Abstract
Abstract The interaction of 5-(p-sulfophenylazo)-salicylic acid with zinc(II), copper(II), nickel-(II), cobalt(II), manganese(II), magnesium(II), calcium(II) and iron(III) has been investigated in aqueous media at 25.0±0.1°C and the ionic strength of 0.10 m. The stability constants for the 1 : 1 and 2 : 1 (ligand to metal) chelates of nickel, cobalt, manganese and magnesium, and for the 1 : 1 calcium chelate, as well as for the 2 : 1 ferric chelate, have been evaluated, and the resulting stability order with respect to the bivalent metals has been found to follow the sequence: calcium(II)<magnesium(II)<manganese(II)<(zinc(II))<copper(II)<nickel(II)<copper(II). The stability sequence, zinc(II)<nickel (II), is contrary to that observed for the catechol chelates. A p-sulfophenylazo group demonstrated an electron-withdrawing effect, the magnitude of which was slightly greater than that of a sulfonate group. However, the effect of the former group on the chelate-stability has been found to be comparable with that of the latter. The present salicylate derivative is also a good chelating agent for iron (III) ion, even though the chelate system somehow becomes involved in a higher pH range.
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