title: Can the electronegativity equalization method predict spectroscopic properties?
abstract: The electronegativity equalization method is classically used as a method allowing the fast generation of atomic charges using a set of calibrated parameters and provided knowledge of the molecular structure. Recently, it has started being used for the calculation of other reactivity descriptors and for the development of polarizable and reactive force fields. For such applications, it is of interest to know whether the method, through the inclusion of the molecular geometry in the Taylor expansion of the energy, would also allow sufficiently accurate predictions of spectroscopic data. In this work, relevant quantities for IR spectroscopy are considered, namely the dipole derivatives and the Cartesian Hessian. Despite careful calibration of parameters for this specific task, it is shown that the current models yield insufficiently accurate results.
authors.affiliation: Center for Molecular Modeling (CMM), Ghent University, 9000 Gent, Belgium. Electronic address: Toon.Verstraelen@UGent.be.
authors.forename: T
authors.initials: T
authors.lastname: Verstraelen
authors.affiliation: Ghent University, Department of Inorganic and Physical Chemistry, Krijgslaan 281 (S3), 9000 Gent, Belgium.
authors.forename: P
authors.initials: P
authors.lastname: Bultinck
mesh_terms: D000465:Algorithms; D002138:Calibration; D008956:Models, Chemical; D013055:Spectrophotometry, Infrared / Q000379:methods*
keywords: Dipole derivatives; Dipole moment; Electronegativity equalization; Hirshfeld-I; Infrared spectroscopy; Molecular mechanics