The Thermodynamic Functions of Ferrocene Derivatives

N. V. Karyakin, M. S. Kozlova, M. S. Sheiman, G. P. Kamelova, and V. N. Larina

Research Institute of Chemistry, Nizhni Novgorod State University, pr. Gagarina 23/5, Nizhni Novgorod, 603600 Russia

E-mail: karyakin@ichem.unn.runnet.ru

Received September 17, 2002

Abstract—The temperature dependences of the heat capacities of ethylferrocene (7–301 K), n-butylferrocene
and (N,N-dimethylaminomethyl)ferrocene (6–300 K), ferrocenylacetic acid (5–302 K), and formylferrocene
(60–301 K) were studied in an adiabatic vacuum calorimeter. The thermodynamic parameters of phase and
physical transitions were determined and the thermodynamic functions of the compounds were calculated in
the temperature range 0–300 K. The enthalpies of combustion of liquid ethylferrocene, n-butylferrocene, and
(N,N-dimethylaminomethyl)ferrocene and crystalline ferrocenylacetic acid and formylferrocene at 298.15 K
were measured in a stationary-bomb isothermic-shell calorimeter. The standard thermodynamic functions of
their formation in the condensed state at 298.15 K were calculated. The temperature dependences of vapor pres-
sures over ethylferrocene, n-butylferrocene, (N,N-dimethylaminomethyl)ferrocene, and formylferrocene were
studied by the Knudsen effusion method, and the enthalpies of their vaporization and sublimation were deter-
mined. The experimental data were used to calculate the absolute entropies and the standard thermodynamic
functions of formation of ethylferrocene, n-butylferrocene, (N,N-dimethylaminomethyl)ferrocene, and formyl-
ferrocene in the ideal gas state at 298.15 K.

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