Knowledge Bank

Low temperature argon matrices were prepared by passing $NFCl2$ in argon through a heated stainless steel metering valve and depositing the effluent on a KCl window maintained at 10K. Peaks at 920 and $720cm-1$ which could not be assigned to $NFCl2$, or to other known species (eg., NF, NCl, $N2$$F2$, $N2$$F4$, CLF, $NCl2$), appeared in the FTIR spectrum of the matrix. In previous $experiments,1$ $NCl2$ radicals had been produced in this manner from $NCl3$, and the assumption was made in these studies that the 920 and $720cm-1$ peaks were from NFCl. Normal mode calculations, carried out in a reiterative fashion, support this assignment.