Abstract
Synthesis and UV‐spectroscopic Characterization of Carbenium Ions on AerosilThe interaction of aerosil with various triphenylmethyl derivatives in the cationic vinyl polymerization in 1,2‐dichloroethane was studied. The adsorption of the triphenylmethylium ions onto aerosil surfaces strongly depends on both the type of substituents (R CH3, OCH3, Cl, H and NO2) and the nature of the counter anion (SbCl6⊖, FeCl4⊖, SnCl5⊖, HSO4⊖, SO42⊖, F⊖, Cl⊖, Br⊖, CF3COO⊖, N3⊖ and SCN⊖). The binding of the triphenylmethylium ions with aerosil occurs via nucleophilic anions such as halides. Counter anions derived from metal halides as MtXn+1⊖ are not able bind on aerosil. Covalent compounds as triphenylmethyl halides are ionized by the acidic aerosil surface. The influence of substituents at the triphenylmethylium ion, the type of counter anions and the influence of water traces on surface — ionization are discussed.
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