Teflon porphyrin

The interesting dual behaviour of porphyrin derivatives is demonstrated by intramolecular electron transfer between an electron-rich tris(4-methylphenyl)porphyrin zinc complex (ZnTPP) and an electron-deficient tris(4-methylphenyl)octafluoroporphyrin (TPOFP) (Teflon porphyrin) free base connected via an azobenzene moiety (438 Scheme 6.209).1250 Upon photolysis at >440 nm, E —> Z photoisomerization (Section 6.4.1) occurs. (Z)-438 can revert to ( )-438 only thermally, because the excited state of the Z-isomer is efficiently quenched by intramolecular electron transfer from ZnTPP to TPOFP, whereas no such interaction is possible in the -isomer because the chromophores are too remote. This approach has been suggested for photocontrolled molecular electronics. 

Fig.26 Pseudo-color time-resolved image of polystyrene nanobeads containing Pt porphyrin and conjugated to streptavidin immobilized to a biotinylated microarray surface (black teflon coated 96-well glass slide, spot diameter 1 mm, Erie Scientific) in different concentrations (25, 15, 10, 5, Ong streptavidin per well) [167]...

Casting the complex solution of a metalloporphyrin and a polymer ligand such as poly(vinylimidazole-co-alkylmethacrylate) (Olm in Fig. 9-8), for example, on a Teflon plate and drying, yielded both a homogenously dispersed metalloporphyrin in a solid state and a mechanically tough membrane [26]. The Tg of the membrane was increased, for example, from -1 °C for the Olm itself to 6 °C and the membrane became brittle after the incorporation of 40 wt.% cobalt porphyrin this was explained by the stiffening effect of the incorporated... 

Carbon fiber-based sensors are too fragile to be used in deep-tissue measurements. However, these sensors can be protected by insertion into an intravenous catheter, which can be implanted in tissues or blood vessels. To make the catheter-protected sensor, a bundle of (5-7) carbon fibers are mounted inside a truncated needle (Fig. 9). After curing, the shaft of the truncated needle is coated with a nonconducting epoxy. Then, conductive porphyrinic film and Nafion are deposited on the protruding carbon fiber. A puncture needle is used to place a Teflon catheter with a perforated tip deep inside the tissue of a blood vessel. The Teflon catheter s position is secured and the puncture needle is removed. Then, an NO sensor mounted at the end of a truncated needle shaft is inserted into the hollow Teflon catheter. The... 

Chloroform solutions (30 mL) of the copolymer (0.28 g) and the cobalt-porphyrin (0.12 g) were carefully cast on a Teflon plate (8X8 cm) under an oxygen-free atmosphere for 1 day, followed by drying in a vacuum, to yield a transparent, homogeneously red, flexible membrane, with a thickness of about 60 jL,m. 

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