Large second-order NLO properties of new conjugated oligomers with a pendant ferrocenyl and an end-capped pyridine

The NLO properties of a series of vinylenephenylene complexes with a pendant ferrocene and an end-capping pyridine have been evaluated by the HRS method. The NLO responses (β) are clearly dependent on both the nature of the electron-accepting fragment and the length of the conjugated chain. As seen in some previous works on other organometallic complexes, the spectroscopic properties and electrochemical behavior of our compounds provide efficient diagnostics for the nonlinear optical behavior.