Thermochemistry of Heteroatomic Compounds: the Heats of Combustion and Formation of Glycoside and Adenosine Phosphates

Vitaly Ovchinnikov, Ludmila Lapteva

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DOI: 10.4236/ijoc.2011.13011                

Abstract

The heats of combustion of 4th glycoside in the condensed state with the use of the equation Δ_combH＝15.7-117.2(N-g) , in which N is a number bond-forming (valence) electrons less the number (g) of lone electron pairs of nitrogen (g = 1) and oxygen (g = 2), have been determined. Such dependence is deduced previously joint for the description of the combustion enthalpies of 17 simple ethers of a cyclic structure and different sugars. The heats of formation ( Δ_fH^o ) of the mentioned above glycosides were calculated according to the Hess law via two ways: 1) through the use their heats of hydrolysis ( Δ_hydrH ), which have been investigated earlier experimentally, 2) with the use the calculated the heats of combustion. The last procedure has been used also for the calculation of the heats of formation of the adenosine tri(ATP)-, di(ADP)- and mono(AMP)phosphates because of such thermochemical parameter is often hard achieved experimentally. The heats of hydrolysis ( Δ_fH^°_hydr ) of ATP into ADP and ADP into AMP were calculated on the basis of their heats of formation in water ( Δ_fH^°_aq ). The free energies of the same process ( Δ_hydrG ) were known in literature. Last circumstance give us a possibility to calculate the hydrolysis entropies ( Δ_hydrS ) using the Gibbs equation. The entropy values are a large negative, that pointed on the preliminary complex formation between adenosine phosphates and water before the breaking of P-O bonds or P-O-C fragments in its.

Keywords

Glycoside Phosphates, Adenosine Phosphates, Heat of Combustion, Heat of Formation

Conflicts of Interest

The authors declare no conflicts of interest.

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