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Influence des interactions lointaines sur la transition secondaire du chromophore benzénique dans des molécules du type φ(CH2)nX1X2

Authors
Journal
Spectrochimica Acta Part A Molecular Spectroscopy
0584-8539
Publisher
Elsevier
Publication Date
Volume
38
Issue
3
Identifiers
DOI: 10.1016/0584-8539(82)80010-x

Abstract

Abstract Long range interactions in molecules, whose type is φCHX 1X 2 or φCH 2CHX 1X 2, between X 1–X 2 and the benzene chromophore, induce a definite spectroscopic behaviour in the near u.v. range. We have studied molecules where X 1 and/or X 2 are NH 2, NH + 3, CO − 2, CO 2H or H. The simple pattern involving σ, π interactions through CαH bonds, extended also to others through-bonds interactions, allows us to understand the spectroscopic intensities. In particular the surprising behaviour encountered with phenylmalonic acid, for which very different and strong interactions in the protonated and unprotonated species produce the same spectra, when smaller interactions in others molecules produce definite changes, is understood.

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