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Germanium NMR

PHYSICAL PROPERTIES
 

Isotope
Natural 
Abundance
(%)
Nuclear
Spin
(I)
Magnetogyric
ratio
(107*rad/T*s)
Quadruple 
moment
(1028*Q/m2)
Resonance
frequency
(MHz)
at 11.744T
(500 MHz for 1H)
Relative 
sensitivity
(1H=1.00)
Absolute 
sensitivity
(1H=1.00)
73Ge
7.73
9/2
-0.9360303
-0.196
17.442
1.4*10-3
1.08*10-4
 

APPLICATION FIELDS

 73Ge NMR spectroscopy has been applied on some organometallics and inorganic germanium-containing compounds in very limited cases ( 87MGMC83 ). It suffers from the combined effects of broadened resonance signals owing to the fairly large quadrupolar moment and low sensitivity due to its low natural abundance and its low magnetogyric ratio. Good spectra have been obtained for arylgermane compounds ( 99ORG4317 ).
NMR REFERENCES
Neat GeMe4 is used as an external reference (absolute frequency of 3.488315 MHz with respect to 100.00 MHz of TMS). Also see IUPAC recommendations for reporting the NMR chemical shits of all nuclei relative to the 1H resonance of TMS (02JMR323-156).
NMR PARAMETERS
  • 73Ge chemical shifts ( 88JORC315 ). Values between -55 and -234 ppm has been determined in arylgermane compounds.
  • J(73Ge,X) coupling constants have been measured only in some favourable cases showing symmetrical environments. Recently, 1JGe-H coupling values in the range of 95-98 Hz have been measured for simple arylgermane compounds ( 99ORG4317 ).
    • NMR EXPERIMENTS
    1D 73Ge spectrum.
    2D 1H-73Ge HETCOR experiment.
    BIBLIOGRAPHY
    Interesting review: 96ENC2207 .
    Revision work: B79HAR309, 00ENC704 . Some works of interest: 87JCSD2365 and 99MRC418 .
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