1,3,6,8-Tetraethynylpyrene and 1,3,6,8-tetrakis (trimethylsilylethynyl) pyrene: Photophysical properties in homogeneous media

Thirunavukkuarasu, Shyamala; Sankararaman, S.; Mishra, Ashok Kumar

doi:10.1016/j.chemphys.2006.09.018

Cited by 22 publications

(19 citation statements)

References 30 publications

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“…The Lippert-Mataga equation [29][30][31][32] shows that the solvent dependence of the Stokes' shift for a compound depends on the change in the dipole moment of the fluorescence moiety upon excitation, the dielectric constant, and the refractive index of the solvents being used [29][30][31][32][33][34][35]:…”

Section: Resultsmentioning

confidence: 99%

Synchronous fluorescence spectroscopic study of solvatochromic curcumin dye

Patra¹,

Barakat²

2011

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

172

105

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Section: Resultsmentioning

confidence: 99%

Synchronous fluorescence spectroscopic study of solvatochromic curcumin dye

Patra¹,

Barakat²

2011

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

172

105

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“…Pyrenes belong to the polycyclic aromatic hydrocarbons (PAHs) class of compounds and have several appealing photophysical properties that make them suitable for use as effective fluorescence probes. [1–4] One of those properties is the sensitivity of their spectral parameters, such as changes in their vibronic structures (especially the intensity ratios of the first and third vibronic bands) as a result of changes in the environment 5. The effects of temperature and solute–solvent interactions on the various vibronic fine structures in the emission spectra of the pyrene class of compounds have been well explored,2, 6, 7 and these studies revealed the differential perturbation of the individual vibronic bands.…”

Section: Introductionmentioning

confidence: 99%

A Potential Carcinogenic Pyrene Derivative under Förster Resonance Energy Transfer to Various Energy Acceptors in Nanoscopic Environments

2013

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Picosecond-resolved Förster resonance energy transfer (FRET) from various vibronic bands in benzo[a]pyrene (BP) shows a strong dependency on the spectral overlap of an energy acceptor in a confined environment. Our study on the dipolar interactions between BP and different acceptors, including ethidium (Et), acridine orange (AO), and crystal violet (CV), at the surface of a model anionic micelle revealed that the Förster distance (R0) and the rate of energy transfer is dependent on the individual spectral overlap of the vibronic bands of BP with the absorption spectra of the different energy acceptors. The differential behavior of the vibronic bands is compared with that of different dyes [quantum dots (QDs)] in a "dye-blend" (mixture) under FRET to an energy acceptor. Comparison of the FRET of the QDs with that of BP confirmed the independent nature of the dipolar interaction of the vibronic bands with other organic molecules, and the use of deconvolution techniques in the interpretation of the donor-acceptor (D-A) distance was also justified. We also showed that the consideration of differential FRET from the vibronic bands of BP and from the QDs in the dye-blend is equally acceptable in theoretical frameworks including the Infelta-Tachiya model and D-A distribution analysis in nanoenvironments.

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“…c Quantum yields measured in degassed CH 2 Cl 2 solution with excitation at 370 nm (absolute method). Deactivation rate constants were calculated by K r = ϕ em /τ and K nr = ((1/τ) − K r ) 17.…”

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confidence: 99%

Tetra-Au(I) Complexes Bearing a Pyrene Tetraalkynyl Connector Behave as Fluorescence Torches

et al. 2018

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A pyrene tetraalkynyl ligand has been used for the preparation of three different tetraalkynyl Au(I) complexes. Two of these complexes display fluorescent emission in CH 2 Cl 2 solution, with quantum yields exceeding 90%. Although the emission is mainly due to ligand-centered excited states, the presence of the metal center is key to reaching such excellent quantum yield values, providing an extra rigidity to the system and therefore, minimizing the nonradiative deactivation pathways. To the best of our knowledge, these quantum yields lie among the highest reported for metal-based luminophores in solution, a quality that makes them resemble molecular torches. Preliminary studies on healthy cheek cells show that one of the complexes is efficiently and rapidly taken up into the cell.

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1,3,6,8-Tetraethynylpyrene and 1,3,6,8-tetrakis (trimethylsilylethynyl) pyrene: Photophysical properties in homogeneous media

Cited by 22 publications

References 30 publications

Synchronous fluorescence spectroscopic study of solvatochromic curcumin dye

Synchronous fluorescence spectroscopic study of solvatochromic curcumin dye

A Potential Carcinogenic Pyrene Derivative under Förster Resonance Energy Transfer to Various Energy Acceptors in Nanoscopic Environments

Tetra-Au(I) Complexes Bearing a Pyrene Tetraalkynyl Connector Behave as Fluorescence Torches

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