Thermodynamics of thallium alkanoates, VI. Thallium(I) n-heptanoate revisited

Article abstract of DOI:10.1016/0021-9614(89)90138-9

The heat capacity of thallium(I) n-heptanoate has been remeasured on a new sample on which the preparative procedures were modified to eliminate the 1-1 (salt + acid) complex (soap) in a previously studied sample.The sub-ambient heat capacity of a new highly pure thallium(I) n-heptanoate is characterized by one set of transitions between 262 and 272 K and another transition at 301 K.The lowest transition temperature at 262.1 K has a maximum of C_p,m ca. 559 R.Next, a bifurcated pair (at 268.6 and 271.4 K) have C_p,ms ca. 300 R, and the highest transition (at 301.0 K) has a maximum C_p,m ca. 1697 R.The corresponding values of Δ_trsS⁰_m for the two sets are about 2.24 R and 1.10 R.At 298.15 K the values of Δ^T₀S⁰_m, Δ^T₀H⁰_m, and Φ⁰_m(T) are 39.79 R, 5979 R * K, and 19.74 R.Smoothed thermodynamic functions at selected temperatures are tabulated through melting.