Indotricarbocyanine dyes relevant for photodynamic therapy and their radicals: Substituent effects studied by optical and electrochemical methods

Non-aqueous electrochemistry of rhodamine B acylhydrazone

“…5). Broad and unresolved ESR spectra were previously observed for electrogenerated radical dications of cyanine dyes with a highly delocalized odd electron 25,32 as well as for photogenerated cyanine 33 and rhodamine radicals. 34 Since 0.6 V is slightly above the first anodic wave in the cyclic voltammograms for RBA (recall Fig.…”

“…21 Electrochemical properties of organic dyes are often studied in MeCN. 10,[22][23][24][25] This solvent is electrochemically inert in a wide range of potentials. 26 Performing electrochemical studies in non-aqueous deaerated media allows us to avoid additional reactivity and concentrate on the redox processes involving compounds under study rather than their interactions with reactive intermediates (e.g., reactive oxygen species) or water.…”