pH-Induced Interconversion between J-Aggregates and H-Aggregates of 5,10,15,20-Tetrakis(4-sulfonatophenyl)porphyrin in Polyelectrolyte Multilayer Films

Egawa, Yuya; Hayashida, Ryosuke; Anzai, Jun Ichi

doi:10.1021/la701957b

Cited by 94 publications

(80 citation statements)

References 32 publications

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“…Therefore, Fig. 1 shows that the adsorbed porphyrins are a layer of J-aggregates, which have been observed previously in the layer-by-layer films [19][20][21][22].…”

Section: àsupporting

confidence: 80%

Porphyrin “Mille-Feuilles” photo-electrodes

Tan

Hojeij

2008

Journal of Electroanalytical Chemistry

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“…Therefore, Fig. 1 shows that the adsorbed porphyrins are a layer of J-aggregates, which have been observed previously in the layer-by-layer films [19][20][21][22].…”

Section: àsupporting

confidence: 80%

Porphyrin “Mille-Feuilles” photo-electrodes

Tan

Hojeij

2008

Journal of Electroanalytical Chemistry

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“…These zwitterionic forms have a tendency to form J-aggregates which show a red shifted Soret band with respect to the monomer's ones [23]. However in this work no evidence of aggregation was found for studied concentration of TPPS (1.710 -6 mol.dm -3 ) at different solvent mixture.…”

Section: Protonation Constant Of Tppscontrasting

confidence: 56%

Solvent effect on protonation of tpps in water-DMF mixtures

Farajtabar¹,

Faeli²

2017

Bull. Chem. Soc. Eth.

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ABSTRACT. The protonation of 5,10,15,20-tetrakis(4-sulfonatophenyl)porphyrin was investigated in aqueous solutions of N,N-dimethyformamide at 25 C and 0.1 mol.dm -3 sodium perchlorate. The solvent effect on value of protonation constant was examined by using the linear solvation energy relationship concept. The value of logK1, logK2 and logKt was correlated with the macroscopic (dielectric constant) and microscopic Kamlet-Taft parameters (,  and *) of binary mixtures. The solvent effects were analyzed in the terms of Kamlet, Abboud and Taft model (KAT). Multiple linear regression were used to find the contribution of the microscopic parameters containing  (hydrogen-bond acidity), * (dipolarity/polarizability) and  (hydrogen-bond basicity). It was found that  and  were the most predominant descriptors. Also, relationship with reciprocal of dielectric constant was obtained based on Born's model, showing the significance of specific solute-solvent interactions. Therefore the hydrogen bonding interactions between solute and solvent components are mainly responsible for the change in protonation constants of 5,10,15,20-tetrakis(4-sulfonatophenyl)porphyrin in water-N,N-dimethyformamid binary mixtures.

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“…A further pH-sensitive LbL film was constructed using 5,10,15,20-tetrakis(4-sulfonatophenyl)-porphyrin (TPPS) and PAH. 95 TPPS formed J-aggregates in the film at pH 1.5, and H-aggregated TPPS was formed at pH 3.0 or higher. The interconversion between J-and H-aggregates in the film was associated with changes in the absorption spectra; the H-aggregate showed an absorption maximum at 405 nm, whereas absorption maxima at 484 and 691 nm were observed for the J-aggregate.…”

Section: Optical Biosensorsmentioning

confidence: 95%

Layer-by-layer Thin Films and Microcapsules for Biosensors and Controlled Release

2012

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We present an overview of the preparation and properties of layer-by-layer (LbL) deposited thin films and microcapsules in relation to their use in the development of biosensors and controlled release systems. Enzyme biosensors can be constructed by immobilizing enzymes on the surface of electrodes by LbL deposition without loss of their catalytic activity. In addition to synthetic polymers, binding proteins, such as avidin and lectin, are also used for constructing LbL films through avidin-biotin and lectin-sugar interactions. The performance characteristics of LbL film-based biosensors can be tuned by controlling the number of layers and by the choice of film components. The permeability of polyelectrolyte LbL films to ions and molecules is discussed in relation to the use of the films for eliminating interference in biosensors. The possible use of polysaccharide LbL film-coated electrodes for the construction of biosensors is highlighted, and examples of LbL film-and microcapsule-based optical sensors are described. We then focus on the use of LbL films and microcapsules as vehicles for controlled release, in particular on recent progress in the controlled release of insulin from LbL films and microcapsules. LbL films composed of insulin and polymers are sensitive to environmental pH, and release insulin in response to pH changes, suggesting that insulin LbL films can be used in the development of orally administered insulin. The construction of glucose-dependent insulin release systems using LbL insulin microcapsules functionalized with phenylboronic acid, lectin, and glucose oxidase is also examined.

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pH-Induced Interconversion between J-Aggregates and H-Aggregates of 5,10,15,20-Tetrakis(4-sulfonatophenyl)porphyrin in Polyelectrolyte Multilayer Films

Cited by 94 publications

References 32 publications

Porphyrin “Mille-Feuilles” photo-electrodes

Porphyrin “Mille-Feuilles” photo-electrodes

Solvent effect on protonation of tpps in water-DMF mixtures

Layer-by-layer Thin Films and Microcapsules for Biosensors and Controlled Release

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