This question comes from a problem sheet I recently had.

It concerns the fact that Pt-O bond lengths are typically longer than Ti-O ones, even though the radii of the two metals are similar.

My rationale is that as Ti d-orbitals are more contracted than the ones of Pt, it would form shorter bonds for that reason. I was wondering whether there is something else to it.

  • 2
    $\begingroup$ hint: TiO2 has Ti-O about 2A, but TiO has Ti-O about 3A . On the other hand, both PtO2 and PtO have close Pt-O about 2A $\endgroup$
    – permeakra
    Apr 2, 2021 at 18:08
  • $\begingroup$ @permeakra is this to suggest that due to the absence of d-electrons in TiO2, such a compound would be with significantly more ionic character, thus having the atoms closer for electrostatic reasons? $\endgroup$
    – 7daiss
    Apr 3, 2021 at 12:08


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