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Thermochemical properties of trialkylarsenites

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Abstract

The heats of the reaction of sodium with ethyl and methyl alcohol were determined by calorimetry. The difference in the standard heats of the formation of triethylarsenite and arsenic trichloride was obtained by calorimetration of the reaction of arsenic trichloride with sodium ethylate, the value of which was −382.42 ± 3.60 kJ/mol. The standard enthalpies of formation were determined from a critical analysis of all data on thermochemistry of trialkylarsenites for the following compounds: triethylarsenite Δf H ℴ298 [(C2H5O)3As(liquid)] = (−704.38 ± 3.85) kJ/mol; trimethylarsenite Δf H ℴ298 [(CH3O)3As(liquid)] = (−599.36 ± 1.88) kJ/mol. The values of standard enthalpies of formation were not adjusted for the following substances in liquid state: arsenic trichloride (−321.96 ± 3.85 kJ/mol), tris-(diethylamido)arsenic(III) As(NEt2)3(liquid) (−129.81 ± 4.41 kJ/mol), tri-n-propylarsenite (−720.61 ± 4.49 kJ/mol), triisopropylarsenite (−756.11 ± 4.65 kJ/mol), tri-n-butylarsenite (−775.11 ± 4.53 kJ/mol), and triisobutylarsenite (−809.71 ± 4.59 kJ/mol). The use of sodium alcoxide solutions for the calorimetration of halogen anhydrides of various acids was demonstrated.

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Authors and Affiliations

  1. State Institute of Technology of Organic Synthesis, Saratov oblast, Shykhany, Russia

    B. A. Knyazev & V. F. Vakher

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  1. B. A. Knyazev
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  2. V. F. Vakher
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Correspondence to B. A. Knyazev.

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Original Russian Text © B.A. Knyazev, V.F. Vakher, 2011, published in Zhurnal Fizicheskoi Khimii, 2011, Vol. 85, No. 5, pp. 892–898.

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Knyazev, B.A., Vakher, V.F. Thermochemical properties of trialkylarsenites. Russ. J. Phys. Chem. 85, 804–810 (2011). https://doi.org/10.1134/S0036024411050165

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