The temperature dependence of the heat capacity of crystalline (1-hydroxyethyl)ferrocene (HEF) has been studied in the temperature interval 5-340 K in a precision vacuum adiabatic calorimeter. The low-temperature (20 K ? T ? 50 K) heat capacity has been analyzed on the basis of the Debye theory of heat capacity of solids and the multifractal model. The type of topology and the relative stiffness of structures of (1-hydroxyethyl) ferrocene, ferrocenemethanol and ethylferrocene have been found. The standard thermodynamic functions [H ° (T) – H ° (0)], S ° (T) and [G ° (T) – H ° (0)] from T ? 0 to 340 K of crystalline HEF and its standard entropy of formation at T = 298.15 K have been calculated. The thermodynamic properties of the compound studied are compared with those of ferrocene, ferrocenemethanol and ethylferrocene.
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