Abstract
The complexes PhAsX 2·L, where L = pyridine (py), β- or γ-picoline (β- or γ-pico) and X = Cl, Br or I, were synthesized and characterized by melting point, elemental analysis, thermogravimetric studies and infrared spectroscopy. The standard enthalpies (Δ r H θ) for the Lewis acid/base reactions were determined from the enthalpies of dissolution in 25% ethanolamine in ethanol of the complexes, phenyldihaloarsines and ligands at 298.15 K. The following thermochemical parameters for the complexes were calculated from Δ r H θ values and thermochemical cycles: the standard enthalpies of formation (Δ f H θ), the standard enthalpies of decomposition (Δ D H θ), the lattice standard enthalpies (Δ M H θ) and the standard enthalpies of the Lewis acid/base reactions in the gaseous phase (Δ r H θ(g)). The mean standard enthalpies of arsenic-nitrogen bonds ( D(As-N)) were estimated.
Published Version
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