Influence of hydrogen bond formation on the photophysics of N-(2,6-dimethyIphenyl)-2,3-naphthalimide

A. Demeter, László Ravasz, T. Bérces

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Abstract

The photophysics of N-(2,6-dimethylphenyl)-2,3-naphthalimide (DMPN) has been investigated in the presence of methanol or fluorinated aliphatic alcohols in n-hexane and carbon tetrachloride solvents. Consecutive two-step hydrogen bonded complex formation is observed in the presence of alcohols. Equilibrium constants are determined for the formation of singly and doubly complexed species. The UV absorption and fluorescence spectra for the singly and doubly complexed DMPN are derived from the measured absorption and fluorescence spectra, respectively, by means of the equilibrium constants. It is concluded from the results that the spectroscopic properties (singlet excitation energy and Stokes shift) of the complexed species are significantly influenced by the Gibbs energy change in the complexation reaction. Quantitatively, a linear relationship is found between the difference of singlet excitation energy of the complexed and uncomplexed species on one hand and the Gibbs energy change in the complexation reaction on the other hand. This observation is explained by means of an energy cycle and Abraham's hydrogen-bond acidity/basicity model. Hydrogen-bond basicity values are determined for singlet excited DMPN and its singly complexed derivative with hexafluoro-2-propanol. Such hydrogen-bond basicity values of excited states are useful for predicting equilibrium constants for complex formation of the given excited state with other hydrogen bond donors. The photophysical properties of DMPN are strongly influenced by hydrogen bond formation. The fluorescence yield increases dramatically with complex formation, which is caused by an increase in the activation energy of the temperature enhanced intersystem crossing and internal conversion processes.

Original languageEnglish
Pages (from-to)4357-4364
Number of pages8
JournalJournal of Physical Chemistry A
Volume108
Issue number19
DOIs
Publication statusPublished - May 13 2004

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Naphthalimides
Hydrogen bonds
hydrogen bonds
Equilibrium constants
Alkalinity
Excitation energy
Fluorescence
Gibbs free energy
Complexation
Excited states
fluorescence
excitation
alcohols
Alcohols
energy
absorption spectra
tetrachlorides
Carbon Tetrachloride
carbon tetrachloride
internal conversion

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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Influence of hydrogen bond formation on the photophysics of N-(2,6-dimethyIphenyl)-2,3-naphthalimide. / Demeter, A.; Ravasz, László; Bérces, T.

In: Journal of Physical Chemistry A, Vol. 108, No. 19, 13.05.2004, p. 4357-4364.

Research output: Contribution to journalArticle

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