Abstract
The combined use of combustion and solution calorimetry was proposed as a method for determining the standard enthalpy of formation of the complex salts of transition metals, viz., cobalt(II), nickel(II), and zinc, with the organic ligand (5-aminotetrazol-1-yl)acethydrazide. The enthalpies of solution in water and in a 0.1 M solution of hydrochloric acid were measured for the complex salts and ligand. The enthalpy of combustion of the ligand was determined by the combustion calorimetry method, and its standard enthalpy of formation was calculated. The thermochemical cycle was developed for determining the standard enthalpy of formation of the complex salts. The reliable values of the enthalpies of formation of the salts in the standard states were obtained, and the enthalpies of formation of the earlier unknown complex ions were determined.
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Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 5, pp. 878–882, May, 2009.
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Kon’kova, T.S., Matyushin, Y.N., Miroshnichenko, E.A. et al. Thermochemistry of complex salts of transition metal perchlorates with tetrazole ligands. Russ Chem Bull 58, 896–901 (2009). https://doi.org/10.1007/s11172-009-0112-5
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DOI: https://doi.org/10.1007/s11172-009-0112-5