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Structural Chemistry

, Volume 27, Issue 3, pp 801–807 | Cite as

Ab initio study of charge transfer between lithium and para-disubstituted benzenes

  • Nina Sadlej-SosnowskaEmail author
Original Research

Abstract

The present work examines how substituents affect the interaction of lithium with the benzene ring and considers whether two configurations, “loose” and “tight,” can be found for the investigated set of complexes as in the lithium complexes with polyaromatic hydrocarbons. The two conformations were actually found for the electron-donating substituents, whereas for the electron-withdrawing substituents, CF3 and NO2, only tight conformation could be optimized. For complexes in the loose conformation [with the N(CH3)2, NH2, OH, H, Cl, and CH3 substituents], the transfer of electron density was directed from the region occupied by a disubstituted benzene to that occupied by Li. The amount of transferred density was very similar for all the complexes (0.21–0.25 a.u.). By contrast, in the tight complexes, the density transfer direction was opposite and the amount of the transferred density depended on the electronegativity of the substituents on benzene ring, being −0.09, −0.09, −0.13, −0.15, −0.15, −0.20, and −0.30 a.u. for N(CH3)2, NH2, OH, H, Cl, CF3, and NO2, respectively. Geometries of the loose and tight conformations differed notably. The six-membered ring was significantly more warped in the tight conformation than in the loose one: In the latter, the ring was nearly planar, whereas in the former, the ring had the boat structure.

Keywords

Transfer of electron density Complex with Li Disubstituted benzenes 

Notes

Acknowledgments

The computing Grant G44-18 from the Interdisciplinary Center for Mathematical and Computer Modeling (ICM) of Warsaw University and the financial support from the Polish Ministry of Science and Higher Education are gratefully acknowledged. We also thank Dr. Douglas J. Fox from Gaussian Inc. for his helpful assistance.

Supplementary material

11224_2015_632_MOESM1_ESM.doc (402 kb)
Supplementary material 1 (DOC 402 kb)

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.National Medicines InstituteWarsawPoland

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