Front Cover: Ligand‐ and Metal‐Based Reactivity of a Neutral Ruthenium Diolefin Diazadiene Complex: The Innocent, the Guilty and the Suspicious (Chem. Eur. J. 21/2018)

Wanted: dead or alive! Non‐innocent ligands not only give rise to interesting electronic structures, but can also trigger unexpected ligand‐centered reactivity. The diazadiene diolefin (trop2dad) molecule is a “pure‐blood” example. Several resonance structures contribute to the electronic structure of [Ru(trop2dad)], which shows both ligand‐ and metal‐centered reactivity. Furthermore, reaction‐profile calculations show that trop2dad ligand radical contributions give rise to lower barriers in reactions involving the dad moiety. Hence, the “suspicious” trop2dad ligand is neither fully “innocent”, nor completely “guilty”. The Front Cover is a wink to the classic western “The Good, The bad and the Ugly”. More information can be found in the Full Paper by B. de Bruin, M. Trincado, H. Grützmacher et al. on page 5513.