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 pendan t ferrocene and an end-capping pyridine have been evaluated by the HRS meth od. The NLO responses (beta) are clearly dependent on both the nature of th e electron-accepting fragment and the length of the conjugated chain. As se en in some previous works on other organometallic complexes, the spectrosco pic properties and electrochemical behavior of our compounds provide effici ent diagnostics for the nonlinear optical behavior.