Prediction of proton affinities of organic molecules using the any-particle molecular-orbital second-order proton propagator approach

Literature Information

Publication Date 2016-09-08
DOI 10.1039/C6CP05128F
Impact Factor 3.676
Authors

Laura Pedraza-González, Jonathan Romero, Jorge Alí-Torres, Andrés Reyes


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Abstract

We assess the performance of the recently developed any-particle molecular-orbital second-order proton propagator (APMO/PP2) scheme [M. Díaz-Tinoco, J. Romero, J. V. Ortiz, A. Reyes and R. Flores-Moreno, J. Chem. Phys., 2013, 138, 194108] on the calculation of gas phase proton affinities (PAs) of a set of 150 organic molecules comprising several functional groups: amines, alcohols, aldehydes, amides, ketones, esters, ethers, carboxylic acids and carboxylate anions. APMO/PP2 PAs display an overall mean absolute error of 0.68 kcal mol−1 with respect to experimental data. These results suggest that the APMO/PP2 method is an alternative approach for the quantitative prediction of gas phase proton affinities. One novel feature of the method is that a PA can be obtained from a single calculation of the optimized protonated molecule.

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Physical Chemistry Chemical Physics

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