Efficient Estimation of Formation Enthalpies for Organic Compounds with Local Coupled-Cluster Methods

Published

September 20, 2018

Author(s)

Yauheni Paulechka, Andrei F. Kazakov

Abstract

Efficient estimation of the enthalpies of formation for closed-shell organic compounds \emph{via} atom-equivalent-type computational schemes and with the use of different local coupled-cluster with single, double, and perturbative triple excitations (CCSD(T)) approximations was investigated. Detailed analysis of established sources of uncertainty, inclusive of contributions beyond frozen-core CCSD(T) and errors due to local CCSD(T) approximations and zero-point energy anharmonicity, suggests the lower limit of about 2~kJ$\cdot$mol$^{-1}$ for the expanded uncertainty of the proposed estimation framework. Among the tested computational schemes, the best-performing cases demonstrate expanded uncertainty of about 2.5~kJ$\cdot$mol$^{-1}$, based on the analysis against 44 critically-evaluated experimental values. Computational efficiency, accuracy commensurable with that of a typical experiment, and absence of the need for auxiliary reactions and additional experimental data offer unprecedented advantages for practical use, such as prompt validation of existing measurements and estimation of missing values, as well as resolution of experimental conflicts.

Citation

Journal of Chemical Theory and Computation

Volume

14

Pub Type

Journals

Download Paper

https://doi.org/10.1021/acs.jctc.8b00593

Local Download

Citation

Paulechka, Y. and Kazakov, A. (2018), Efficient Estimation of Formation Enthalpies for Organic Compounds with Local Coupled-Cluster Methods, Journal of Chemical Theory and Computation, [online], https://doi.org/10.1021/acs.jctc.8b00593 (Accessed October 15, 2024)