Photoinduced energy and electron transfer in micellar solutions of methylene blue

1988 ◽  
Vol 53 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Viktor Řehák ◽  
Yvona Rybová
Keyword(s):  
Methylene Blue ◽  
Electron Transfer ◽  
Energy Transfer ◽  
Ethylenediaminetetraacetic Acid ◽  
Sodium Dodecyl ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Quenching Rate ◽  
Pyrene Fluorescence ◽  
Energy And Electron Transfer

In the micellar medium of sodium dodecyl sulphate the monomer-dimer equilibrium of methylene blue is shifted markedly in favour of the monomer. Methylene blue quenches the fluorescence of pyrene solvated in micelles, which is explained in terms of resonance energy transfer. Based on the theoretical model, the pyrene fluorescence quenching constant in the micelles was determined (kqm = 1.8 106 s-1) and the average pyrene-methylene blue interaction distance for the singlet-singlet energy transfer estimated. The T1 → Tn absorption of methylene blue is quenched by pyrene and tetrasodium salt of ethylenediaminetetraacetic acid (EDTA); the quenching rate constants corresponding to the electron transfer are 5 106 and 2.05 108 1 mol-1 s-1, respectively.

Electrochemiluminescence resonance energy transfer between methylene blue and Ru(bpy)32+-doped silica nanoparticles and its application in the “turn-on” detection of glucose

2019 ◽  
Vol 43 (23) ◽  
pp. 9226-9231
Author(s):  
Yuling Fu ◽  
Wenjing Qi ◽  
Hongkun He ◽  
Maoyu Zhao ◽  
Di Wu ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Energy Transfer ◽  
Silica Nanoparticles ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Turn On

The ECL donor Ru(bpy)32+-doped silica nanoparticles and acceptor methylene blue were applied in the electrochemiluminescence resonance energy transfer-based detection of glucose.

Resonance energy transfer study of laser dyes LD 489 and LD 473 with rhodamine 6G

2014 ◽  
Vol 92 (4) ◽  
pp. 302-306 ◽  
Author(s):  
H.R. Deepa ◽  
J. Thipperudrappa ◽  
H.M. Suresh Kumar
Keyword(s):  
Energy Transfer ◽  
Rhodamine 6G ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Laser Dyes ◽  
Rate Parameter ◽  
Quenching Rate ◽  
Range Interaction ◽  
Time Resolved ◽  
Bimolecular Quenching

The energy transfer using two laser dyes 6,7,8,9-tetrahydro-6,8,9-trimethyl-4-(trifluoromethyl)-2H-pyrano[2,3-b][1,8]naphthyridin-2-one (LD-489) and 1,2,3,8-tetrahydro-1,2,3,3,8-pentamethyl-5-(trifluoromethyl)-7H-pyrrolo[3,2-g]quinolin-7-one (LD-473) as donors and rhodamine 6G (Rh6G) as acceptor was investigated in methanol using steady state and time resolved fluorescence spectroscopy. The bimolecular quenching rate parameter, kq, and the translation diffusion rate parameter, kd, were calculated and these values indicated that the diffusion process alone does not operate in energy transfer process. The mean diffusion length, d1, is found to be less than the Förster distance, R0, supporting the dominance of long-range interaction. The critical transfer distances determined from both the Förster equation and the half quenching concentration are close to one another, revealing that the Förster mechanism plays an important role in overall energy transfer of the donors.

scholarly journals Nanoparticles as energy donors and acceptors in bionanohybrid systems

2019 ◽  
Author(s):  
Jakub Sławski ◽  
Joanna Grzyb
Keyword(s):  
Electron Transfer ◽  
Energy Transfer ◽  
Nucleic Acid ◽  
Organic Molecule ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Redox Active ◽  
Partner Interaction ◽  
Working Out ◽  
Different Origin

The bionanohybrids are the junctions of at least two objects of different origin: abiotic and biotic. The abiotic part is a nanoparticle (often a fluorescent quantum dot), the biotical one may be a protein (especially fluorescent one or redox-active one), nucleic acid, carbohydrate as well as a simple organic molecule. When such a junction undergoes illumination, the energy transfer between the partners is possible. The nanoparticles, depending on their characteristics, may be donors, acceptors or mediators of the energy transfer. In most cases, the mechanism of the transfer is the Förster resonance energy transfer (FRET) or the electron transfer (ET). Here, we reviewed the newest achievements in the field with special attention paid to those bionanohybrids which allow FRET or ET. Such nanohybrids are important not only for exploration of the mechanism of the partner interaction but mainly for working out nanobiodevices for biosensing and nanotools for modern therapies.

scholarly journals Design of metalloporphyrin-based dendritic nanoprobes for two-photon microscopy of oxygen

2008 ◽  
Vol 12 (12) ◽  
pp. 1261-1269 ◽  
Author(s):  
Artem Y. Lebedev ◽  
Thomas Troxler ◽  
Sergei A. Vinogradov
Keyword(s):  
Electron Transfer ◽  
Energy Transfer ◽  
Dynamic Range ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Triplet States ◽  
Redox Potentials ◽  
Oxygen Quenching ◽  
Two Photon Microscopy ◽  
Two Photon

Metalloporphyrin-based phosphorescent nanoprobes are being developed for two-photon microscopy of oxygen. In these molecular constructs, the generation of porphyrin triplet states following two-photon excitation is induced by the intramolecular Förster-type resonance energy transfer from a covalently attached 2P antenna. In the earlier developed prototypes, electron transfer between the antenna and the metalloporphyrin strongly interferred with the phosphorescence, reducing the sensitivity and the dynamic range of the sensors. By tuning the distances between the antenna and the core, and adjusting their redox potentials, the unwanted electron transfer could be prevented. An array of phosphorescent Pt porphyrins (energy transfer acceptors) and 2P dyes (energy transfer donors) was screened using dynamic quenching of phosphorescence, and the FRET-pair with the minimal ET rate was identified. This pair, consisting of Coumarin-343 and Pt meso-tetra-(4-alkoxyphenyl)porphyrin, was used to construct a probe in which the antenna fragments were linked to the termini of G3 poly(arylglycine) (AG) dendrimer with PtP core. The folded dendrimer formed an insulating layer between the porphyrin and the antenna, simultaneously controlling the rate of oxygen quenching (Stern-Volmer oxygen quenching constant). Modification of the dendrimer periphery with oligoethyleneglycol residues made the probe's signal insensitive to the presence of proteins and other macromolecular solutes.

A novel dual-switch fluorescent probe for Cr(iii) ion based on PET–FRET processes

The Analyst ◽  
2014 ◽  
Vol 139 (14) ◽  
pp. 3607-3613 ◽  
Author(s):  
Fangzhi Hu ◽  
Baozhan Zheng ◽  
Dongmei Wang ◽  
Maoping Liu ◽  
Juan Du ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Energy Transfer ◽  
Fluorescent Probe ◽  
Fluorescence Resonance Energy Transfer ◽  
Photoinduced Electron Transfer ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Sensing System ◽  
System P ◽  
Fluorescence Resonance

Two different strategies for photoinduced electron transfer (PET) and fluorescence resonance energy transfer (FRET) have been designed and combined into one sensing system.

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