Standard Enthalpy of Formation of Dibenzo-p-dioxine

V. A. Luk’yanova*, V. P. Kolesov*, N. V. Avramenko*, V. P. Vorob’eva**, and V. F. Golovkov*

* Faculty of Chemistry, Moscow State University, Moscow, 119899 Russia
** Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, Moscow, 117977 Russia

Received October 9, 1995

Abstract—The energy of combustion of crystalline dibenzo-p-dioxine (U = –5714.2 4.1 kJ/mol) was
determined for the first time in a static-bomb water calorimeter. The enthalpy of sublimation (_sH = 89.55
0.72 kJ/mol) was measured in a Calvert microcalorimeter. The data obtained were used to calculate the standard
enthalpy of formation of dibenzo-p-dioxine in the crystalline and gaseous states (–148.7 4.4 and –59.2 4.4 kJ/mol,
respectively).

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