Bis-silyl Substituted Ferrocenylenes, Including Dicyanovinyl Electron-withdrawing Groups, as Potential Non-linear Optical Materials
1,1′-Bis-silylferrocenylenes (p-XC6H4 SiMe2-C5H4)2Fe, X=Br (1), CHO (2), CH=C(CN)2 (3) have been synthesized and characterized by NMR and Mössbauer spectroscopy, single crystal X-ray diffraction and electrochemistry. Complex 1 crystallizes in the centrosymmetric space group P21/n whereas 3 forms in the non-centrosymmetric group Cc. The latter complex exhibits a chain-like structure in the solid state via C-H⋯N intermolecular hydrogen bonding. The hyperpolarizability of 3 is significantly greater than the related mono-silylferrocene complex (C5H5) Fe(C5H4SiMe2C6H4 CH=C(CN)2) while Mössbauer spectroscopy exhibits negligible charge transfer between the cyano groups and the ferrocenylene iron center. © 2003 Published by Elsevier B.V.
X. Zhao et al., "Bis-silyl Substituted Ferrocenylenes, Including Dicyanovinyl Electron-withdrawing Groups, as Potential Non-linear Optical Materials," Journal of Organometallic Chemistry, Elsevier, Jan 2003.
The definitive version is available at http://dx.doi.org/10.1016/j.jorganchem.2003.07.006
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