Bimetallic Push-Pull Complexes

Jayaprakash et al. [198] reported the series of push-pull bimetallic polyene complexes [(CO)5M=C(OCH3)(-CH=CH-) (t C5H4)Fe(r C5H5)] (M = W, Cr n = 1-4) with ferrocene as donor and a carbene complex of Cr or W as acceptor. The jSi o6(HRS) values increase with increasing the conjugation of the n linker for the same n linker, the chromophore based on W exhibits higher second-order NLO responses than that based on Cr, as expected for a more efficient n backdonation from the W atom. The quadratic hyperpolarizability of these bimetallic push-pull... 

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