The Vibrational spectra of the selected p-hydroxybenzoates have been record
ed and analyzed. Cations of the investigated complexes were of similar radi
i but of different electronic charges. It has been found that only the stat
istical analysis of correlation existing between the linear combination of
several aromatic ring vibrational modes and the ionic potential of the inve
stigated cations (simple function of the ionic radius, atomic weight and el
ectronic charge) provides accurate information on the operation of these ca
tions on the aromatic system of the ligand. (C) 2001 Elsevier Science B.V.
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