The crystal structure of the Δ,Δ enantiomer of the binuclear “light‐switch” ruthenium complex μ‐(11,11′‐bidppz)(1,10‐phenanthroline)4 Ru24+ bound to the oligonucleotide d(CGTACG) shows that one dppz moiety of the dumbbell‐like compound inserts into the DNA stack through the extrusion of an AT base pair. The second dppz moiety recruits a neighboring DNA molecule, and the complex thus cross‐links two adjacent duplexes by bridging their major grooves. Pinned together by molecular rivets: The crystal structure of the complex between double‐stranded DNA and the binuclear complex μ‐(11,11′‐bidppz)(1,10‐phenanthroline)4 Ru24+ (1, shown in blue; bidppz=bis(dipyridophenazine)), showed that one half of the bidppz ligand inserts into a DNA duplex, and the other half stacks onto the blunt end of a nearby DNA duplex. Two molecules of 1 with the same binding mode effectively cross‐link two DNA duplexes.