietyMOVIES 

 >
Nouveaux
Etudiants
 >
Neue
Studenten>
Bachelor>
Master>
GESTENS
 •  •  Upcoming
Seminars
 Friday
02
October,
16:30
Prof.
Miguel
Garcia‐Garibay,
Amphidynamic
Materials
and
Crystalline
Molecular
Machines
 •  Tuesday
13
October,
17:15
Prof.
Hans
Ulrich
Güdel,
Making
lightThursday

 •  15
October,
16:30
Prof.
Yasuhisa
Mizutani,
Protein
dynamics
as
revealed
by
Cme‐resolved
resonance
Raman
spectroscopy 

 This
and
next
3
lectures

 are
on

 NMR
spectroscopy
 Chapter
13
 pure
liquid,
or
 solu#on
in
non‐protonic
solvent
 CCl4,
CDCl3,
CD3SOCD3,
D2O,
etc.

 hν !( ) Energy difference between ! and " spins 300
MHz
 800
MHz
 "( ) 7.1T
 18.8T
 Increase Magnetic Field (Bo) Internal

 Effects
 Energy difference between ! and " spins 1H
 !( ) 300
MHz
 75MHz
 If your nuclueus has lower symmetry (small #) 13C
 !( ) 200MHz
 800
MHz
 "( ) "( ) Increase Magnetic Field (Bo) Measures
of
Magne#c
Field
Strength
 











Gauss,
Tesla
 1
tesla
=
10,000
gauss
 Earth's
magne#c
field
measures
about
0.5
 gauss,
a
small
iron
magnet
has
a
field
of
about
 100
gauss,
a
small
neodymium‐iron‐boron
 (NIB)
magnet
has
a
field
of
about
2,000
gauss,
 a
big
electromagnet
has
a
field
of
about
15,000
 gauss,
and
the
surface
of
a
neutron
star
has
a
 field
of
about
1012
gauss
 hfp://www.youtube.com/watch? v=gt8Y93k0pB0
 Nikola
Tesla
(10
July
1856
–
7
January
1943)
 inventor
and
a
mechanical
and
electrical
engineer.
He
is
frequently
 cited
as
one
of
the
most
important
contributors
to
the
birth
of
 commercial
electricity
and
is
best
known
for
his
many
revolugonary
 developments
in
the
field
of
electromagnegsm
in
the
late
19th
and
 early
20th
centuries.
Tesla's
patents
and
theoregcal
work
formed
the
 basis
of
modern
alternagng
current
(AC)
electric
power
systems.
 NMR
 ROESY
 DOSY
 EXSY
 INADEQUATE,
etc.
 (CH3)4Si
(tetramethylsilane)
 
resonance
 














Chemical
Shi3
=
(shi3
observed/frequency)
x106
=
δ(ppm)

 ...
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This note was uploaded on 02/05/2010 for the course CHEM 30B Chem 30B U taught by Professor Miguelgarciagaribay during the Fall '10 term at UCLA.

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