Thermochemistry of the dissolution of tetra-4-sulfophthalocyanine nickel in aqueous solutions KОН at 298.15 K
Abstract
We have obtained a nickel tetra-4-sulfophthalocyanine complex, soluble in water. The standard enthalpies of formation of a compound can be considered as the sum of the additive group contributions of fragments of these molecules. We assessed this value using a method based on group systematics with a Benson-type classification of fragments taking into account the influence of the primary environment of the atoms. In order to obtain the value of the contribution of Ecompl(N)4-Ni, we used the bomb calorimetry method. The enthalpy of combustion of tetrakis (4-methoxyphenyl) porphine and its complex with nickel tetrakis (4-methoxyphenyl) porphine nickel were experimentally determined. Thermal effects of dissolution of crystalline nickel tetra-4-sulfophthalocyanine in aqueous solutions of various KOH concentrations (from 0.002 to 0.02 mol∙L−1) at 298.15 K were determined by direct calorimetric method. The measurements were carried out in a calorimeter with an isothermal shell equipped with a reaction vessel with a volume of 60 cm3, electric calibration at T = (293.15–308.15) ± 0.01 K and P = 100.5 ± 0.7 kPa and automatic temperature registration. The standard enthalpy of formation of dissociation products of the tetra-4-sulfophthalocyanine complex with nickel in an aqueous solution has been calculated.
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