Dimolybdenum Quintuple Bonds
In 2009 a dimolybdenum compound with a quintuple bond and two diamido bridging ligands was reported with a Mo-Mo bond length of 202 pm. The compound was synthesised starting from potassium octachlorodimolybdate (which already contains a Mo2 quadruple bond) and a lithium amidinate, followed by reduction with potassium graphite:
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