Next generation QTAIM for scoring molecular wires in E-fields for molecular electronic devices
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The effect of a varying, directional E x , E y, and E z electric field on the ethene molecule was investigated using next‐generation quantum theory of atoms in molecules (QTAIM). Despite using low E ‐field strengths that are within the realm of experiment and do not measurably alter the molecular geometry, significant changes to the QTAIM properties were observed. Using conventional QTAIM, the shifting of the C─C and C─H bond critical points (BCPs) demonstrates polarization through an interchange in the size of the atoms involved in a bond, since a BCP is located on the boundary between a pair of bonded atoms. Next‐generation QTAIM, however, demonstrates the polarization effect more directly with a change in morphology of the 3‐D envelope around the BCP. Modest increases of ≈ 2% in the ellipticity ε of the BCP were uncovered when the C─C bond was aligned parallel or anti‐parallel to the applied E x ‐field. Significant asymmetries were found in the response of the next‐generation QTAIM 3‐D paths of the C─H bonds to the applied E ‐field. When the E ‐field coincided with the C─C bond, the BCP moved in response and was accompanied by the envelope constructed from 3‐D next‐generation paths. The response displayed a polarization effect that increased with increasing magnitude of the E x ‐field parallel and anti‐parallel to the C─C bond. Our analysis demonstrates that next‐generation QTAIM is a useful tool for understanding the response of molecules to E ‐fields, for example, for the screening of molecular wires for the design of molecular electronic devices.
Azizi , A , Momen , R , Fruchtl , H , van Mourik , T , Kirk , S R & Jenkins , S 2019 , ' Next generation QTAIM for scoring molecular wires in E-fields for molecular electronic devices ' , Journal of Computational Chemistry , vol. Early View . https://doi.org/10.1002/jcc.26137
Journal of Computational Chemistry
Copyright © 2019 Wiley Periodicals, Inc. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1002/jcc.26137