Photophysical, photochemical and electrochemical properties of water soluble silicon, titanium and zinc phthalocyanines

The synthesis and photophysical properties of novel cationic tetra pyridiloxy substituted aluminium, silicon and titanium phthalocyanines in water

“…The quaternized water-soluble aluminium(III) phthalocyanine complex (4a) gave higher fluorescence yield in the presence of CEL, compared to pH 11 alone, suggesting that there was some small aggregation in this complex. An improvement in^F values in the presence of CEL was also reported for the corresponding tetrasulfonated derivatives [40], with lower values for these complexes due to more extensive aggregation.…”

Effect of pH on Acid-Base and Photophysicochemical Properties of 2,3,9,10,16,17,23,24-Octacarboxyphthalocyanines in Aqueous Media

“…It should be noted that photophysical and photochemical properties of this complex in aqueous medium and in the presence of bovine serum albumin were studied by Nyokong et al [21,27] We found that presence of Cremophor EL made no difference in their absorption and fluorescence maxima. Unionized acidic and intermediate tetraanionic forms of ZnPc oc were studied for the first time in this paper.…”

“…Quantum yields of fluorescence (F fl ) for ZnPc(COOH) 8 and ZnPc(COOH) 4 (COONa) 4 were estimated relatively to that of octaanion (F fl = 0.18 at pH 10, [21] similar value can be assumed for ZnPc oc octaanion in the presence of Cremophor EL). It was found that F fl for the three differently ionized forms of ZnPc oc were, however, not significantly (within experimental error of 10 %), affected by ionization (Table 2).…”

Photoelectrochemical characterization of electrodepositedZnOthin films sensitized by octacarboxymetallophthalocyanine derivatives

“…They are attractive as chromophores for light-driven processes such as photoredox reactions in solutions, photodynamic therapy of cancer, photoelectrochemical reactions and as photovoltaic cells [11][12][13][14] due to their known exceptional stability, intense absorption in the red and near infra-red regions of the solar spectrum, non-toxicity, and ease of oxidation and reduction [15]. MPcs are particularly interesting since groups such as sulfonic or carboxylic groups as substituents on their rings render them water-soluble [16][17][18][19]. These groups are also very important in their application as sensitizers in DSSCs, since proper chemical binding to the semiconductor oxide surface requires the dye molecules to carry acid functionalities to allow for formation of covalent bonds to the hydroxide groups on the surface of the growing oxide [20].…”