Ar. Dias et al., ORGANOMETALLIC COMPOUNDS FOR NONLINEAR OPTICS - SYNTHESIS, REACTIVITYAND ELECTROCHEMISTRY OF CHIRAL ETA-5-MONOCYCLOPENTADIENYL(NITRILE) IRON COMPLEXES, Journal of organometallic chemistry, 453(2), 1993, pp. 241-247
A new family of compounds of general formula [FeCp ((+)-DIOP)(p-NCC6H4
R')][PF6] (R'= donor or acceptor group) was synthesized and characteri
zed for non-linear optical properties. Spectroscopic (IR and H-1 C-13
and P-31 NMR) and electrochemical (cyclic voltammetry) studies are con
sistent with charge-transfer from Fe(II) to coordinated benzonitrile v
ia d-pi back donation. One compound of this family, [FeCp((+)-DIOP)(p
-NCC6H4NO2)][PF6] has an SHG value 38 times greater than that of urea.