## 3 Results and Discussion
### Vapour Pressures and Vaporisation/Sublimation Enthalpies of Alkylbenzenes
\begin{table}
\begin{tabular}{l l l l l l} \hline
**Compound** & **M \({}^{\text{a}}\)** & **T-Range** & \(\Delta_{\text{I}}^{\text{S}}H_{\text{m}}^{\text{O}}(T_{\text{sd}})\) & \(\Delta_{\text{I}}^{\text{S}}H_{\text{m}}^{\text{O}}(298.15\text{ K})\) \({}^{\text{b}}\) & **Ref.** \\ \hline CAS & & K & kJ\(\cdot\)mol\({}^{-1}\) & kJ\(\cdot\)mol\({}^{-1}\) & \\ \hline iso-propylbenzene & & & & \(45.2\pm 0.2\) & [20] \\ \hline
2-methyl-iso-propylbenzene & E & 354.3–452.9 & \(43.7\pm 1.0\) & \(49.0\pm 1.5\) & [21] \\
527-84-4 & n/a & & & \(50.6\pm 1.0\) & [22] \\  & \(H_{\text{sd}}\) & & & \(48.2\pm 1.0\) & Table 6 \\  & & & & \(49.3\pm 0.6\) \({}^{\text{c}}\) & \\ \hline
3-methyl-iso-propylbenzene & E & 351.9–449.5 & \(43.7\pm 1.0\) & \(48.9\pm 1.4\) & [21] \\
535-77-3 & n/a & & & \(50.0\pm 1.0\) & [22] \\  & \(H_{\text{sd}}\) & & & \(49.2\pm 1.0\) & Table 6 \\  & & & & \(49.4\pm 0.6\) \({}^{\text{c}}\) & \\ \hline
4-methyl-iso-propylbenzene & E & 401.4–451.5 & \(42.8\pm 1.0\) & \(49.2\pm 1.6\) & [21] \\
99-87-6 & n/a & & & \(50.3\pm 1.0\) & [22] \\  & \(H_{\text{sd}}\) & & & \(48.9\pm 1.0\) & [23] \\  & \(CGC\) & & & \(49.2\pm 1.0\) & [24] \\  & \(H_{\text{sd}}\) & & & \(50.0\pm 1.0\) & Table 6 \\ \hline
1,2-di-iso-propylbenzene & E & 388.6–476.9 & \(47.4\pm 1.0\) & \(54.8\pm 1.8\) & [25] \\
577-55-9 & BP & 350.2–477.2 & \(48.3\pm 1.3\) & \(54.6\pm 1.8\) & Table S4 \\  & \(I_{x}\) & & & \(55.8\pm 1.0\) & Table 5 \\  & \(H_{\text{sd}}\) & & & \(54.8\pm 1.0\) & Table 6 \\  & & & & \(54.9\pm 0.7\) \({}^{\text{c}}\) & \\ \hline
1,3-di-iso-propylbenzene & E & 388.1–476.3 & \(47.4\pm 1.0\) & \(54.7\pm 1.8\) & [25] \\
99-62-7 & T & 283.5–318.5 & \(56.1\pm 1.5\) & \(56.2\pm 1.6\) & [9] \\  & \(I_{x}\) & & & \(55.4\pm 1.0\) & Table S4 \\  & \(I_{x}\) & & & \(54.3\pm 1.0\) & Table 5 \\  & \(H_{\text{sd}}\) & & & \(55.8\pm 1.0\) & Table 6 \\ \hline
1,4-di-iso-propylbenzene & E & 393.4–483.5 & \(47.7\pm 1.0\) & \(55.2\pm 1.8\) & [25] \\
100-18-5 & E & 328.7–483.7 & \(50.7\pm 1.0\) & \(56.3\pm 1.5\) & [26] \\  & E & 393.4–484.7 & \(47.4\pm 1.0\) & \(55.3\pm 1.9\) & [21] \\  & T & 283.7–318.3 & \(56.4\pm 0.6\) & \(56.5\pm 0.7\) & [9] \\  & E & 365.5–529.9 & \(47.7\pm 0.1\) & \(55.7\pm 1.6\) & [27] \\  & TFM & 328.7–675.9 & \(48.0\pm 1.0\) & \(57.2\pm 2.1\) & [28] \\  & & & & \(56.2\pm 0.5\) \({}^{\text{c}}\) & \\ \hline
1,2,4-tri-iso-propylbenzene & BP & 386–517 & \(51.7\pm 1.1\) & \(64.2\pm 2.7\) & Table S4 \\
648-32-3 & \(H_{\text{sd}}\) & & & \(64.7\pm 1.0\) & Table 6 \\  & & & & \(64.6\pm 1.1\) \({}^{\text{c}}\) & \\ \hline
1,2,3-tri-iso-propylbenzene & \(H_{\text{sd}}\) & & & \(63.4\pm 1.0\) & Table 6 \\
2083-67-2 & & & & \(62.7\pm 0.6\) & \(66.8\pm 1.0\) & [29] \\
717-74-8 & T & 283.6–323.3 & \(64.3\pm 1.2\) & \(64.6\pm 1.3\) & [9] \\  & \(I_{x}\) & & & \(64.1\pm 1.0\) & Table 5 \\  & \(H_{\text{sd}}\) & & & \(65.5\pm 1.0\) & Table 6 \\ \hline
1,2,4,5-tetra-iso-propylbenzene & E & 409.9–574.7 & \(56.0\pm 0.1\) & \(69.7\pm 2.7\) & [27] \\
635-11-0 & \(I_{x}\) & & & \(67.5\pm 1.0\) & Table S5 \\ \hline \end{tabular}  
\({}^{\text{a}}\) Methods: T = transpiration method; E = ebulloimetry; n/a = not available; \(I_{x}\) = from correlation of experimental vaporisation enthalpies with Kovats indices (see text); BP = from boiling points at different temperatures available from the literature [30]; CGC = correlation gas-chromatography; \(H_{\text{sd}}\) = derived from results from solution calorimetry. TFM = time flow method [28]; \({}^{\text{b}}\) Vapour pressures available in the literature were treated using Equations (3)–(5) with the help of heat capacity differences from Table S1 to evaluate the enthalpy of vaporisation at 298.15 K. Uncertainties in the vaporisation enthalpies \(I(\Delta_{\text{I}}^{\text{S}}H_{\text{m}}^{\text{O}})\) are the expanded uncertainty (0.95 level of confidence). They include uncertainties from the fitting equation and uncertainties from temperature adjustment to \(T\) = 298.15 K. Uncertainties in the temperature adjustment of vaporisation enthalpies to the reference temperature \(T\)= 298.15 K are estimated to account for 20% to the total adjustment; \({}^{\text{c}}\) Weighted mean value (uncertainties were taken as the weighting factor). Values in bold are recommended for further thermochemical calculations.  
\end{table}