  An explorative quantum chemical study of the triatomic molecule IYPt, its
isomers, group 17 congeners, and dimer is carried out. The results indicate
that IYPt is a ground-state singlet with a bent geometry and a large electric
dipole moment of magnitude 4.8 D. The IPtY isomer also is bent but 33.5
kcal/mol higher in energy whereas the isomer with the central iodine atom is
not stable a molecule. Furthermore, the calculations indicate that only the
dimer of IYPt, made of a (PtY)2 rhombus with the iodine atoms bonded to Y, is
characterized by positive vibrational frequencies.
