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Mono-and bisnitrile platinum complexes,[PtC^ CNCR)]" and cis-and trans-[PtC^ NCR^](R= Bu ‘, Me and Ph), hydrolyze to amidate amide and mixed amide-nitrile complexes. The amide ligands generally adopt the enol tautomeric form and coordinate to platinum through nitrogen. The presence of two amides cis to one another plays a critical role in favoring the association of platinum units in dimers. For example, molecules of cis-[PtCl2 {HN= C-(OH) Bu'} 2] 2, 7b, comprise twomonomeric units, placed face to face, with a Pt-Pt distance of 3.165 (1) A and four interplanar NH—Cl hydrogen bonds. Although hydrogen bonding interactions would place the dimer in the eclipsed conformation, the compound adopts the staggered conformation which minimizes interligand steric interactions allowing a closer approach of the two platinum subunits. The driving forceto shortening the intermetallic distance stems from a direct …