Interactions of ruthenium(II) photosensitizers with non-ionic surfactants: the binding region and specific-anion effects

Hauenstein, B. L.; Dressick, Walter J.; Gilbert, T. B.; Demas, J. N.; DeGraff, Β. A.

doi:10.1021/j150653a046

Cited by 26 publications

(22 citation statements)

References 5 publications

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“…We also note that the similarity between the corrected and solution spectra indicate that no new absorbances indicative of dye reaction or decomposition are observed during PEML assembly. The slight peak redshift ($4 nm) of the PEML spectrum relative to the solution spectrum is ascribed to environmental effects within the PEML, consistent with behavior of polypyridyl Ru(II) complexes in other organized environments [37,38].…”

Section: Interference Effects and Correction Modelsupporting

confidence: 65%

Optical interference effect corrections for absorbance spectra of layer-by-layer thin films bearing covalently bound dye

Saydjari

Long

Dressick

et al. 2014

Chemical Physics Letters

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Section: Interference Effects and Correction Modelsupporting

confidence: 65%

Optical interference effect corrections for absorbance spectra of layer-by-layer thin films bearing covalently bound dye

Saydjari

Long

Dressick

et al. 2014

Chemical Physics Letters

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“…The abbreviations for the ligands are bpy = 2,2'-bipyridine, phen = 1,lO-phenanthroline, Ph2phen = 4,7-diphenyl-l,lO-phenanthroline, 5,6-Me2phen = 5,6-dimethyl-l,lO-phenanthroline, and 4,7-Me2phen = 4,7-dimethyl-1,lO-phenanthroline. The BPh4-salt of Ru(4,7-Me,phen),?+ was prepared by metathesis from the perchlorate salt (16). In addition, the cis-Ru(phen),(CN), was prepared by literature methods (17).…”

Section: Methodsmentioning

confidence: 99%

Photophysics and photochemistry of oxygen sensors based on luminescent transition-metal complexes

Carraway¹,

Demas²,

DeGraff³

et al. 1991

Anal. Chem.

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629

454

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A detailed study of the photophysics and photochemistry of polymer-immobilized luminescent transition-metal complex oxygen sensors is presented. Emphasis is on understanding the underlying origin of the nonlinear Stern-Volmer quenching response. Microheterogeneity is important in both photophysical and photochemical behavior, and the nonlinear quenching responses in RTV 118 silicone rubber can be adequately described by a two-site model, although detailed lifetime measurements suggest a more complex Underlying system. Counterion studies with quenching counterions are shown to be useful probes of the structure of the complex in the polymer. While oxygen enhances photochemical instability, singlet oxygen is not directly implicated in sensor decomposition. I n the photochemistry there is at least one reactive and one much less reactive site, although the photochemistry and quenching measurements probably sample different populations of sites. The existence of reactive sites suggests that stability can be enhanced by a preliminary photolysis to eliminate the more reactive sites.

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“…The strength of binding depends on the combination of electrostatic attractions or repulsions and hydrophobic effects [17][18][19][20][21][22]. Davies et al studied the effects of micellar solution on the electron transfer reaction between [Co(terpyr)] 2+ and a series of Co(III)-complexes in varying ligand structure and ionic charge redox reactions of amphiphilic cobalt complexes [23].…”

Section: Introductionmentioning

confidence: 99%

Photoinduced Electron Transfer Reactions of Ruthenium(II) Phenanthroline Complexes with Dimethylaniline in Aqueous and Micellar Media

Sangiliapillai¹,

Ramdass

Rajkumar³

et al. 2014

J Fluoresc

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Four [Ru(NN)(3)](2+) complexes (NN = polypyridine) with ligands of varying hydrophobicity with different charges +2, 0 and -4 were synthesized. The photophysics and photoinduced electron transfer reactions of these Ru(II)-complexes with dimethylaniline (DMA) as the quencher have been studied in aqueous medium and ionic and non-ionic micellar medium. The extent of binding of the complexes with the surfactant interface is evident from the calculated binding constant values (K). Dimethylaniline (DMA) being a neutral quencher, the hydrophobic and electrostatic interactions competing with one another and their combined effect with the surfactants were reported by observing the quenching rate constant (k(q)) values. The formation of anilinium cation radical in transient absorption spectrum confirms the excited state electron transfer reactions of ruthenium(II) complexes with dimethylaniline. The calculated rate constant values (k(q)) are in good agreement with the experimental k(q) values giving quantitative evidence for the bimolecular reductive quenching rate constant for the complexes with DMA. Pseudophase ion exchange model is successfully applied to analyse the quenching data.

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Interactions of ruthenium(II) photosensitizers with non-ionic surfactants: the binding region and specific-anion effects

Cited by 26 publications

References 5 publications

Optical interference effect corrections for absorbance spectra of layer-by-layer thin films bearing covalently bound dye

Optical interference effect corrections for absorbance spectra of layer-by-layer thin films bearing covalently bound dye

Photophysics and photochemistry of oxygen sensors based on luminescent transition-metal complexes

Photoinduced Electron Transfer Reactions of Ruthenium(II) Phenanthroline Complexes with Dimethylaniline in Aqueous and Micellar Media

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