NMR Broad Band Spectrometer

1
NMR Broad Band Spectrometer

• Slide show by
• Mike Condren
• Spectra Collected by
• Craig Bradley
• of Anasazi Instruments

2
All Spectra Shown is for One Sample

• The spectra of (n-Bu)3Sn-Si(CH3)3
• was collected on our Anasazi EFT-60
• FT-NMR Spectrometer
• H-1 spectra
• DEPT C-13 Spectra
• C-13 Spectra
• Si-29 Spectra
• Sn-117/Sn-119 Spectra

3
H-1 Spectra
(CH3-CH2-CH2-CH2)3Sn-Si(CH3)3 d g b
a e
e
Coupled to 117Sn 119Sn
d
Coupled to 29Si

a, b, g
4
DEPT C-13 NMR Spectra
Distortionless Enhancement by Polarization
Transfer (DEPT Spectroscopy)

• Type C CH CH2 CH3
• 135o 0 -
• 90o 0 0 0
• 45o 0
• Normal

5
DEPT C-13 Spectra
(CH3-CH2-CH2-CH2)3Sn-Si(CH3)3 d g b
a e
g
b
d
a
e
6
C-13 Spectra
(CH3-CH2-CH2-CH2)3Sn-Si(CH3)3 d g b
a e
Coupled to both Sn nuclides
Coupling to 119Sn
Coupling to 117Sn
a
d
b
g
e
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Changing to another Nucleus

• Takes less than 5 minutes
• Begin by typing the nucleus to be analyzed into
  the computer
• Follow instructions on the upper right corner of
  monitor

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Modifications to the Magnet Consol
9
Equipment for Changing Frequency
10
Probe Area
11
Sn-117/Sn-119 Spectra
(CH3-CH2-CH2-CH2)3Sn-Si(CH3)3 d g b
a e
Spinning side bands
Coupled to 29Si
Coupled to g C
Coupled to a C

b C and e C on Si
12
Si-29 Spectra
(CH3-CH2-CH2-CH2)3Sn-Si(CH3)3 d g b
a e
Coupling to 119Sn
Coupling to 117Sn