Third-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 optical property of one-dimensional platinum complexes were investigated. Glyoximes with several alkyl substituents were synthesized as a ligand for one-dimensional platinum complexes. All prepared platinum complexes had linear platinum chains in the solid state and had different platinum—platinum distance depending on the steric hindrance of alkyl substituents. They showed the 5dZ2—6pZ transition band in the visible region, of which peak wavelengths were well related to the platinum—platinum distance. Frequency dispersion of the third-order nonlinear susceptibilities ¢(3) for evaporated thin films of platinum—alkyldione-dioxime complexes was estimated by the third-harmonic generation measurements. It was revealed that the shorter metal—metal distance gave the larger ¢(3).