Knowledge Bank

A previous study on the normal species, $HBF2,1$ indirectly estimated the position of the unseen inplane bending fundamental, $\nu 6$ via a small Coriolis perturbation. In an attempt to observe this fundamental directly, the deuterated analogue. $DBF2$ was prepared in situ and its infrared absorption spectrum was recorded between 700 and $920cm-1$ using a high resolution Bomem DA3.002 FT-IR instrument. The strongest band in this region is the out-of-plane bending fundamental, $v4$. This type-C band is heavily perturbed by a second, as yet, unidentified vibrational state. The results of the assignment and analysis of the $v4$ band of DBF2 will be discussed, including the evaluation of a new set of ground state rotational constants for both $D11BF2$ and $D10BF2$. The nature of the perturbing vibration will also be discussed.