Emission of thioflavin T and its off-on control in polymer membranes

Retna Raj, C. ; Ramaraj, R. (2001) Emission of thioflavin T and its off-on control in polymer membranes Photochemistry and Photobiology, 74 (6). pp. 752-759. ISSN 0031-8655

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Official URL: http://onlinelibrary.wiley.com/doi/10.1562/0031-86...

Related URL: http://dx.doi.org/10.1562/0031-8655(2001)0740752EOTTAI2.0.CO2

Abstract

The absorption and emission spectral properties of thioflavin T (TFT+) in Nafion (Nf) and cellulose matrices have been studied. Formation of the emittive dimer is observed in both matrices. The monomer TFT+ emission is blueshifted in Nafion membrane (Nf), whereas it is redshifted in cellulose membrane when compared with the emission in aqueous solution. The dimer emission of TFT+ in the Na+-Nf membrane undergoes off-on switching with acids and alkalis. The TFT+ molecule undergoes protonation in the H+-Nf and the protonated dye is fluorescent. The dimer emission of TFT+ is not observed in the dry H+-Nf membrane because of the protonation of the TFT+ molecule. The diffusion coefficient and the free energy of hydrophobic interaction for the TFT+ molecule in the Nf membrane are calculated. The TFT+ molecule experiences hydrophobic and electrostatic interactions in the Nf matrix, whereas it experiences a polar environment in the cellulose membrane. The 3D emission spectral studies support the formation of the emittive dimer in both Nf and cellulose matrices.

Item Type:Article
Source:Copyright of this article belongs to John Wiley and Sons.
ID Code:39719
Deposited On:14 May 2011 14:23
Last Modified:14 May 2011 14:23

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