Abstract
The crystalline and gas phase enthalpy of formation of 5-cyano-7H-dibenzo-[a,c]-cyclohepten-6-amine (1) (142.0 ± 11.6 and 264 ± 20 kJ mol−1, respectively) are reported. The sublimation enthalpy at T = 298.15 K for this compound was evaluated by combining the fusion enthalpy from DSC measurements adjusted to 298 K with estimated vaporization enthalpy. The experimental enthalpy of formation is discussed in relationship with values calculated at the G3(MP2)//B3LYP level of quantum chemical theory and by means of group additivity. The crystal structure of this compound was determined by X-ray crystallography and shown to exist entirely in the cyanoenamine form 1, i.e. not the tautomeric α-cyanoimine 2.
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R. N. and J. F. L. gratefully acknowledge the support of the Spanish Ministerio de Economía y Competitividad under Project CTQ2010-16402.
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This paper is dedicated to our coworker and friend Maria Victoria Roux.
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Perisanu, S., Contineanu, I., Neacsu, A. et al. Thermochemical and structural study of a dibenzocycloheptane cyanoenamine. Struct Chem 24, 1975–1980 (2013). https://doi.org/10.1007/s11224-013-0286-1
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DOI: https://doi.org/10.1007/s11224-013-0286-1