New
type isomers that differ in metal–metal bond type are isolated.
One is the Pt–Hg–Pt complex, which has two metal–metal
covalent bonds, Pt–Hg = 2.5459(8) and 2.5483(7) Å, and
the other is the Pt→Hg–Pt complex, which has one metal–metal
covalent bond, Pt–Hg = 2.5744(6) Å, and one metal–metal
dative bond, Pt→Hg = 2.6635(7) Å.
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