Dinucleating Naphthyridine‐Based Ligand for Assembly of Bridged Dicopper(I) Centers: Three‐Center Two‐Electron Bonding Involving an Acetonitrile Donor

Unusual bonding: A ligand system that promotes formation of a rare μ-η1:η1 acetonitrile-bridged dicopper(I) complex (see picture) has been developed. The acetonitrile ligand is involved in a three-center two-electron bond supported by a cuprophilic interaction. The labile acetonitrile ligand can be substituted with xylyl isocyanide or CO.