Abstract
We show in this contribution that new hybrid materials which are active for second harmonic generation (SHG) can be obtained easily from dipolar organoiron(II) NLO-phores like (η2-dppe)(η5-C5Me5)Fe(C≡C-4-C6H4X) (1; X = NO2 and 2; X = C(O)H; dppe = 1,2-(diphenylphosphino)ethane). These new materials are formed upon UV irradiation of dispersions of 1 or 2 in oligoether-acrylates (OEAs) in the presence of an electrostatic dc field. Monitoring the evolution of the second-order susceptibility of these mixtures during the photosolidification process reveals the appearance of a growing noncentrosymmetric arrangement of the organometallic chromophores. Using an optimized experimental protocol, we find solid samples can be isolated which present sizable second-order optical susceptibilities; an SHG value around 3 pm/V is obtained with the samples containing the nitro-functionalized complex 1, while less intense SHG responses were obtained with dispersions of 2. These results are briefly discussed in the light of D...
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