Room-temperature phosphorescence of polynuclear aromatic hydrocarbons on matrix-modified solid substrates

Perry, L.M.; Campiglia, Andrés D.; Winefordner, J. D.

doi:10.1021/ac00195a024

Cited by 28 publications

(23 citation statements)

References 20 publications

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“…Analyst, June 1997, Vol. 122 (559-562) Stock standard solutions of 0.5 mol dm 23 Pb(NO 3 ) 2 , 5 mol dm 23 KI, 0.25 mol dm 23 TlNO 3 , 0.5 mol dm 23 AgNO 3 and 0.2 mol dm 23 SDS were prepared in water. Working standard solutions of lower concentrations were obtained by appropriate dilution with water.…”

Section: Methodsmentioning

confidence: 99%

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Phosphorimetric Determination of Indomethacin in Pharmaceutical Formulations

Arruda¹,

Campiglia²

1997

Analyst

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A simple, rapid and sensitive method for the determination of indomethacin was developed based on solid-surface room-temperature phosphorimetry. Phosphorescence emission was induced by the indomethacin hydrolysis reaction in a basic medium. Chromatography paper treated for background reduction was employed as a solid substrate. The use of four heavy-atom salts and sodium dodecyl sulfate was optimized to estimate an absolute limit of detection at the subnanogram level. A calibration curve with a linear dynamic range extending over two orders of magnitude (3.0 x 10(-7)-1.0 x 10(-4) mol dm-3) was obtained. The recovery of the method (98.4 +/- 6.8%) was tested using commercial formulations containing indomethacin as the only anti-inflammatory agent.

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Section: Methodsmentioning

confidence: 99%

“…A stock standard solution of 10 23 mol dm 23 indomethacin was prepared in ethanol-water (1 + 1). Working standard solutions of lower concentrations were obtained by dilution with ethanol-water (1 + 1).…”

Section: Methodsmentioning

confidence: 99%

Phosphorimetric Determination of Indomethacin in Pharmaceutical Formulations

Arruda¹,

Campiglia²

1997

Analyst

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“…The de is very low for silica gel, a surface lacking cations and decreased significantly on Before closing this section we like to point out that RTP has been observed on silica surfaces and papers impregnated with heavy metal salts such as thalium nitrate. [273][274][275][276] Thus the heavy cation and its proximity to the emitter are the key factors that lead to enhancement of phosphorescence and the confined container prevents quenching by oxygen and by itself (self-quenching; see below).…”

Section: Distinct Differences Exist Between the Rigidly Organized Strmentioning

confidence: 99%

Supramolecular photochemistry concepts highlighted with select examples

Ramamurthy

Mondal

2015

Journal of Photochemistry and Photobiology C: Photochemistry Re

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‗Supramolecular Photochemistry' (SP) deals with a study of the properties of molecules in their excited states where the medium plays a significant role. While ‗Molecular Photochemistry' (MP) deals with studies in isotropic solution, the SP deals with reactant molecules that interact weakly with their surroundings. The surroundings in general are highly organized assemblies such as crystals, liquid crystals, micelles, hostguest structures etc. The behavior of exited molecules in SP unlike in isotropic solution is controlled not only by their inherent electronic and steric properties but also by the immediate surroundings. The weak interactions that control the chemistry include van der Walls, hydrophobic, C-H-, - and several types of hydrogen bonds. In this review the uniqueness of SP compared to MP is highlighted with examples chosen from reactions in crystals, micelles and host-guest assemblies. In spite of distinctly different structures (crystals, micelles etc.) the influence of the medium could be understood on the basis of a model developed by G. M. J. Schmidt for photoreactions in crystals. The principles of reaction cavity model are briefly outlined in this review. There are a few important features that are specific to SP. For example, highly reactive molecules and intermediates could be stabilized in a confined environment; they enable phosphorescence to be observed at room temperature and favor chiral induction in photochemical reactions. Using such examples the uniqueness of SP is highlighted. The future of SP depends on developing efficient and unique catalytic photoreactions using easily available reaction ‗containers'. In addition, their value in artificial photosynthesis should be established for SP to occupy a center stage in the future.

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“…[6][7][8][9] The optimum concentration of SDS with KI on the PVA substrate was investigated by monitoring the RTP signal of IM-MMAA as a function of the SDS concentration. The result is shown in Fig.…”

Section: Effects Of Heavy Atoms Surfactant and Spotting Order Of Anmentioning

confidence: 99%