Fig. 13.1 NMRIRUV. Fig. 13.2 NMR: excited spin state IR: excited vibrational state UV: excited...
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Transcript of Fig. 13.1 NMRIRUV. Fig. 13.2 NMR: excited spin state IR: excited vibrational state UV: excited...
Fig. 13.1
NMRIRUV
Fig. 13.2NMR: excited spin stateIR: excited vibrational stateUV: excited electronic state
Fig. 13.30
Tab. 13.4
Fig. 13.31
“fingerprint region”
Fig. 13.32
Fig. 13.33
Fig. 13.34
Fig. 13.35
Which one of the following compounds is most consistent with the IR given?
OH
O
CH3
O
OH OH
IR: Isolation of Cinnamon Oil from CinnamonExp. [11C]
Mayo, pp. 213 – 218. Please note the prior reading assignments given on p. 213.
Your write-up should include the following:
• Data from the experiment including mass of oil, percent recovery from cinnamon, IR spectrum.
• Structure of cinnamon oil, with an analysis of the IR spectrum.• Problems 6-77, 6-78, 6-79, 6-80
Steam Distillation – http:wiley.com/college/chem/mayo321850/wave_s.html(under Reference Discussions pp. 27-30)
Fig. 13.1
NMRIRUV
Fig. 13.2NMR: excited spin stateIR: excited vibrational stateUV: excited electronic state
Fig. 13.3
• The lower energy orientation is the oneparallel to Ho and more nuclei havethis orientation.
Fig. 13.4• The energy difference in the two spin statesis proportional to the strength of the appliedfield.
4.7 Tesla - 200MHz (radiofrequency)
Fig. 13.5
Source of energyto excite nucleus
Aligns nuclear spins
Contains sample,may have deuteratedsolvent
Detects theabsorption of rf radiation
Fig. 13.23a
• Number of signals – number of nonequivalent protons (H)
• Chemical shift – electronic environment of the proton, represented by ppm• Integration – number of equivalent protons (H), represented as area beneath the curve• Multiplicity – number of protons (H) on the adjacent positions
Fig. 13.6
• Alone, a proton would feel the full strengthof the external field, but a proton in anorganic molecule responds to both theexternal field plus any local fields withinthe molecule.
• Electrons “shield” the proton from thefull effects of the magnetic field.
Chemical Shift
Fig. 13.7 • Electron density “shields” theproton from the full effects ofthe external magnetic field.
H-C-CH-C-XH-C=CH-ArH-C=O
Chemical Shift
Tab. 13.1
H-C-X 2-5 ppm
Chemical Shift
Fig. 13.11
Integration
Integration
C8H8O2
http://www.chem.ucla/~webspectra
Fig. 13.12
Multiplicity
n+1 Rule - A signal is split into n+1 peaks,where n=number of adjacent protons (H)
Fig. 13.15
C2H5Br
2
3
Deduce structure of :
Fig. 13.17
1 H
6 H
Deduce structure of C3H7Cl
Fig. 13.19
Fig. 13.20
Fig. 13.21
-OH protons areexchangeable
Fig. 13.22
Tab. 13.3
Fig. 13.23b
Fig. 13.24
Fig. 13.25
Fig. 13.26a
Fig. 13.26b
Fig. 13.28
Fig. 13.29
Fig. 13.37
Tab. 13.5
Fig. 13.38
Fig. 13.39
Fig. 13.40
+ e- .+ + 2e-
M+
base peak
Fig. 13.41
chlorobenzene
Fig. 13.42
decane base peakM+
molecular ion peak
Fig. 13.43
propylbenzene
Fig. 13.44
GC-MS
Spectra for homework problems at the end of Chapter 13 -
Fig. 13.45
Fig. 13.46a
Fig. 13.46b
Fig. 13.47a
Fig. 13.47b
Fig. 13.48a
Fig. 13.48b
Fig. 13.49a
Fig. 13.49b
Fig. 13.49c
Fig. 13.49d