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Growing Science » Current Chemistry Letters » Theoretical calculations of the relative pKa values of some selected aromatic arsonic acids in water using density functional theory

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Current Chemistry Letters
ISSN 1927-730x (Online) - ISSN 1927-7296 (Print)
Quarterly Publication
Volume 5 Issue 1 pp. 7-18, 2016

Theoretical calculations of the relative pKa values of some selected aromatic arsonic acids in water using density functional theory Pages 7-18 Right click to download the paper Download PDF

Authors: Behzad Khalili, Mehdi Rimaz

📋 Author Affiliations:
Behzad Khalili ORCID 1, Mehdi Rimaz2
1 Department of Chemistry, Faculty of Siences, University of Guilan, P.O. Box 41335-1914, Rasht, Iran
2 Department of Chemistry, Payame Noor University, P.O. Box 19395-3697, Tehran, Iran
doi 10.5267/j.ccl.2015.10.002
Crossref Source: CrossRef

🔑 Keywords: Aqueous media, Arylarsonic acid, DFT study, Relative pKa

Abstract: With the focus on calculating the equilibrium constant (Ka) of arsonic acids (RAsO(OH)2) in aqueous media, the behavior of both neutral and negatively charged species of some arsonic acids have been considered through the isodesmic reaction scheme with polarized continuum model of solvation. The relative pKa values of a number of arsonic acids were calculated using density functional theory (DFT), with methylarsonic acid (CH3AsO(OH)2) used as a reference molecule. Various basis sets such as (6-31G(d), 6-31+G(d), 6-311++G(d,p) and 6-311++G(2d,2p)) in conjunction with B3LYP computational method were examined. Finally the latter one was found to give better results. The results of applied B3LYP 6-311++G(2d,2p) method for pKa values of 25 arsonic acids in aqueous media showed good agreement with corresponding experimental pKa values. In this level of theory the average error was less than 0.3 pKa units. The type of substituent affected the acid strength, with electron withdrawing substituents lowering the pKa and electron releasing groups increasing it.

How to cite this paper
APA: Khalili, B & Rimaz, M. (2016). Theoretical calculations of the relative pKa values of some selected aromatic arsonic acids in water using density functional theory. Current Chemistry Letters, 5(1), 7-18.
Chicago/Turabian: Khalili, B & Rimaz, M. 2016. "Theoretical calculations of the relative pKa values of some selected aromatic arsonic acids in water using density functional theory." Current Chemistry Letters 5, no. 1 (2016): 7-18.
AMA: Khalili, B & Rimaz, M. Theoretical calculations of the relative pKa values of some selected aromatic arsonic acids in water using density functional theory. Current Chemistry Letters. 2016;5(1):7-18.

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