An alternative to classical? In square-planar d8 complexes the metal ion can interact with axial H2O molecules either as a Lewis acid or as a Lewis base. Ab initio calculations predicted that uncharged PtII complexes form a hydrogen-bond-like interaction with H2O, in which PtII acts as a Lewis base. Such a nonclassical OH⋅⋅⋅Pt hydrogen bond has now been identified in crystals of trans-[PtCl2(NH3)(N-glycine)]⋅H2O by neutron diffraction.
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