Abstract
Quantum chemical computations at M06-2X/def2-TZVPD level of theory were employed to compute structural and thermodynamic properties of gaseous donor-acceptor complexes IX·LB [X = I, Cl; LB = trimethylamine, triethylamine, pyridine, 2-aminopyridine, 4,4′-bipyridine, pyrazine, 1,2-bis(4-pyridyl)ethylene, 1,2-bis(4-pyridyl)ethane]. Iodine monochloride is a stronger Lewis acid compared to the molecular iodine. With respect to homogeneous gas phase dissociation into components, the complex of ICl with triethylamine is the most stable and the complex of I2 with pyrazine is the least stable. It is shown that dissociation enthalpies do not correlate with proton affinity of the Lewis base, but there is a good correlation between dissociation enthalpies and I–X bond lengthening upon complex formation. This allows to estimate the stability of the complex based on its structural data.
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The work was carried out with the financial support of the Russian Science Foundation (RSF grant 23-13-00314) using the equipment of the Computing Center of St. Petersburg University.
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Pomogaeva, A.V., Lisovenko, A.S. & Timoshkin, A.Y. Stability of Molecular Complexes of Iodine and Iodine Monochloride with Nitrogen-Containing Donors. Russ J Gen Chem 94 (Suppl 1), S40–S46 (2024). https://doi.org/10.1134/S1070363224140068
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DOI: https://doi.org/10.1134/S1070363224140068