Abstract

The standard molar energy of combustion of pentacyclo[5.4.0.02,6.03,10.05,9]undecane-8,11-dione has been determined by using a static bomb calorimeter. The vapour pressure of the compound was measured in the intervalT=325.64 K toT=340.97 K by the Knudsen-effusion technique. Enthalpy of fusion and enthalpy of transition measurements were carried out by differential scanning calorimetry (d.s.c.). From the experimental results of this work, the standard enthalpies of combustion, sublimation, and formation in the crystalline and gaseous state at the temperature 298.15 K have been derived for pentacyclo[5.4.0.02,6.03,10.05,9] undecane-8,11-dione: ΔfHmo(cr) =−(206.2± 3.2) kJ · mol−1, ΔsubHmo= (92.6± 1) kJ· mol−1, ΔfHmo(g) =−(113.6± 3.4) kJ− mol−1. Strain energy due to the presence of the two carbonyl groups in the molecule is estimated by three different methods with consistent results.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.