3RD-ORDER NONLINEAR-OPTICAL PROPERTIES OF EVAPORATED THIN-FILMS OF PLATINUM-ALKYLDIONEDIOXIME COMPLEXES - EFFECTS OF METAL-METAL DISTANCE

Effects of the metal-metal distance on the third-order nonlinear optic al property of one-dimensional platinum complexes were investigated. G lyoximes with several alkyl substituents were synthesized as a ligand for one-dimensional platinum complexes. All prepared platinum complexe s had linear platinum chains in the solid state and had different plat inum-platinum distance depending on the steric hindrance of alkyl subs tituents. They showed the 5d(z2)6p(z) transition band in the visible r egion, of which peak wavelengths were well related to the platinum-pla tinum distance. Frequency dispersion of the third-order nonlinear susc eptibilities chi((3)) for evaporated thin films of platinum-alkyldione dioxime complexes was estimated by the third-harmonic generation measu rements. It was revealed that the shorter metal-metal distance gave th e larger chi((3)).