Knowledge Bank

The infrared spectra ($4000-20cm-1$) of gaseous and solid $GeH3NNN$ and $GeD3NNN$ and the Raman spectra ($3000-0cm-1$) of liquid and solid $GeH3NNN$ and $GeD3NNN$ have been recorded. The vibrational spectrum has been assigned on the basis of $CS$ symmetry. The GeNN bend was observed in the Raman spectrum of the gas $at5\sim 150$ $cm-1$ however, the frequency of the $GeH3$ torsion could not be determined. A normal coordinate calculation has been carried out by utilizing a modified valence force field. The GeN stretching force constant was found to have a significantly smaller value than the corresponding force constant in $GeH3NCO$ and $GeH3NCS$. A considerable amount of mixing was found between the GeN stretch and the NNN in-plane bend. The frequencies of the normal modes and the normal coordinate analysis of $GeH3NNN$ are discussed in view of the recent results reported for $GeH3NCO$ and $GeH3NCS$.