Insoluble Polymer-Supported Porphyrins as Photosensitizers

Ribó, Josep M.; Sese, Maria L.; Trull, Francesc R.

doi:10.1007/978-3-642-73151-8_51

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“…(1975), and others. Related to this, Byteva and Gurinovich (1987) described the luminescence of O,( IAg), sensitized by an immobilized porphyrin, and some of us have recently reported (Ribo et al, 1988(Ribo et al, , 1989 on the photosensitizing properties of several polystyrene-bound porphyrins. One of the polymer-bound porphyrin systems studied by the latter authors had nitro groups close to the polymer binding sites (see l g in Scheme 1).…”

Section: In T R 0 Duct I 0 Nmentioning

confidence: 93%

Polymer Bound Pyrrole Compounds–vi. Photophysical Properties of Monomeric Models for Polystyrene‐bound Porphyrins

Nonell

Sese

Mártire

et al. 1991

Photochem & Photobiology

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Abstract— Several porphyrin esters used as models for polystyrene‐bound porphyrins have been prepared and their excited states have been studied by laser flash photolysis, IR phosphorescence of singlet molecular oxygen, O2(1Δg), and steady‐state fluorescence. The photophysical properties of the porphyrin esters in solution are affected by the presence of nitro group(s) in the chain. In this case, an important decrease in φf, φT and φδ (to ca 0.7–0.4 of the value for the parent dimethyl ester) is observed. This is mainly due to intramolecular electron‐transfer quenching [by the nitro group(s)] of the first excited singlet state of the porphyrin. The thermodynamic feasibility of this deactivation pathway has been confirmed polarographically. Quenching of the porphyrin triplet state and of O2(1Δg) by the nitro groups is negligible. The present conclusions explain also the results obtained previously for the photooxidation of bilirubin sensitized by the parent insoluble polystyrene‐bound porphyrins. In that case the photooxidation rates were correlated directly with the quantum yield of O2(1Δg) production by the sensitizer. The consequences of these results for the use of polystyrene‐bound porphyrins in sensitized photooxidation processes are discussed.

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Section: In T R 0 Duct I 0 Nmentioning

confidence: 93%