A thermochemical study of the reactions of 8-hydroxyquinoline with Co(Ac)2·4H2O and Zn(Ac)2·2H2O

The solid-state coordination reactions:2HQ(s)+Co(Ac)2·4H2O(s)→Co(HQ)2·2H2O(s)+2HAc(l)+2H2O(l)2HQ(s)+Zn(Ac)2·2H2O(s)→Zn(HQ)2·H2O(s)+2HAc(l)+H2O(l)have been studied by solution calorimetry. The molar dissolution enthalpies of the reactants and the products in a certain solvent, 4 mol l−1 HCl, of this solid–solid coordination reaction have been measured using an isoperibol calorimeter. From the results and other auxiliary quantities, the standard molar formation enthalpies of [Co(HQ)2·2H2O(s), 298.15 K], [Zn(HQ)2·H2O(s), 298.15 K] and have been determined to be ΔfHmΘ (Co(HQ)2·2H2O(s), 298.15 K)=−766.9±3.0 kJ mol−1, ΔfHmΘ (Zn(HQ)2·H2O(s), 298.15 K)=−580.7±3.0 kJ mol−1.