fac-Tricarbonylchlorobis(pyridine-N)rhenium and fac-Tricarbonylchlorobis(4,4'-bipyridine-N)rhenium

Structural analyses for the title compounds (OC-6-32)-tricarbonylchlorobis(pyridine-N)rhenium(I), [ReCl(C₅H₅N)₂(CO)₃] and (OC-6-32)-tricarbonylchlorobis(4,4'-bipyridine-N)rhenium(I), [ReCl(C₁₀H₈N₂)₂(CO)₃] show that both complexes have the expected fac-octahedral geometry. The pyridine complex has a local C₂ symmetry, with the rotation axis bisecting the N-Re-N' and OC-Re-CO angles. In contrast with closely related tetrameric assemblies which crystallize as porous channel-containing structures, the title compounds form dense crystals which are packed in herring-bone fashion.

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