Abstract
Abstract : Helium (I) ultraviolet photoelectron spectra (UPS) are reported for the compounds CR(NPr2)3, Cr(NEt2)4, Mo(NME2)4, Mo(NEt2)4, Nb(NMe2)5, and Ta(NMe2)5. The interpretation of the UPS of the paramagnetic dialkylamide, Cr(NPr2)3, was aided by a scattered wave calculation on the model compound Cr(NH2)3. In contrast to previous UPS work on Cr(N(SiMe3)2)3, ionizations are detectable from the metal MO's of Cr(NiPr2)3. The UPS of the tetracoordinate molybdenum compounds, Mo(NR2)4, R=Me, Et are in excellent agreement with X-ray crystallographic data on Mo(NMe2)4 and exhibit a low energy ionization (approx. 5.3 eV) which is attributable to electron ejection from the essentially pure Mo 4d(x)2(-y)2 MO of b(1) symmetry. The pentacoordinate compounds, M(NMe2)5, M=Nb, Ta exhibit very similar UPS and therefore appear to be isostructural in the vapor phase.
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