Exploring the extent of magnetic field effect on intermolecular photoinduced electron transfer in different organized assemblies.

The journal of physical chemistry. A · 2005 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 3583

Study snapshot

PublicationThe journal of physical chemistry. A · 2005

Study typein_vitro

Reported directionUnclear

Evidence ratingInsufficient

Abstract

Magnetic field effect (MFE) on the photoinduced electron transfer (PET) between phenazine (PZ) and the amines, N,N-dimethylaniline , N,N-diethylaniline, 4,4'-bis(dimethylamino)diphenylmethane (DMDPM), and triethylamine, has been studied in micelles, reverse micelles, and small unilamellar vesicles (SUVs) with a view to understand the effect of spatial location of the donor and acceptor moieties on the magnetic field behavior. The structure of the assembly is found to influence greatly the PET dynamics and hence the MFE of all the systems studied. The magnetic field behavior in micelles is consistent with the hyperfine mechanism, but high B(1/2) values have been obtained which have been ascribed to hopping and lifetime broadening. The variation of MFE with W(0), in reverse micelles, proves yet again that the MFE maximizes at an optimum separation distance between the acceptor and donor. This is the first example of such behavior for intermolecular PET in heterogeneous medium. We have also reported for the first time MFE on intermolecular PET in SUVs. In this case, the PZ-DMDPM system responds most appreciably to an external field compared to the other acceptor-donor systems because it is appropriately positioned in the bilayer. The differential behavior of the amines has been discussed in terms of their confinement in different zones of the organized assemblies depending on their bulk, hydrophobic, and electrostatic effects.

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AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typein_vitro

Effect directionunclear

PopulationNot supplied

Sample sizeNot supplied

ExposureNot supplied

Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

Magnetic field effects on intermolecular photoinduced electron transfer were observed and depended strongly on the type/structure of organized assembly (micelles, reverse micelles, SUVs) and donor–acceptor spatial positioning. In micelles, the magnetic field behavior was reported as consistent with a hyperfine mechanism, with high B(1/2) values attributed to hopping and lifetime broadening. In reverse micelles, MFE varied with W0 and was reported to maximize at an optimum donor–acceptor separation; in SUVs, the PZ–DMDPM pair showed the most appreciable response, attributed to its positioning in the bilayer.

Outcomes measured

Magnetic field effect (MFE) on photoinduced electron transfer (PET) dynamics between phenazine and various amines in organized assemblies (micelles, reverse micelles, SUVs)
Dependence of MFE on assembly structure and donor–acceptor spatial separation
B(1/2) values and inferred mechanisms (hyperfine mechanism; hopping and lifetime broadening)

Limitations

Magnetic field parameters (field strength range, static vs time-varying, exposure duration) not specified in the abstract
No quantitative effect sizes or statistical details provided in the abstract
In vitro/physicochemical system; no health outcomes assessed

View raw extracted JSON

{
  "study_type": "in_vitro",
  "exposure": {
    "band": null,
    "source": "external magnetic field",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Magnetic field effect (MFE) on photoinduced electron transfer (PET) dynamics between phenazine and various amines in organized assemblies (micelles, reverse micelles, SUVs)",
    "Dependence of MFE on assembly structure and donor–acceptor spatial separation",
    "B(1/2) values and inferred mechanisms (hyperfine mechanism; hopping and lifetime broadening)"
  ],
  "main_findings": "Magnetic field effects on intermolecular photoinduced electron transfer were observed and depended strongly on the type/structure of organized assembly (micelles, reverse micelles, SUVs) and donor–acceptor spatial positioning. In micelles, the magnetic field behavior was reported as consistent with a hyperfine mechanism, with high B(1/2) values attributed to hopping and lifetime broadening. In reverse micelles, MFE varied with W0 and was reported to maximize at an optimum donor–acceptor separation; in SUVs, the PZ–DMDPM pair showed the most appreciable response, attributed to its positioning in the bilayer.",
  "effect_direction": "unclear",
  "limitations": [
    "Magnetic field parameters (field strength range, static vs time-varying, exposure duration) not specified in the abstract",
    "No quantitative effect sizes or statistical details provided in the abstract",
    "In vitro/physicochemical system; no health outcomes assessed"
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "magnetic field effect",
    "photoinduced electron transfer",
    "phenazine",
    "amines",
    "micelles",
    "reverse micelles",
    "small unilamellar vesicles",
    "hyperfine mechanism",
    "B(1/2)",
    "donor-acceptor separation",
    "organized assemblies"
  ],
  "suggested_hubs": []
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1021/jp053222y
PubMed: 16834197

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