pH dependent spectral properties and electronic structure of benzothiazol containing cyanine dyes

The absorption and emission properties of some cyanine dyes over a range of 8 pH units are presented. Theoretical investigations of their electronic structure in the ground and excited states have been undertaken and the nature of the electronic transitions in the protonated and non-protonated forms is rationalised. (C) 2008 Elsevier Ltd. All rights reserved.