Chapter 3, Problem 31P

In 1993, the ${\left[{\text{Pt(CO)}}_{\text{4}}\right]}^{\text{2+}}$ ion was reported for the first time [G. Hwang et al. (1993) Inorg Chem., vol.32, p.4667]. One strong absorption at 2235 ${\text{cm}}^{\text{-1}}$ in the IR spectrum was assigned to ${\nu }_{\text{CO}}$, and this was absent in the Raman spectrum, two absorptions ( ${\nu }_{\text{CO}}$) at 2257 ${\text{cm}}^{\text{-1}}$ and 2281 ${\text{cm}}^{\text{-1}}$(absent in the IR spectrum) were observed. Show that these data are consistent with ${\left[{\text{Pt(CO)}}_{\text{4}}\right]}^{\text{2+}}$ having ${\text{D}}_{\text{4h}}$ symmetry.