Thermodynamics of solution of gaseous tetramethyltin in 36 solvents. Comparison of experimental results with cavity-theory calculations
The standard free energy of solution of Me4Sn(g) in 36 pure solvents has been determined by gas-chromatographic head-space analysis. Calorimetrically determined enthalpies of solution of liquid Me4Sn have been combined with the known enthalpy of vaporisation of Me4Sn to yield values of the enthalpy, and thence the entropy, of solution of Me4Sn(g) in 28 pure non-aqueous solvents. It is shown that values of ΔS°s do not vary greatly with the non-aqueous solvent. Attempts have been made to calculate values of ΔG°s, ΔH°s and ΔS°s for Me4Sn(g) in a number of solvents by use of SPT or SRMR calculations of cavity terms and Lennard-Jones or Kirkwood–Muller calculations of interaction terms. Similar calculations have been carried out for a range of non-polar, gaseous solutes in a few selected solvents.