Intermicellar Mobility of Probe and Quencher in Reverse Micelles Studied by Fluorescence Quenching

Gehlen, Marcelo Henrique; Schryver, F. C. De; Dutt, G. B.; Stam, Jan van; Boens, N.; Auweraer, Mark Van der

doi:10.1021/j100039a031

Cited by 17 publications

(20 citation statements)

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“…Most of the data were obtained by interpolating the results in Fig. 2a. more so the higher the temperature and surfactant concentra-allow a rapid intermicellar migration of probe and quencher, is presently being worked out (49,50).…”

Section: Methodsmentioning

confidence: 99%

Aggregation and Microstructure in Aqueous Solutions of the Nonionic Surfactant C12E8

Danino

Talmon

Zana

1997

Journal of Colloid and Interface Science

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Section: Methodsmentioning

confidence: 99%

Aggregation and Microstructure in Aqueous Solutions of the Nonionic Surfactant C12E8

Danino

Talmon

Zana

1997

Journal of Colloid and Interface Science

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“…(10)] are defined as for the previous model (Section 2 B). While sometimes (e.g., for inverse micelles [19,20] or highly hydrophobic quenchers [20][21][22][23][24] ) k e corresponds to a real physical process, in other systems (e.g., for hydrophilic counterions acting as quencher) k e K is rather related to an increase of k À on increasing the overall surfactant concentration and ionic strength. [25][26][27] Under these conditions, k e K should be considered as a first term in a Taylor series expansion of k À as a function of the micelle and surfactant concentrations.…”

Section: B Mobile Quencher and Immobile Probementioning

confidence: 99%

“…This phenomenon is not limited to micelles but also has been observed for inverted micelles. [20,24] The more complex cases in which both probe and quencher migrate [31,32] or the micelles (or inverse micelles) are present as clusters [33,34] are not treated here.…”

Section: Migrating Probementioning

confidence: 99%

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Identifiability of Models for Fluorescence Quenching in Aqueous Micellar Systems

Boens

Auweraer

2005

ChemPhysChem

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The first deterministic identifiability analysis is presented for four commonly used kinetic models of fluorescence quenching of an excited probe in aqueous micelles: A) model with immobile quenchers, B) model with mobile quenchers, C) an extension of model B in which exchange of quenchers both via the aqueous phase and during micelle collisions is taken into account, and D) model with probe migration. It is shown that these specific models for fluorescence decay of an excited probe solubilized in a micelle and quenched by molecules or ions that are Poisson-distributed over the micelles, resulting in the generalized four-parameter equation f(t)=A(1) exp{-A(2)t-A(3)[1-A(4)t]}, are uniquely identifiable in terms of four descriptive A parameters. Moreover, each model also can be uniquely identified in terms of the underlying rate constants and micellar concentration or mean micellar aggregation number. This means that these parameters can be extracted in a unique way from time-resolved fluorescence quenching experiments on a probe in micelles. For each model the recommended analysis approach is given.

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“…If N ag is known, the value of k +Q , the rate constant for entry of the quencher into the micelle, can also be estimated, providing a full characterization of the dynamics of the entry, exit and intra-aggregate diffusion of the quencher (12,(18)(19)(20). In the general case, where both probe and quencher are localized in the aggregate at the moment of excitation but can migrate by entry and exit from the aggregate or by fusion ⁄ fission of the aggregates (12,13,15,(21)(22)(23)(24), the decay of the probe fluorescence should still obey the Infelta-Tachiya equation, but there are no known analytical solutions for <x> S . However, a number of approximations for <x> S have been developed for the limit of small micelle occupation number, i.e.…”

Section: Introductionmentioning

confidence: 99%

Fusion-Fission Transport of Probes and Quenchers in Microdomains of an Amphiphilic Ionene Polyelectrolyte†

Tcacenco¹,

Quina²

2007

Photochemistry and Photobiology

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In aqueous solution, amphiphilic ionenes such as the [3,22]-ionene spontaneously adopt globular conformations and form microdomains that are highly micelle-like, i.e. are capable of solubilizing organic molecules, binding and exchanging counterions and accelerating or inhibiting the rates of bimolecular reactions. Time-resolved fluorescence decay of pyrene and pyrene derivatives solubilized in these microdomains at concentrations where excimer formation occurs show that even water-insoluble probes can migrate between the hydrophobic microdomains formed in aqueous solution by a [3,22]-ionene chloride (with the N-terminal groups quaternized with benzyl chloride). Time-resolved studies of the quenching of pyrene fluorescence by alkylpyridine derivatives revealed similar behavior. The observed quenching behavior requires that the migration be between microdomains on the same ionene chain or same group of associated ionene chains and is consistent with migration dominated by fusion/fission transport of the probe and quencher.

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Intermicellar Mobility of Probe and Quencher in Reverse Micelles Studied by Fluorescence Quenching

Cited by 17 publications

References 0 publications

Aggregation and Microstructure in Aqueous Solutions of the Nonionic Surfactant C12E8

Aggregation and Microstructure in Aqueous Solutions of the Nonionic Surfactant C12E8

Identifiability of Models for Fluorescence Quenching in Aqueous Micellar Systems

Fusion-Fission Transport of Probes and Quenchers in Microdomains of an Amphiphilic Ionene Polyelectrolyte†

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