In this paper, we describe the synthesis, characterisation, and bonding analysis of heterometallic complexes involving the coordination of {Mg-H} and {Zn-H} bonds to group 10 transition metals. Tris(ligated) complexes of this series are structurally related to the tris(alkene) complexes described above and demonstrate an alternating array of six atoms interacting with a central transition metal. Variation of the metalloligand (Zn vs Mg) results in subtle, but key, differences to the structure and bonding, describing different points along the continuum between trigonal planar and hexagonal planar geometries. 2a is a rare example of structurally characterised complex involving coordination of a single Mg-H unit to the transition metal. 2a was characterised by standard techniques as well as neutron diffraction. The structure of 2a contains a planar array of Pd, Mg, H and P atoms. The Pd-P bond lengths are asymmetric with that trans to the hydride being ~0.1