Abstract
Heats and entropies of
complex formation of the thiophen-2-carboxylate ion with Ni2+, Cu2+,
Zn2+ and Cd2+ have been determined by direct calorimetry, the formation constants being known from the
literature. The measurements were carried out in aqueous medium at 25�C and an
ionic strength of 1. The values of the thermodynamic quantities for
thiophen-2-carboxylate, compared with those for (ethylthio)acetate
and (phenylthio)acetate obtained previously, indicate a greater tendency for
aromatic sulfur to form bonds with the above metals than for aliphatic sulfur.
The causes of this behaviour are discussed.
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