Abstract
The energies of combustion of creatine (anhydrous and monohydrate), creatinine, and arginine were measured in a static bomb adiabatic calorimeter, in pure oxygen at 3,040 kPa. The derived standard enthalpies of formation in solid state of the above-mentioned compounds are, respectively, -520.4 ± 4.3, -809.7 ± 1.3, -204.2 ± 7.0, and -634.8 ± 2.3 kJ mol -1 . The data of enthalpy of formation are compared with literature values and with estimated values by means of group additivity. The dehy- dration of creatine monohydrate and the processes occurring in the three guanidine derivatives at temperatures exceeding 200 C were investigated by means of DSC.
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