Insights into Pt(II)-Hydroxamate Bonding Through the Crystal Structures of DMSO Complexes

Abstract

The complexes [Pt(bha-H)(DMSO)2] and [Pt(sha-H)(DMSO)2], where bhaH is benzohydroxamic acid and shaH is salicylhydroxamic acid, were prepared and the crystal structures determined (both monoclinic, space group Pca21). These complexes provide support for the argument that hydroxamates will only bind to Pt(II) when ligands with soft-donor atoms lie trans to the hydroxamate in the doubly deprotonated hydroximate form. Comparison of the Pt–O bond lengths between these and related structures reveals significant ionic contributions to the bonding.