Grafting and polymer formation on silicon from unsaturated Grignards: I-aromatic precursors.
Anodic decomposition of a phenylmagnesium halide at a surface-hydrogenated silicon electrode leads to formation of polymeric layers covalently anchored to the silicon surface. These layers have been characterized using spectroellipsometry, photoluminescence, infrared, and X-ray photoelectron spectroscopies. The phenyl ring appears preserved in the process, and the polymer formed is a polyphenylene. Contamination by aliphatic groups from the solvent may be minimized by using a solvent resistant to hydrogen abstraction by the phenyl radicals. Regioselectivity of the branching may be oriented to the para form by using 4-chlorophenylmagnesium bromide as the precursor.
Laboratoire PMC, CNRS-Ecole Polytechnique, Route de Saclay, 91128 Palaiseau, France, Institut Lavoisier, Université de Versailles St-Quentin-en-Yvelines, 45 av. des Etats-Unis, 78000 Versailles, France.
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S
Fellah
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F
Ozanam
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JN
Chazalviel
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J
Vigneron
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A
Etcheberry
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M
Stchakovsky