Photometric Titrations

Eriksen, Stuart P.; Connors, Kenneth A.

doi:10.1002/jps.2600530502

Cited by 4 publications

(4 citation statements)

References 39 publications

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“…Based on the emission data, a Stern-Volmer plot was produced [45] (Figure 6), in which F 0 is the emission intensity of [a] Recorded in CH 2 Cl 2 at RT. [b] Recorded in CH 2 Cl 2 at RT with l excitation = 350.0 nm.…”

Section: Photophysical Propertiesmentioning

confidence: 99%

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Diversity‐Oriented Synthesis of Intensively Blue Emissive 3‐Hydroxyisoquinolines by Sequential Ugi Four‐Component Reaction/Reductive Heck Cyclization

Moni

Denißen

Valentini

et al. 2014

Chemistry A European J

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A convergent approach to highly functionalized 3-hydroxyisoquinolines is reported. The key steps are an Ugi multicomponent reaction and a subsequent intramolecular reductive Heck reaction; these can also be performed as a one-pot procedure. The structures display very interesting properties as blue-fluorescence emitters. Photophysical studies on the absorption and static fluorescence indicate that the substitution pattern on the pyridyl part influences the optical properties only to a minor extent, unless the amide substituent becomes sterically demanding and leads to significant nonradiative deactivation. The donor substitution on the benzo core considerably enhances the fluorescence quantum yields and trimethoxy substitution causes a pronounced redshift of the emission bands. Protonation of the isoquinolyl nitrogen atom causes efficient static quenching of the fluorescence.

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Section: Photophysical Propertiesmentioning

confidence: 99%

“…Based on the emission data, a Stern-Volmer plot was produced [45] (Figure 6), in which F 0 is the emission intensity of [d] Quantum yields were determined with anthracene as a standard in cyclohexane (F f = 0.36). [40,41] [e] Quantum yields were determined with 9,10-diphenylanthracene as a standard in cyclohexane (F f = 1.00).…”

mentioning

confidence: 99%

Diversity‐Oriented Synthesis of Intensively Blue Emissive 3‐Hydroxyisoquinolines by Sequential Ugi Four‐Component Reaction/Reductive Heck Cyclization

Moni

Denißen

Valentini

et al. 2014

Chemistry A European J

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“…Especially for confirming the assumption of a single protonation of indazole 6b , as observed by absorption spectroscopy, the protonation was also monitored and quantified by emission spectroscopy. If both isosbestic points (Figure 1) do not describe the equilibrium between a singly protonated and a non‐protonated species rather a dynamic than a steady state quenching could be expected according to Stern–Volmer treatment 34. Upon addition of aliquots of TFA as a quencher a Stern–Volmer plot was obtained that furnished a linear correlation between F / F 0 and the concentration of TFA, which assumes full dissociation of TFA in dichloromethane (Figure 2).…”

Section: Resultsmentioning

confidence: 99%

Two‐Step Synthesis of Blue Luminescent (Pyrrol‐3‐yl)‐1H‐(aza)indazoles Based on a Three‐Component Coupling–Cyclocondensation Sequence

et al. 2015

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(Pyrrol‐3‐yl)‐1H‐(aza)indazoles can be efficiently prepared by a two‐step process that consists of a consecutive three‐component coupling–cyclocondensation synthesis to give ortho‐halo‐3‐acylpyrrol‐3‐yl‐substituted (hetero)arenes followed by a cyclization–condensation–SNAr sequence. Almost all derivatives display an intense blue emission upon excitation in the near UV with enormous Stokes shifts (6500–8300 cm–1) and considerable high fluorescence quantum yields (Φf = 0.28–0.46). Electronic transitions can be plausibly rationalized by TD‐DFT computations performed on DFT‐optimized geometries. Reversible protonation leads to static fluorescence quenching in narrow pH‐ranges, which qualifies the title compounds as favorable ON/OFF fluorescence switching systems.

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“…Photometric titrations combine the simplicity of titration with the accuracy and specificity of spectroscopy. The principles underlying photometric titrations, instrumentation, applications, advantages, and shortcomings have been reviewed recently by several authors (14)(15)(16). A significant advantage of photometric titration is that it can be applied to the determination of individual compounds in a multicomponent mixture.…”

Section: Resultsmentioning

confidence: 99%

Analysis of Certain Phenothiazines and Their Dosage Forms by Photometric Titration with Ceric Sulfate

Agarwal

Blake

1969

Journal of Pharmaceutical Sciences

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Photometric Titrations

Cited by 4 publications

References 39 publications

Diversity‐Oriented Synthesis of Intensively Blue Emissive 3‐Hydroxyisoquinolines by Sequential Ugi Four‐Component Reaction/Reductive Heck Cyclization

Diversity‐Oriented Synthesis of Intensively Blue Emissive 3‐Hydroxyisoquinolines by Sequential Ugi Four‐Component Reaction/Reductive Heck Cyclization

Two‐Step Synthesis of Blue Luminescent (Pyrrol‐3‐yl)‐1H‐(aza)indazoles Based on a Three‐Component Coupling–Cyclocondensation Sequence

Analysis of Certain Phenothiazines and Their Dosage Forms by Photometric Titration with Ceric Sulfate

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