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|Title:||A high sensitive ion pairing probe (the interaction of pyrenetetrasulphonate and methyl viologen): Salt and temperature dependences and applications|
Perez, Katia R. [UNIFESP]
Pisco, Thiago B.
Pavanelli, David D.
Briotto Filho, Decio
Triboni, Eduardo Rezende
Alves Lima, Francisco das Chagas
Magalhaes, Janildo Lopes
Cuccovia, Iolanda Midea
Gomes, Ligia F.
Politi, Mario J.
Universidade de São Paulo (USP)
Universidade Federal de São Paulo (UNIFESP)
Univ Nove Julho
Univ Fed Piaui
Univ Estadual Piaui
|Keywords:||Pyrenetetrasulphonate methyl viologen|
Charge transfer complex
Ion pair association
|Citation:||Journal of Luminescence. Amsterdam: Elsevier B.V., v. 151, p. 130-137, 2014.|
|Abstract:||The interaction between pyrenetetrasulphonate (PTS) and methyl viologen (MV2+) leads to a 1:1 charge transfer complex (CTC) in the concentration range below mmol L-1 of the ligands. Quantum mechanical calculations show the 1:1 complex having the planar moiety of PTS and the charges of the sulfonate groups stabilized by the twisted rings of the positively charged MV2+ species. the peculiar nature of PTS includes high fluorescence quantum yield (similar to 1), clear specular UV-vis spectra and fluorescence emission images, as well similar S-2 <- S-0 and S-3 <- S-0 transitions as those of S-1 <- S-0, all of them exhibiting well resolved vibrational structure. MV2+ has well known electron-accepting properties that favor the complexation. These features were studied as a function of salt concentration and temperature dependences allowing a detailed comprehension of static and dynamic association processes. Quantum mechanical calculations show the 1:1 stabilization of PTS/MV2+. in addition the effect of urea on the CTC equilibrium is presented, as expected the additive acts towards the non-complexed species (solvated free ions). the fluorescence quenching of MV2+ over PTS highlights is one of the applications of this effect for giant vesicles characterization. (C) 2014 Elsevier B.V. All rights reserved.|
|Appears in Collections:||Em verificação - Geral|
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