Coordination polymers design factors

For any specific BW application, the boiler design, pressure-temperature, operation, and heat-flux rate are all contributing factors these chemistries generally function at substoichiometric levels (the coordinating and complexing polycarboxylic component of polymers aside), so that the use of reliable, directly measurable relationships is not always possible. Nevertheless, some rules and recommendations do exist, a few of which are discussed later. 

The strategy used to design active and selective catalysts was based on the following five factors for regulation, (i) conformation of ligands coordinated to Rh atom (ii) orientation of a vacant site on Rh (iii) cavity with the template molecular shape for reaction space produced behind template removal (iv) architecture of the cavity wall and (v) micropore in inorganic polymer-matrix overlayers stabilizing the active species at the surface [46, 47, 71]. 

In conclusion, with this synthetic approach a wide range of redox-active polymers can be obtained where factors such as the nature of the polymer backbone (e.g use of copolymers), the loading of the metal center, and the nature and coordination sphere of the metal center can be controlled systematically. This has been used to great effect in the design of electrochemically driven chemical and biochemical sensors. 

In this way, rate constants for coordination polymerization depend not only on the monomer type but also on the nature of the active sites present during polymerization. Since the nature of the active sites is a rather complex (and unfortunately poorly understood) function of polymerization conditions such as temperature, catalyst/cocatalyst ratio and type, presence and concentration of catalyst modifiers, and solvent type, among other factors, this makes the determination of general tables of polymerization rate constants and activation energies for coordination polymerization virtually impossible. On the other hand, the same phenomena, that is to say those that make it difficult to predict the behavior of coordination polymerization a priori, are also responsible for the remarkable flexibility of coordination catalysts, since polymers with completely different properties can be made with only a few monomer types by simply varying the way these monomers are inserted into the polymer chain via active-site design. 

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