Photoexcitation and electron transfer reactions of zinc lipidporphyrins in DMSO

Ohgushi, Takeru; Li, Zi‐Chen; Li, Fu‐Mian; Komatsu, Teruyuki; Takeoka, Shinji; Tsuchida, Eishun

doi:10.1002/(sici)1099-1409(199901)3:1<53::aid-jpp103>3.3.co;2-2

Cited by 2 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although the l values obtained here are in the range of typical values, they are on average smaller than the values obtained from similar systems with non charged reactants (1.1-1.3 eV). 55 The solvent reorganisation energy, l S , can be calculated (eqn. 20) using the dielectric continuum model of Marcus, 54,56 where n is the index of refraction of the solvent of dielectric constant e S and the rest of the parameters are as previously defined.…”

Section: Electron Transfermentioning

confidence: 99%

Steady state and dynamic quenching of zinc tetramethylpyridylporphyrin by methyl viologen ion pairs. Salt effects

Togashi¹,

Costa²

2002

New J. Chem.

View full text Add to dashboard Cite

Section: Electron Transfermentioning

confidence: 99%

Steady state and dynamic quenching of zinc tetramethylpyridylporphyrin by methyl viologen ion pairs. Salt effects

Togashi¹,

Costa²

2002

New J. Chem.

View full text Add to dashboard Cite

“…The UV−vis absorption spectrum of the ZnTPP solution in CH 2 Cl 2 exhibits a well-defined intense Soret band at 418 nm and weak Q-bands at 547 and 585 nm . When the Nf film was dipped in ZnTPP solution, the absorbance at 418 nm ( A 418 ) decreased with the dipping time, as shown in Figure .…”

Section: Resultsmentioning

confidence: 90%

“…The high a value is consistent with the fact that the adsorbed ZnTPP is hardly desorbed in CH 2 Cl 2 . The effective area for ZnTPP adsorption per unit area (1.0 cm 2 ) of the Nf film can be estimated as 22 cm 2 from the value of w s (1.8 × 10 -9 mol cm -2 ) and the approximate area per ZnTPP molecule (2.01 nm 2 ) assumed as a circle with a diameter equal to the molecular size (1.6 nm) . This means that the effective area for ZnTPP adsorption is a factor of 22 larger than the Nf film area.…”

Section: Resultsmentioning

confidence: 99%

Insights into Adsorption of Uncharged Macrocyclic Complexes into a Nafion Film: Adsorption Characteristics and Analysis of Tetraphenylporphyrine Zinc(II)

Yagi

2006

J. Phys. Chem. B

View full text Add to dashboard Cite

Tetraphenylporphine zinc(II) (ZnTPP) was found to be adsorbed from its CH2Cl2 solution into a Nafion (Nf) film. The characteristics of the adsorption of ZnTPP into the Nf film were studied using a visible absorption spectroscopic technique. The initial rate (v0, mol cm(-2) s(-1)) for uptake of ZnTPP was saturated with increasing ZnTPP concentration (c0, M) in the solution. This kinetic profile was analyzed in terms of a Michaelis-Menten model considering preequilibrium of ZnTPP adsorption between the solution and the outer layer of the Nf film, followed by diffusion to an inner bulk region, giving a maximum diffusion reflux of v(max) = (2.2 +/- 0.2) x 10(-13) mol cm(-2) s(-1). This is different from the kinetics for the Nf/phthalocyanine zinc(II) (ZnPc) film, which gives a linear plot of v(0) vs c(0). This can be explained by the relatively slow diffusion of ZnTPP in the film compared to that of ZnPc because of steric factors: ZnTPP contains bulky tetraphenyl moieties attached perpendicular to a porphyrin ring, whereas ZnPc has higher planarity. The isotherm for the adsorption of ZnTPP into the Nf film was analyzed using a Langmuir isotherm equation, yielding an equilibrium constant of (3.6 +/- 1.1) x 10(6) M(-1) and a saturated amount of adsorbed ZnTPP of (1.8 +/- 0.1) x 10(-9) mol cm(-2), suggesting monolayer adsorption of ZnTPP on the hydrophobic polymer network interfacial with hydrophilic transport channels without significant intermolecular overlap. This is in contrast to the multilayer adsorption mode suggested for the ZnPc adsorption. The tetraphenyl moieties could prevent the stacking of ZnTPP for multilayer adsorption.

show abstract

Photoexcitation and electron transfer reactions of zinc lipidporphyrins in DMSO

Cited by 2 publications

References 0 publications

Steady state and dynamic quenching of zinc tetramethylpyridylporphyrin by methyl viologen ion pairs. Salt effects

Steady state and dynamic quenching of zinc tetramethylpyridylporphyrin by methyl viologen ion pairs. Salt effects

Insights into Adsorption of Uncharged Macrocyclic Complexes into a Nafion Film: Adsorption Characteristics and Analysis of Tetraphenylporphyrine Zinc(II)

Contact Info

Product

Resources

About