Investigations of energy transfer from some diolefinic laser dyes to Rhodamine 110

Azim, Saleh A.; Ghazy, R.; Shaheen, Mohamed E.; El-Mekawey, F.

doi:10.1016/s1010-6030(00)00231-8

Cited by 28 publications

(16 citation statements)

References 9 publications

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“…It points to the absence of any detectable groundstate complex of the donor-acceptor pair in the solution [29][30][31]. The fluorescence emission spectrum of the mixture of donor and acceptor did not show any additional new broad peak at longer wavelengths which is an evidence of the absence of exciplex formation between the excited donor and the acceptor molecules.…”

Section: Fluorescence (Förster's) Resonance Energy Transfer From Hmmcmentioning

confidence: 78%

“…The fluorescence emission spectrum of the mixture of donor and acceptor did not show any additional new broad peak at longer wavelengths which is an evidence of the absence of exciplex formation between the excited donor and the acceptor molecules. Thus, the decrease in fluorescence intensity of the donor with increasing acceptor concentration indicates non-radiative energy transfer between the excited donor and the acceptor [30,31]. Furthermore, the fluorescence excitation profile monitoring at 455 nm (emission maximum in the presence of donor and acceptor molecules) shows that besides the S 0 -S 1 transition of AODIQ (l max $420 nm), a prominent band with l max $320 nm corresponding to the HMMC absorption occurs (Fig.…”

Section: Fluorescence (Förster's) Resonance Energy Transfer From Hmmcmentioning

confidence: 95%

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7-Hydroxy-4-methyl-8-(4′-methylpiperazine-1′-yl)methyl coumarin: An efficient probe for fluorescence resonance energy transfer to a bioactive indoloquinolizine system

Mallick

Haldar

Sengupta

et al. 2006

Journal of Luminescence

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Section: Fluorescence (Förster's) Resonance Energy Transfer From Hmmcmentioning

confidence: 78%

Section: Fluorescence (Förster's) Resonance Energy Transfer From Hmmcmentioning

confidence: 95%

7-Hydroxy-4-methyl-8-(4′-methylpiperazine-1′-yl)methyl coumarin: An efficient probe for fluorescence resonance energy transfer to a bioactive indoloquinolizine system

Mallick

Haldar

Sengupta

et al. 2006

Journal of Luminescence

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“…Furthermore, the fluorescence spectrum of the mixture of donor and acceptor did not show any additional new band other than the individual emission bands of the two components. These factors taken together negate the formation of any permanent ground-state complex between the donor-acceptor pair in the solution [25][26][27] as well as the formation of exciplex between the excited donor and the unexcited acceptor molecules. Thus the decrease in the fluorescence intensity of the donor with increasing acceptor concentration indicates a non-radiative energy transfer between the excited donor and the unexcited acceptor.…”

Section: Resultsmentioning

confidence: 99%

“…Thus the decrease in the fluorescence intensity of the donor with increasing acceptor concentration indicates a non-radiative energy transfer between the excited donor and the unexcited acceptor. 26,27 Furthermore, the excitation profile monitoring the emission of AODIQ (at 488 nm) shows that in the presence of HSA, besides the S 0 → S 1 transition of AODIQ (λ exc max ≈ 420 nm), a band with λ exc max ≈ 280 nm (corresponding to the tryptophan) appears. This provides strong evidence for the occurrence of Förster-type resonance energy transfer from the tryptophan moiety (donor) present in HSA to the AODIQ molecule (acceptor).…”

Section: Resultsmentioning

confidence: 99%

Fluorescence resonance energy transfer from tryptophan in human serum albumin to a bioactive indoloquinolizine system

et al. 2007

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The interaction between a bioactive molecule, 3-acetyl-4-oxo-6,7-dihydro-12H indolo-[2,3-a] quinolizine (AODIQ), with human serum albumin (HSA) has been studied using steady-state absorption and fluorescence techniques. A 1 : 1 complex formation has been established and the binding constant (K) and free energy change for the process have been reported. The AODIQ-HSA complex results in fluorescence resonance energy transfer (FRET) from the tryptophan moiety of HSA to the probe. The critical energy-transfer distance (R 0 ) for FRET and the Stern-Volmer constant (K sv ) for the fluorescence quenching of the donor in the presence of the acceptor have been determined. Importantly, K SV has been shown to be equal to the binding constant itself, implying that the fluorescence quenching arises only from the FRET process. The study suggests that the donor and the acceptor are bound to the same protein at different locations but within the quenching distance.

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“…It is important to note that additional bands besides absorption bands of DiOC 18 and DiI were not recorded in absorption spectra of the dye mixture. This precluded formation of donor-acceptor complexes in the ground state [15][16][17]. Additional long-wavelength bands were not recorded also in luminescence spectra of the dye mixture in SDS micelles.…”

mentioning

confidence: 99%

Hydrophobicity effect on interactions between organic molecules in nanocages of surfactant micelle

et al. 2008

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fluorophors has been analyzed. It has been shown that hydrophobic interactions in addition to electrostatic interactions are of key importance for the binding between the positively charged dyes and negatively charged surfactant micelles.Introduction. The rapid development of biological research that has been observed in the last decades especially after the emergence of advanced methods such as single-molecule spectroscopy has made completely new demands on fluorescent probes and markers that are used in fluorescent research methods. Then, the development of materials science areas such as nanotechnology has provided very promising new materials that can be used as nanoprobes for investigations at the cellular level and nanocages for selective transport of various substances. Such materials include semiconducting quantum dots [1, 2], fluorescent polymeric dots [3,4], fluorescent polymeric spheres [5], and hollow nanoparticles based on cross-linked block copolymers [6][7][8]. Ultramicroheterogeneous systems, for example, micelles of colloidal surfactants (SA) and microemulsions are also of definite interest because they are widely used in various branches of science and technology including for the synthesis of nanoparticles of various structure as unique nanoreactors. The search for methods of manipulating samples in a nano-scale volume is especially interesting from the viewpoint of nanotechnology development.Herein we present results from investigations of the interactions of organic fluorophors solubilized in the nano-scale volume of SA micelles. Solubilization of the fluorophors by the SA micelle was monitored by Forster resonance energy transfer (FRET) between a pair of fluorophors (donor and acceptor of electronic excitation energy). The fluorophors were the polymethine dyes DiI and DiOC 18 :

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Investigations of energy transfer from some diolefinic laser dyes to Rhodamine 110

Cited by 28 publications

References 9 publications

7-Hydroxy-4-methyl-8-(4′-methylpiperazine-1′-yl)methyl coumarin: An efficient probe for fluorescence resonance energy transfer to a bioactive indoloquinolizine system

7-Hydroxy-4-methyl-8-(4′-methylpiperazine-1′-yl)methyl coumarin: An efficient probe for fluorescence resonance energy transfer to a bioactive indoloquinolizine system

Fluorescence resonance energy transfer from tryptophan in human serum albumin to a bioactive indoloquinolizine system

Hydrophobicity effect on interactions between organic molecules in nanocages of surfactant micelle

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