“{trans-1,4-Bis[(4-pyridyl)ethenyl]benzene}(2,2′-bipyridine)ruthenium(II) Complexes and Their Supramolecular Assemblies with -Cyclodextrin,” Sergio H. Toma, et al., Inorg. Chem., 43 (11), 3521-3527, 2004 :

Yeah !

[via Improbable]