Linert , Wolfgang and De Marco, Domenico (1998) Lew Acidity of Cations in Nonaqueous Solvents. Accademia Peloritana dei Pericolanti, Classe di Scienze FF. MM. NN., 76-77. pp. 37-58.
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The shift of the visible charge-transfer absorption bands of in various solvents that results from interaction of solvent molecules or of cationic species with the free electron pair on the -CN group(s) has been investigated and the results have been used to estabilish Acceptor Numbers for cations, , dissolved in various solvents of low donicity. Nitromethane (NM) has been used as a reference solvent because it is both a very weak donor and a relatively weak acceptor solvent. (The solvent must exhibit donor and acceptor properties in order to ensure solubility of the cationic species and the indicator). Apparent Acceptor Numbers for cations dissolved in various solvents other than nitromethane are also given and used to show that the acceptor properties of cations vary in a way directly related to the Donor Number of the solvent (i.e. a decrease in the effective Acceptor Number of the cations is observed with increasing . This arises from competition between solvent and acceptor ion fot the used as the Lewis-acid indicator). The results are compared with the spectral shift of the analogous complex . The relationship between the proposed AN scale for cations and other practical and theoretical measurements of the Lewis acidity of cations is discussed.
|Subjects:||M.U.S. - Miscellanea > Atti Accademia Peloritana > Classe di Scienze Fisiche, Matematiche e Naturali > 1998-99|
|Depositing User:||Dr A F|
|Date Deposited:||18 Sep 2012 09:58|
|Last Modified:||18 Sep 2012 09:58|
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