Reference materials for fluorescence measurement

Eaton, David F.

doi:10.1351/pac198860071107

Cited by 1,223 publications

(906 citation statements)

References 5 publications

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“…Correction of part of the spectrum gave a maximum of 311 nm. Fluorescence quantum yields [48] were determined with naphthalene in cyclohexane (F fl 0.23) as the reference. Solutions were purged with argon for at least ten minutes.…”

Section: Methodsmentioning

confidence: 99%

Electron Delocalization in Cross‐Conjugated p‐Phenylenevinylidene Oligomers

Klokkenburg

Lutz

Spek

et al. 2003

Chemistry A European J

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The synthesis, structure, and electronic properties of a series of crossconjugated p-phenylenevinylidene oligomers with one to four double bonds are reported. The X-ray crystal structure of the compound with two double bonds reveals a nonplanar conformation with torsion angles about the C(phenylene) ± C(vinylidene) and C(phenyl) ± C(vinylidene) formal single bonds of 39.5(2)8 and 30.5(2)8, respectively. Admixture of quinoid character in the ground state is observed. Infrared and Raman spectroscopy do not provide a clear picture of the degree of electron delocalization in the series, since the CC stretching mode does not adequately reflect the CC bond order and has a local nature. In contrast, electronic spectra and electrochemical data, as well as AM1 and PPP/SCF calculations, reveal that the cross-conjugated compounds basically behave as linearly p-conjugated systems in the sense that molecular orbitals are delocalized over the entire structure and systematically change in energy. The electronic interaction between the repeating units is, however, not very strong, which has the consequence that spatial extension of the molecular orbitals does not lead to a red shift of the highest occupied molecular orbital ± lowest unoccupied molecular orbital (HOMO ± LUMO) electronic transition. This is related to the feature that the modest narrowing of the HOMO ± LUMO gap with the chain length is accompanied by a relatively large reduction of electron repulsion. This finding implies that care should be taken in the use of electronic spectra for the evaluation of conjugation phenomena.

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Section: Methodsmentioning

confidence: 99%

Electron Delocalization in Cross‐Conjugated p‐Phenylenevinylidene Oligomers

Klokkenburg

Lutz

Spek

et al. 2003

Chemistry A European J

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“…The subscripts 'x' and 'r' refer to the sample and reference. In the visible region, a methanol solution of cresyl violet perchlorate was used as the reference 17 18 (Φ r = 0.0035). The estimated error for these measurements is ±15%.…”

Section: General Photophysicsmentioning

confidence: 99%

A comparison of sensitized Ln(iii) emission using pyridine- and pyrazine-2,6-dicarboxylates – part II

et al. 2013

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The synthesis, X-ray structures and photophysical properties of several new Ln(III) complexes with the dianion of pyrazine-2,6-dicarboxylic acid (H 2 PYZ) that demonstrate excellent stability and solubility in non-aqueous solution are reported, and compared to structurally analogous complexes derived from pyridine-2,6-dicarboxylic acid (H 2 DPA). The Eu(III) and Yb(III) complexes demonstrate efficient metal centered luminescence in the visible and Near Infra-Red (NIR) regions, respectively. Low temperature (77 K) phosphorescence measurements using the corresponding Gd(III) complex has allowed the photophysical properties of the sensitizer to be rationalized, together with corresponding TD-DFT studies for a model complex. Lastly, we have evaluated the sensitization efficiencies for these complexes, and have undertaken femtosecond transient absorption (TA) measurements in order to evaluate the relative importance of the intersystem crossing and energy transfer processes involved with sensitized Ln(III) emission via the antennae effect.

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“…Moreover, this phenomenon was independent on the initial concentration of A C ( Figure S3). Table 1 lists the quantum yields of A C, relative to quinine sulfate (Φ = 0.55), 15 in various states. The quantum yield of A C was just 0.034 in DMSO, and almost zero in water containing 2.5 mol % DMSO directly after preparation.…”

Section: Resultsmentioning

confidence: 99%

Spontaneous Nanoparticle Formation From a Fluorescent Nucleoside Analogue

Bang¹,

Moon²,

Kim³

2011

Bulletin of the Korean Chemical Society

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A fluorescent nucleoside analogue, A C, featuring two non-complementary nucleobases linked through an ethynyl group, was synthesized. The extended π-conjugation imparts A C with red-shifted absorbance (relative to adenine and cytosine) and pale-blue fluorescence. It spontaneously forms nanoparticles, which exhibit considerably enhanced fluorescence, without the help of any additional stabilizing agent. The DMSO/water ratio was an important factor influencing the construction of the NPs. X-ray crystallography confirmed the structure of A C; dynamic light scattering and scanning electron microscopy confirmed the existence of the nanoparticles.

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Reference materials for fluorescence measurement

Abstract: Abstract

Cited by 1,223 publications

References 5 publications

Electron Delocalization in Cross‐Conjugated p‐Phenylenevinylidene Oligomers

Electron Delocalization in Cross‐Conjugated p‐Phenylenevinylidene Oligomers

A comparison of sensitized Ln(iii) emission using pyridine- and pyrazine-2,6-dicarboxylates – part II

Spontaneous Nanoparticle Formation From a Fluorescent Nucleoside Analogue

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