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INTERPRETATION DES MODIFICATIONS SPECTRALES SUBIES PAR LES HYDROCARBURES AROMATIQUES LORS DE LEUR INTERCALEMENT AU SEIN DES ACIDES NUCLEIQUES
Author(s) -
MANTIONE MARIEJOSÉ
Publication year - 1973
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1973.tb06346.x
Subject(s) - bathochromic shift , chemistry , excited state , pyrene , ultraviolet , polarizability , fluoranthene , fluorescence , photochemistry , molecule , physics , atomic physics , optics , organic chemistry
— This work presents a calculation of the large bathochromic shift observed in the ultraviolet spectrum of aromatic hydrocarbons (such as pyrene and 3,4 benzopyrene) when they are stacked with nucleotides and polynucleotides. For this, an estimation of the increase of molecular polarizability in the excited states is necessary. This increase is responsible for the fact that the stabilization of the stacked hydrocarbon by dispersive interactions with base pairs becomes stronger in the excited state. The calculated increases of stabilization energies are in satisfactory agreement with the observed spectral shifts.