Conclusions
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1.
The true heat capacity of tetrammine chloroplatinate is measured for the temperature range 13–300°K. A λ-type anomaly is observed on the curve of heat capacity against temperature in the region 150–175°K.
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2.
The heat contents, entropies and free energies of formation at 298.15°K are calculated for the following compounds: [Pt(NH3)4]Cl2, cis-[Pt(NH3)2Cl2] and trans-[Pt(NH3)2Cl2].
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3.
We calculated the free energies for the reactions of decomposition of the tetramine with the formation of the cis and trans diamine. The difference between the free energies, equal to 3.28 kcal/mole, can be considered as the thermal characteristic of the trans effect.
Literature cited
V.A. Palkin, N.N. Kuz'mina, and I.I. Chernyaev, Zh. Neorgan. Khim.,10, 2220 (1965).
I.I Chernyaev, V.A. Palkin, R.A. Baranova, and N.N. Kuz'mina, Zh. Neorgan. Khim.,5, 1428 (1960).
V.E. Gorbunov and V.A. Palkin, Izv. AN SSSR, Ser. Khim., 159 (1969).
Handbook: Synthesis of Complex Compounds of the Platinum Group Metals [in Russian], Nauka, (1964).
G.A. Sharpataya and V.A. Sokolov, Zh. Neorgan. Khim.,10, 992 (1965).
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 1, pp. 161–163, January, 1969.
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Gorbunov, B.E., Palkin, V.A. Thermodynamic characteristics of tetrammine chloroplatinate. Russ Chem Bull 18, 152–154 (1969). https://doi.org/10.1007/BF00907618
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DOI: https://doi.org/10.1007/BF00907618