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On the aggregative properties of rhodamine 6G in ethanolic solutions

โœ Scribed by E. Ghomashchi; A. Ghanadzadeh; M.G. Mahjani; M. Hasanpour; H.Zamanpour Niavaran

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
519 KB
Volume
47
Category
Article
ISSN
1386-1425

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โœฆ Synopsis

A new experimental technique has been developed whereby the observation of the absorption bands due to the tetrameric species of rhodamine 6G in ethanolic solutions could become possible for the first time. The excitonic treatment of the electronic data backed by the 'H NMR and vibrational studies suggest a coplanar structure for the dimers whereas the interaction between the parallel planes at a twisted angle of 8= 108" can constitute the tetrameric aggregates. The nature of the transitions involved in the absorption spectra are shown to be vibronic. The symmetry considerations have therefore been taken into account in order to ascertain the validity of the proposed structure for the tetramers.

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Concentration-dependent changes of absorption spectra of rhodamine 6G (R6G) embedded in silica gel films have been investigated. Dimers of R6G molecules in the gel matrix have been found at concentrations of about 0.1 M. The dimer and monomer spectra as well as the dimerization critical radius have