Five-coordinate platinum complexes hydrogen bonds

A variety of compounds with metal metal bonds have been prepared. Mercurous compounds which contain the [Hg-Hg] " unit have long been known. More recent examples include compounds in which carbon monoxide is a ligand such as (Co)sMn Re(CO)s and (C6H5)3PAu-Co(CO)4. A number of complexes with transition metal tin bonds have been prepared. One of these, [Pt(SnCl3)5], contains five-coordinated platinum(ll) and is an excellent hydrogenation catalyst. 

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