H. Kunkely et A. Vogler, Ligand-to-ligand charge transfer in (2,2 '-biquinoline)bis(cyclopentadienyl)zirconium(IV) - Absorption and emission in the visible range, EUR J INORG, (12), 1998, pp. 1863-1865
The lowest energy electronic transition of [(cyclopentadienyl)-Zr-2(IV)(2,2
'-biquinoline)](2+), which appears in absorption at lambda(max) = 360 nm an
d in emission at lambda(max) = 518 nm, is of the Cp---> big ligand-to-ligan
d charge-transfer-type.