Electrosorption of ‘hard’ and ‘soft’ aromatic derivatives on mercury

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Abstract
An ‘intrinsic’ value of the adsorption Gibbs energy (ΔG° int)∥, not directly proportional to the measured ΔG∥ ads, has been evaluated for a set of 28 aromatic, heterocyclic and naphthalenic derivatives. The structural feature of (ΔG° int)∥ is rationalised in terms of a ‘soft’ interaction with mercury at the point of zero charge, on the basis of the parr and Pearson concept, accounting on a quantitative basis for the different adsorbability of the compounds. Moreover, the partial charge-transfer coefficient, λ, has been related in a satisfactory way to ΔN(the fractional number of electrons transferred) calculated taking into account the absolute electronegativitiy, χ, and the hardness, η, both of the adsorbate and of mercury.

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