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Conformation analysis of a novel fluorinated chalcone

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Abstract

Chalcones are an important class of natural compounds that exhibit numerous biological activities. In this paper, we report the synthesis and characterization of new fluorinated chalcone (FCH). The molecular geometry was determined by means of single crystal X-ray diffraction, and density functional theory (DFT) at B3LYP, M06-2X functionals and MP2 method, with the 6-311++G(d,p) basis set, was applied to optimize the ground state geometry and to study the molecular conformational stability. The molecular electrostatic potential (MEP) was also investigated at the same level of theory in order to identify and quantify the possible reactive sites. The FCH crystallizes in the centrossymmetric space group \( P\overline{1} \) with two independent conformers (α and β) in the asymmetric unit cell. The α conformer is arranged in planar layer whereas the β creates a layer of non-classical dimer along c axis, that differ from α in about 11° in the orientation of phenyl groups. The stabilization of the β conformer is achieved by C−H···π arrangement. The small energy difference between the conformers (0.086 kcal mol−1) and the absence of activation energy indicates that the conversion between them can takes place at room temperature and the β isomer is stable only in solid state. The FCH most electrophilic site occurs on the oxygen atom from the carboxyl group with absolute MEP value of about −52 kcal mol−1 whereas the MEP value calculated for F site is about −23 kcal mol−1.

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Acknowledgements

The authors would like to acknowledge the National Council of Technological and Scientific Development (CNPq, Brazil) for financial support.

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Authors and Affiliations

  1. Ciências Exatas e Tecnológicas, Universidade Estadual de Goiás, 75132-400, Anápolis, GO, Brazil

    Paulo S. Carvalho Jr, Jean M. F. Custodio, Wesley F. Vaz, Cassio C. Cirilo, Amanda F. Cidade, Gilberto L. B. Aquino, Solemar S. Oliveira, Ademir J. Camargo & Hamilton B. Napolitano

  2. Instituto de Patologia Tropical e Saúde Pública, Universidade Federal de Goiás, 74605-050, Goiânia, GO, Brazil

    Dulcinea M. B. Campos, Pedro Cravo & Clarimar J. Coelho

  3. Centro Universitário de Anápolis, 75083515, Anápolis, GO, Brazil

    Dulcinea M. B. Campos, Pedro Cravo & Clarimar J. Coelho

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  1. Paulo S. Carvalho Jr
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  2. Jean M. F. Custodio
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Correspondence to Hamilton B. Napolitano.

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This paper belongs to Topical Collection VI Symposium on Electronic Structure and Molecular Dynamics – VI SeedMol

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Carvalho, P.S., Custodio, J.M.F., Vaz, W.F. et al. Conformation analysis of a novel fluorinated chalcone. J Mol Model 23, 97 (2017). https://doi.org/10.1007/s00894-017-3245-8

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