Abstract
We have studied prop-2-en-1-imine (1), prop-2-enal (2), ethane-1,2-diimine (3), ethanedial (4), and 2-iminoacetaldehyde (5) to investigate the influence of the negative hyperconjugation in π-π* interaction with the substitution of =CH2 by =NH and/or =O in trans-buta-1,3-diene (6). The analyzes of the π-π* interaction performed from evaluation of the π molecular orbital diagrams and electron localization function method demonstrated, that compared to 6, the substituted compounds 1-5 presented lower electron conjugation, especially in the structures bearing =O. The geometric parameters, natural bond orders, and topological analysis realized by quantum theory of atoms in molecules method indicated a predominant C-C and C=C character for the simple and double C-C bonds in the substituted compounds, 1-5, as compared to 6. Compound 4 had the highest enthalpy of formation, which reflected the lowest π-π* interaction, maintained by the two =O conjugated groups. The natural bond orbital (NBO) and natural resonance theory (NRT) methods revealed that the π-π* electron delocalization in substituted compounds, 1-5, is lower than in 6 from, firstly, of the less favorable interactions: π(X=C) ➔ π*(C=C) and π(X=C) ➔ π*(C=X), despite of the larger π(C=C) ➔ π*(C=X) conjugation, with X = N and/or O, of 1-5 than π(C=C) ➔ π*(C=C) of 6. But, most importantly, the weight of the interaction: nπ(O) ➔ σ*(C-C), was determined from NBO and NRT methods as proportional to the π-π* conjugation and thus demonstrating be decisive to establish the level of π electronic delocalization.
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Acknowledgments
The authors thank the Brazilian agencies Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)/Programa de Apoio à Pós-Graduação (PROAP), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) (Grants 304447/2010-2 and 442384/2014-9), and São Paulo Research Foundation (FAPESP, Fundação de Amparo à Pesquisa do Estado de São Paulo) (Grants 2008/02677-0, 2014/23604-1 and 2014/50265-3) for financial support. S.E.G. thanks CNPq for research fellowships (Grants 304393/2013-4 and 308254/2016-3). R.P.O. thanks FAPESP for undergraduate and graduate fellowships (grants 2009/08712-4, 2011/20351-7 and 2015/15176-2). We also acknowledge Ali Faez Taha for technical assistance and Cynthia M. C. Prado Manso for revising the manuscript.
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Orenha, R.P., Vessecchi, R. & Galembeck, S.E. The influence of the negative hyperconjugation is relevant for the analysis of the π-π* conjugation with the mono-substitution and di-substitution of H2C= by O= and/or HN= in trans-buta-1,3-diene?. Struct Chem 29, 847–857 (2018). https://doi.org/10.1007/s11224-017-1070-4
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DOI: https://doi.org/10.1007/s11224-017-1070-4