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The molecular structure of the chloro-bridged tetraosmium cluster, dodecacarbonyl-1κ3C,2κ3C,3κ3C,4κ3C-μ-chloro-3:4κ2Cl-tris-μ-hydrido-1:2κ2H;1:3κ2H;2:4κ2H-tetraosmium(5Os—Os), [Os4(μ-Cl)(μ-H)3(CO)12], consists of a `butterfly' arrangement of Os atoms, just as in the iodo analogue. The chloro bridge in the tetraosmium cluster is symmetric, whereas in the pentaosmium cluster, tetradecacarbonyl-1κ3C, 2κ2C,3κ3C,4κ3C,5κ3μ-chloro-2:5κ2Cl-tris-μ-hydrido-1:2κ2H;2:3κ2H;2:4κ2H-pentaosmium(8 Os—Os), [Os5(μ-Cl)(μ-H)3(CO)14], it is distinctly asymmetric. This asymmetry is attributed to the trans influence of a carbonyl ligand, which lengthens the trans-Os—Cl bond.

Supporting information

cif

Crystallographic Information File (CIF)
Contains datablocks global, I, II

sft

Structure factor file (SHELXL table format)
Supplementary material

sft

Structure factor file (SHELXL table format)
Supplementary material

CCDC references: 128370; 128371

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