Other Electroactive Units

Dendrimer 67 contains two naphthalene diimide electroactive units in the core [137]. Electrochemical investigation in DMF showed the presence of two reversible bielectronic reduction processes at the potential typically featured by other naphthalene diimide-containing compounds. Thus, the two units behave independently and can be readily accessed from the electrode surface. The lack of encapsulating... 

Pihlar and Kosta [3] have developed a continuous distillation system for the amperometric determination of cyanide In water with the aim of avoiding interference from other electroactive species. The configuration is depicted in Fig. 4.7. A peristaltic pump sets the flow of sample, which Is continuously aspirated, and that of the different reagents, in addition to regulating the two outgoing streams of the system. The sample, acidulated with a phosphoric acid stream, is introduced Into the distillation unit, also shown in Fig. 4.7. Its... 

From the viewpoint of chemistry, the molecular building blocks with photoactive or electroactive units are considered first. In other words, supramolecular species are characterized by the ordered arrangement of their components, such as semiconductor clusters, nanocrystals, and quantum dots, as well as aromatic-type organic molecules, coordination compounds, oligomers, and polymers by the nature of the intermolecular noncovalent interactions that hold these components together on nanoscales to form spontaneously organized supramolecular assemblies. 

Strictly speaking, p is the oxidation capacity. The reduction capacity similarly defined is equal but opposite in sign to p). The units of p are, therefore, eq/L volt. In well-poised systems when oxidized and reduced species are electroactive at the electrode surface and both exceed roughly 10 to 10 M, Eh measurements are relatively easy and reproducible. Concentrations as low as 10 M can provide stable Eh readings in pure Fe(II)/Fe(OH)3(s) and Fe(lI)/Fe(IIl) systems (Macalady et al. 1990). On the other hand, in dilute and/or poorly poised waters. Eh measurements may drift without stabilizing for hours. 

The singular porosity of MOFs allows for a significant redox conductivity that, in contrast with zeolites and other microporous aluminosilicates, can involve all units of the material. This is the case of Cu-- and ZrF -based MOFs with terephtalic acid in these materials, both metal centers and organic units are potentially electroactive in contact with suitable electrolytes. 

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