Why can't there be a metal-metal multiple bond in .... ? [Re2OCl10] 4- Each Re has an octahedral geometry basically, with 5 Cl- attached to it. It also has a bridging O, which bridges the two Re together. O also produces pi donation to each Re, so that there is basically a double bond between Re-O But still... which can't there be a bond between the Re? there are unpaired electrons which can be paired by making this bond!!!! Can there be metal-ligand and metal-metal multiple bonding in the same molecule? thank you!