Detection of hydrophobic microdomains in anionic polyelectrolytes with tris-(4,7-diphenyl-1,10-phenanthroline)3Cr(III)

Cañete, Paulina; Rı́os, Hernán E.; Vargas, Vı́ctor; Ronco, Silvia; Isaacs, Mauricio; Urzúa, Marcela

doi:10.1016/j.jcis.2007.11.002

Cited by 8 publications

(4 citation statements)

References 30 publications

(44 reference statements)

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“…34À37 This interest is mainly due to its chemical structure and properties such as solubility, biocompatibility, filming, and miscibility. 35,36 However, all these studies have been carried out in solution. Recently, Fang et al 37 found that several anionic derivatives of poly(maleic anhydride-alt-styrene) have low cell toxicity and are effective inhibitors of HIV-1 in a cellular model in vitro.…”

Section: ' Introductionmentioning

confidence: 99%

“…The derivatives of anionic amphiphilic polyelectrolytes of poly(maleic anhydride- alt -styrene) P(MA- alt -St) have received great interest as surfactants and materials in biomedical applications. − This interest is mainly due to its chemical structure and properties such as solubility, biocompatibility, filming, and miscibility. , However, all these studies have been carried out in solution. Recently, Fang et al found that several anionic derivatives of poly(maleic anhydride- alt -styrene) have low cell toxicity and are effective inhibitors of HIV-1 in a cellular model in vitro.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption Behavior of Hydrophobically Modified Polyelectrolytes onto Amino- or Methyl-Terminated Surfaces

et al. 2011

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The adsorption of hydrophobically modified polyelectrolytes derived from poly(maleic anhydride-alt-styrene) (P(MA-alt-St)) containing in their side chain aryl-alkyl groups onto amino- or methyl-terminated silicon wafers was investigated. The effect of the spacer group, the chemical nature of the side chain, molecular weight of polyelectrolyte, and ionic strength of solution on the polyelectrolyte adsorbed amount was studied by null ellipsometry. The adsorbed amount of polyelectrolyte increased with increasing ionic strength, in agreement with the screening-enhanced adsorption regime, indicating that hydrophobic interactions with the surface play an important role in the adsorption process. At constant ionic strength, the adsorbed amount was slightly higher for polyelectrolytes with larger alkyl side chain and decreased with the hydrophobicity of aryl group. The adsorption behavior is discussed in terms of the side chain flexibility of the polymer. Characteristics of the adsorbed layer were studied by atomic force microscopy (AFM) and contact angle measurements. AFM images show the presence of aggregates and closed globular structure of polyelectrolyte onto the amino- or methyl-terminated surface, which agrees with a 3D and 2D growth mechanism, respectively. Fluorescence measurements showed that the aggregation of polyelectrolyte containing the hydrophobic naphthyl group occurs already in the solution. However, the aggregation of polyelectrolytes containing the phenyl group in its side chain is not observed in solution but is induced by the amino-terminated surface. This difference can be explained in terms of the higher flexibility of side chain bearing the phenyl group. The polyelectrolyte films showed a high chemical heterogeneity and moderate hydrophobicity.

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Section: ' Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Adsorption Behavior of Hydrophobically Modified Polyelectrolytes onto Amino- or Methyl-Terminated Surfaces

et al. 2011

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“…Thus, our results lead us to conclude that for CrðNNÞ 3þ 3 -TX-100 systems, we cannot exclude the formation of premicellar aggregates, with an average number of two surfactant monomers for each metal complex. [43] for the interaction of CrðPh 2 phenÞ 3þ 3 complex with anionic polyelectrolytes. The authors found that the luminescence of this complex decreases in presence of aromatic hydrophobic microdomains formed by cyclohexyl, phenyl, or naphthyl as side chain groups.…”

Section: Luminescence Lifetime Vs Tx-100 Concentration Titration Curvesmentioning

confidence: 99%

“…Among other applications mentioned in this paper, results of this study can be used in the design of luminescent probes for specific microheterogeneous environments. In a recent work[43], the authors suggest that the affinity of the chromium(III) complexes containing a-diimine ligands allow the detection of hydrophobic microdomains arising from the host-guest interaction in membranes, micelles, and amphipathic polyelectrolytes. Hence, it is hoped that our findings will stimulate further research in these areas.…”

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Interaction of α-diimine–chromium(III) complexes with non-ionic surfactant Triton X-100

Bazán

Pagliero

Suárez

et al. 2013

Journal of Colloid and Interface Science

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Nafion/tetraruthenated porphyrin glassy carbon-modified electrode: characterization and voltammetric studies of sulfite oxidation in water–ethanol solutions

Calfumán

Aguirre

Villagra

et al. 2009

J Solid State Electrochem

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In this work, the modification of a glassy carbon electrode with tetraruthenated porphyrins electrostatically assembled onto a Nafion film, previously adsorbed on the electrode surface, is reported. This modified electrode was characterized by scanning electron microscopy–energydispersive X-ray, Raman spectroscopy, UV-Vis spectroelectrochemistry, and cyclic voltammetry. The Nafion film onto the glassy carbon electrode shows a smooth disposition; when the tetraruthenated porphyrin is incorporated on the Nafion film, the complex is adsorbed in a homogeneous way. The modified electrode catalyzes HSO3 − oxidation in water– ethanol solutions and shows an enhanced stability compared with the electrode modified with the dip coating method. Rotating disk electrode experiments showed a kinetic limitation to the electron transfer controlled by charge propagation in the film. I/E curves show a Tafel slope of 120 mV/decade corresponding to a first electron-transfer reaction, depending on the potential, as the determining step. Spectroelectrochemical experiments demonstrated that Ru(II) is the active site for the electrocatalysis.This work was supported by the program “Anillo Bicentenario de Ciencia y Tecnología CONICYT” ACT No. 24. AECID and A/012666707 PCI projects. KC is grateful to CONICYT for the doctoral scholarship

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Detection of hydrophobic microdomains in anionic polyelectrolytes with tris-(4,7-diphenyl-1,10-phenanthroline)3Cr(III)

Cited by 8 publications

References 30 publications

Adsorption Behavior of Hydrophobically Modified Polyelectrolytes onto Amino- or Methyl-Terminated Surfaces

Adsorption Behavior of Hydrophobically Modified Polyelectrolytes onto Amino- or Methyl-Terminated Surfaces

Interaction of α-diimine–chromium(III) complexes with non-ionic surfactant Triton X-100

Nafion/tetraruthenated porphyrin glassy carbon-modified electrode: characterization and voltammetric studies of sulfite oxidation in water–ethanol solutions

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