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Self-association of the molecular forms of Rhodamine 19. Solvent effect

✍ Scribed by F.López Arbeloa; Y.Rodríguez Liebana; E.Cordero Fernández; I.López Arbeloa

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
618 KB
Volume
45
Category
Article
ISSN
1386-1425

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✦ Synopsis

The aggregation characteristics of the zwitterion and the cationic molecular forms of Rhodamine 19 have been determined in aqueous and ethanolic solutions by absorption spectroscopy. Methods for the calculation of the equilibrium constant and the absorption spectrum of the dimer in aqueous solution are developed. From the interpretation of the absorption spectrum of the aggregates by means of the exciton theory, the geometric disposition of the monomers in the aqueous dimers is studied. The thermodynamic parameters of the dimerization equilibrium in aqueous solution are determined. Aggregation does not occur at concentrations lower than 2 x IO-' M in ethanol.

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