3RD-HARMONIC GENERATION MEASUREMENTS FOR HALOGEN-DOPED ONE-DIMENSIONAL NICKEL-COMPLEXES

Halogen doping effects on the third-order nonlinear optical properties of bis(dimethylglyoximato)nickel(II), Ni(dmg)(2), which has a one-dim ensional backbone of metal chains, were examined, Ni(dmg)(2) showed 10 (-12) esu order of the third-order nonlinear susceptibility chi((3)) b y three-photon resonance at the d(z)(2)-p: transition band. Exposing t he Ni(dmg)(2) film to chlorine or bromine gas induced a red shift of t he d(x)(2)-p: transition band and considerable enhancement. of the opt ical nonlinearity. In particular, chlorine doping led to two-odd order s of enhancement of the chi((3)) values (10(-10) esu order). The dopin g effects are discussed in relation to the electron delocalization in the linear metal chains.