Preprint Article Version 1 This version not peer reviewed

Enthalpy and Free Energy of Formation of Diamido and Monoamido Phosphoric Acid

Version 1 : Received: 2 February 2018 / Approved: 7 February 2018 / Online: 7 February 2018 (05:12:33 CET)

How to cite: Neelameggham, N.R. Enthalpy and Free Energy of Formation of Diamido and Monoamido Phosphoric Acid. Preprints 2018, 2018020055 (doi: 10.20944/preprints201802.0055.v1). Neelameggham, N.R. Enthalpy and Free Energy of Formation of Diamido and Monoamido Phosphoric Acid. Preprints 2018, 2018020055 (doi: 10.20944/preprints201802.0055.v1).

Abstract

Diamidophosphate has been identified as a possible prebiotic compound used in the precursor membranes of the first ‘life’. Compounds such as these will be helpful in developing novel biomimetic approaches in synthetic chemistry. Thermochemical data for this type of compounds are not available. Hess’ law and estimates from calorimetric measurements used by Wakefield in the 1970s for other amido phosphates have been used to estimate the thermochemical values for the diamido and monoamido-phosphoric acid. Enthalpy of formation at 298.15 oC is calculated as – 821.9 kJ/mol and the free energy of formation calculated as -813.5 kJ/mol for the diamidophosphoric acid. The calculated enthalpy of formation of monoamidic phosphoric acid is -1117.1 kJ/mol and its free energy of formation is - -1105 kJ/mol.

Subject Areas

amidophosphoric acid; diamidophosphate; prebiotic phosphoryl compound; phosphonitrogen glass; enthalpy; Gibbs Free energy; biomimetic nitrogen fixation

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