Abstract

The complexes p-ClC 6H 4AsX 2 · nL (L = pyridine, β- or γ-picoline; X = Cl, Br or I; n = 1, 1.5 or 2) were synthesized and characterized by melting point, elemental analysis, thermogravimetric studies and IR spectroscopy. From the enthalpies of dissolution (in 25 vol. % ethanolic ethanolamine) of the p-chlorophenyldihaloarsines-ligand complexes at 298.15 K, the standard enthalpies (Δ r H ⊖) for the Lewis acid-base reactions were determined. From Δ r H ⊖ values and thermochemical parameters for the arsines and the ligands, standard enthalpies for the complexes were calculated: enthalpy of formation Δ f H ⊖; enthalpy of decomposition Δ D H ⊖; lattice enthalpy Δ M H ⊖; enthalpy of the Lewis acid-base reaction in the gaseous phase Δ r H ⊖(g). The mean standard enthalpies of arsenic-nitrogen bonds were estimated.

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