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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Analysis of uranium azide and nitride complexes by atmospheric pressure chemical ionization mass spectrometry.

Atmospheric pressure chemical ionization mass spectrometry (APCI-MS) has been used to characterize the air-sensitive paramagnetic organouranium azide and nitride complexes [(C5Me5)2UN3(mu-N3)]3 and [(C5Me5)U(mu-I)2]3N, respectively. The trimetallic complex [(C5Me5)U(mu-I)2]3E had been identified by X-ray crystallography, but the data did not definitively identify E as N3- versus O2- or (OH)-, a common problem in heavy-element nitride complexes involving metals with variable oxidation states. A comparison of the 250 degrees C APCI-MS spectra of products made from NaN3 and Na15NNN showed mixed [M]+ and [M + H]+ envelopes at expected ion intensities for the 14N and 15N isotopomers. A compilation of U-C(C5Me5) and U-I bond distance data for U3+ and U4+ is also reported that shows that the ranges for the two oxidation states have significant overlap.[1]

References

  1. Analysis of uranium azide and nitride complexes by atmospheric pressure chemical ionization mass spectrometry. Evans, W.J., Miller, K.A., Ziller, J.W., Greaves, J. Inorg. Chem (2007) [Pubmed]
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