VI. Thallium(I) n-heptanoate revisited a

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 l-l (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,,, u 559R. Next, a bifurcated pair (at 268.6 and 271.4 K) have C&s x 3OOR, and the highest transition (at 301.0 K) has a maximum C,, % 1697R. The corresponding values of A,, & for the two sets are about 2.24R and l.lOR. At 298.15 K the values of AWm, A,$HA, and @k(T) are 39.79R, 5979R. K, and 19.7413. Smoothed thermodynamic functions at selected temperatures are tabulated through melting. 1