Thermochemistry of dissolution of tetra-4-carboxyphthalocyanine hydroxoaluminum in aqueous KOH solutions at 298.15 K

Hydroxoaluminum tetra-4-carboxyphthalocyanine is studied. Heat effects of dissolution of crystalline phthalocyanine in aqueous solutions of different concentration of KOH at 298.15K are determined by the direct calorimetric method. The values of the heat effects of the stepwise dissociation of AlOHРс(4-COOH)4 are calculated using the HEAT computer program. The enthalpies of combustion of the compound involved are found using IKA C6000 isoperibolic calorimeter (the bomb calorimetry method); they are necessary for calculation of standard enthalpies of formation of AlOHРс(4-COOH)4 and products of its dissociation in an aqueous solution.