Ruthenium(ii) ammine centres as efficient electron donor groups for quadratic non-linear optics

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Abstract
Ruthenium(II) complex salts trans-[Ru(NH 3 ) 4 (L D )- (L A )][PF 6 ] 3 (L D = an N-donor ligand, L A = a 4,4′-bipyridinium ligand) exhibit large, tunable static first hyperpolarizabilities β 0 which are associated with intense, visible metal-to-ligand charge-transfer excitations.