Mercury-199, chemical shift determination

The degree of deacetylation (DD) of chitin/chitosan samples was successfully determined using NMR spectroscopy. Chitin/chitosan samples were dissolved in a mixture of 25% DCl in D2O and chitosan samples in a mixture of 0.25% DCl in D2O. The concentration of chitosan in the solution was about 0.5% (w/v). The NMR spectra were recorded using a Varian Mercury 400 MHz spectrometer (Fig. 2.35). Table 2.20 shows the chemical shifts of chitin/chitosan protons in D2O/DCI at 70 °C. The DD values were calculated using integrals of the peak of proton HI of... 

Chemical shifts and coupling constants have been determined in for example cyclopropyl magnesium bromide and the compounds formed with gallium, silicon, mercury, tin and lead. A complete analysis of the metal satellite spectra of tetracyclop-ropyl lead and tin and dicyclopropyl mercury has been presented ... 

Dean et al. (65) have prepared organometallic mercury (2+) compounds of the type Hg2(AsF6)a Arene. The NMR spectra of these complexes exhibit averaged arene carbon signals due to rapid free-complexed arene exchange at NMR probe temperatures. On the basis of the variation of the aryl carbon chemical shift with the arene/Hg22 ratio for the system Hg2(AsFe)2-hexa-methylbenzene (HMB) the existence of the following two equilibria was determined ... 

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