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Dimer formation of a stilbenesulphonic acid salt in aqueous solution
Author(s) -
Alsins Jan,
Björling Mikael,
Furó István,
Egle Valdis
Publication year - 1999
Publication title -
journal of physical organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.325
H-Index - 66
eISSN - 1099-1395
pISSN - 0894-3230
DOI - 10.1002/(sici)1099-1395(199903)12:3<171::aid-poc104>3.0.co;2-7
Subject(s) - chemistry , dimer , aqueous solution , salt (chemistry) , fluorescence , equilibrium constant , molecule , proton nmr , nmr spectra database , photochemistry , spectral line , organic chemistry , physics , quantum mechanics , astronomy
The steady‐state and time‐resolved fluorescence and 1 H NMR spectra of a stilbenesulphonic acid salt, commonly used as an optical brightening agent, was studied as a function of concentration in aqueous solution. The aggregates, formed at higher concentrations, were shown to be predominantly dimers with the central stilbene moieties of the molecules stacked plane‐parallel. The equilibrium constant for the dimer formation at 25 °C was obtained from both NMR and fluorescence measurements. Copyright © 1999 John Wiley & Sons, Ltd.