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Figure 1
Formation of the dinuclear, trinuclear and tetranuclear rhenium clusters from fac-[Re(CO)3(H2O)3]+. Note Re, as indicated in complexes 3 and 4 represents the [Re(CO)3] fragment. Illustrated without the carbonyl ligands for the sake of clarity.

IUCrJ
Volume 6| Part 4| July 2019| Pages 695-702
ISSN: 2052-2525
https://doi.org/10.1107/S2052252519006651