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metadata.artigo.dc.title: Infrared Fingerprints of nN → σ*NH Hyperconjugation in Hydrazides
metadata.artigo.dc.creator: Andrade, Laize A. F.
Silla, Josué M.
Cormanich, Rodrigo A.
Freitas, Matheus P.
metadata.artigo.dc.subject: Hyperconjugation
Infrared spectroscopy
Infrared fingerprints
Espectroscopia de infravermelho
Impressões digitais infravermelhas
metadata.artigo.dc.publisher: ACS Publications 2017
metadata.artigo.dc.identifier.citation: ANDRADE, L. A. F. et al. Infrared Fingerprints of nN → σ*NH Hyperconjugation in Hydrazides. American Chemical Society, Easton, v. 82, n. 23, p. 12181-12187, 2017.
metadata.artigo.dc.description.abstract: An earlier study demonstrated that hyperconjugation operates in hydrazides by analyzing the N–H stretching mode in gas phase infrared (IR) spectroscopy, and then observing two very distinct bands corresponding to isolated isomers experiencing or not the nN → σ*N–H electron delocalization. The present work reports a chemical method to obtain insight on the hyperconjugation in hydrazide derivatives from solution IR spectroscopy. The analogous amides did not show a νN–H red-shifted band, as the electron donor orbital in the above hyperconjugative interaction does not exist. In addition, the effect of electron withdrawing groups bonded to a nitrogen atom, namely the trifluoroacetyl and the methanesulfonyl groups, was analyzed on the conformational isomerism and on the ability to induce a stronger hyperconjugation in the resulting compounds.
metadata.artigo.dc.language: en_US
Appears in Collections:DQI - Artigos publicados em periódicos

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