The enthalpy of formation of diamantane

Thermodynamic properties of pentacyclo[5.4.0.02,6.03,10.05,9]undecane, C11H14

“…Experimental and calculated energy values are given in . The agreement of the calculated and third-law ''experimental'' values of the standard molar entropy of pentacyclo[5.4.0.0 2,6 .0 3,10 .0 5,9 ]-undecane, C 11 H 14 , in the ideal-gas state may be considered as good because their difference does not exceed the sum of the uncertainties in their determination.…”

“…Results of a thermodynamic study of B = heptacyclo[6.6.0 2,6 .0 3,13 .0 4,11 .0 5,9 .0 10,14 ]-tetradecane were reported in a previous article.…”

“…The sample of pentacyclo[5.4.0.0 2,6 .0 3,10 .0 5,9 ]undecane was synthesized by the method described by Marchand and Allen. (2) It was purified by double vacuum sublimation at T=353 K and p=200 Pa; this afforded material of mass fraction 0.989 as determined by g.c.…”

“…Molecules of pentacyclo[5.4.0.0 2,6 .0 3,10 .0 5,9 ]undecane (A, figure 1) have a substantially lower symmetry (C s group) than those of B (D 2d group). This is expected to result in significant changes in thermal behavior of its crystals vis-a`-vis those of B.…”

“…Thermodynamic properties of pentacyclo [5.4.0.0 2,6 .0 3,10 .0 5,9 ]undecane have been determined. The heat capacity was measured by vacuum adiabatic calorimetry (T=5.0 K to T=320.6 K) and by the triple heat-bridge method (T=300 K to T=480 K).…”