The XeF+ or Xe2F,+ cations react with HC=N in anhydrous HF solvent to give the Lewis acid-base adduct cation HC=NXeF+. The HC=NXeFt cation has been characterized in HF and BrF, solvents by Iz9Xe, I9F, 14315N, I3C, and 'H NMR spectroscopy and has been characterized as its AsFc salt in the solid state by low-temperature Raman spectroscopy. The scalar couplings, IJ(lZ9Xe-l4N), zJ(129Xe-13C), and 3J(129Xe-'H), represent the first examples of couplings observed between these nuclides. The vibrational assignments of the v(Xe-N) stretching and b(XeNC) and b(FxeN) bending modes have been aided by obtaining Raman spectra for natural-abundance 15N-and I3CC-enriched HC=NXeFAsF6-. The solution NMR and low-temperature Raman spectroscopic studies are consistent with a linear C, , structure for the HCSNXeF' cation. The vibrational data together with the NMR chemical shifts indicate that the Xe-N bond is weakly covalent and are in agreement with recent theoretical calculations. NMR spectroscopic studies also show that solutions of HeNXeF+AsF6in HF are extensively solvolyzed to give equilibrium concentrations of the HC=NH+ cation and XeF2.
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