Luminescence detection polymers

A unique chemiluminescence photon-counting system, designed specifically for measurement of stress-enhanced polymer reactions, was used for the studies described here. This system Includes a miniature tensile stress device, a controlled environment chamber and a luminescence detection system and associated optics Integrated Into a single unit. 

An optical transducer is an attractive option in that selectivity can be enhanced through the use of optical filters to select specific wavelengths. When this is combined with a very specific optical sensing material, e.g. photo-luminescent quenching polymers, the possible limit of detection is extremely impressive (see chapter 23 of reference [5]) and [11]. 

LUMINESCENT INORGANIC POLYMER SENSORS FOR VAPOUR PHASE AND AQUEOUS DETECTION OF TNT... 

In this chapter, spectroscopy is an umbrella term for a variety of complementary methods such as tJV/VIS, IR, luminescence, and NMR, with the object of examining mainly polymer additives in solution after extraction but usually before a chromatographic separation. On-line spectroscopic detection hyphenated to chromatography is dealt with in Chapter 7. 

Jenkins AL, Uy OM, Murray GM. Polymer-based lanthanide luminescent sensor for detection of the hydrolysis product of the nerve agent Soman in water. Anal Chem 1999 71 373-378. 

Temperature-independent recombination processes accompanied by luminescence have been detected not only in vitreous solutions, but also in polymers. For example, luminescence induced by a temperature-independent recombination process in polyethylene has been observed [63]. 

In another approach, a fluorescent conjugated polymer was used as the material for the preparation of a chemosensor to detect 2,4,6-trinitrotoluene (TNT) and its related nitroaromatic compounds. To this end, microparticles, made of three-dimensionally cross-linked poly(l,4-phenylene vinylene) (PPV) via emulsion polymerization, were synthesized [61]. This material was chosen due to its high fluorescence intensity and sensitivity to changes in its microenvironment. The chemosensor was exposed to vapour containing different amounts of TNT and quenching of the polymer luminescence at 560 nm was observed after excitation at 430 nm. The dependence of the fluorescence signal in response to the analyte was described by a modified Stem-Volmer equation that assumes the existence of two different cavity types. The authors proposed the modified Stem-Volmer equation as follows ... 

Palladium(II)- and platinum(II)-containing polymers assembled by diisocyanide ligands are generally not luminescent.37 Because photoinduced labili-zation of the ligand in M C=N—R systems is possible, absence of luminescence can occur when this photochemical process happens, and consequently the light energy is wasted. As a result, luminescence is often not observed at room temperature in solution for such coordination polymers. Occasionally, only weak emissions at low temperature in the solid state can be detected. 

In anticipation of the intrinsic luminescence properties of these polymeric materials incorporating polymetallic CuX substructures, we resynthesized the Cul and CuBr adducts with Et2S under similar reaction conditions to study the luminescence properties of these diethyl sulfide compounds. The presence of CU4I4 cubane clusters in the polymer could be easily detected by the very strong... 

Spectroelectrochemistry, single molecule — (SMS-EC) Detection of electron transfer processes at luminescing single molecules by noting the quenching effects of electron transfer, for example in the oxidation of polymer molecules [i]. 

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