Bj. Coe et al., RUTHENIUM(II) AMMINE CENTERS AS EFFICIENT ELECTRON-DONOR GROUPS FOR QUADRATIC NONLINEAR OPTICS, Chemical communications, (17), 1997, pp. 1645-1646
Ruthenium(II) complex salts trans-[Ru(NH3)(4)(L-D)- (L-A)][PF6](3) (L-
D = an N-donor ligand, L-A = a 4,4'-bipyridinium ligand) exhibit large
, tunable static first hyperpolarizabilities beta(o) which are associa
ted with intense, visible metal-to-ligand charge-transfer excitations.