Organic polymers, magnetic properties

Muller, K., Kothe, G., and Wassmer, K.-H. Dynamic Magnetic Resonance of Liquid crystal Polymers Molecular Organization and Macroscopic Properties. Vol. 95, pp. 1 — 56. 

As this field continues to develop, look for improvements not only in the magnetic properties of these organic polymers, bnt also in the theoretical descriptions of intrinsic ferro- and ferrimagnetism in polymers. 

Polyoxometalates are important catalysts but they are also finding application in optical, electrical, and magnetic devices. Mixed-metal polyoxometalates with vanadium(V) in the polyoxoanion core confers enhanced properties to such structures, principally in their ability to form essentially infinite networks that can be utilized as coatings or as other thin film materials. Additionally, these materials have tunable electromagnetic and photochromic properties. In combination with organic polymers, so-called hybrid polymers, special electrochemical properties are conferred, making possible such electrical storage devices such as capacitors and batteries that utilize the redox properties of the polyoxometalate [7],... 

In most fluorides with organic nitrogen bases, these are protonated and enter the stmcture as counter cations. However, the example of 4,4 -bipyMnF3 (bipy = bipyridine) shows that it is also possible to consfruct hybrid coordination polymers with the amine and fluoride as bridging ligands (Figure 40). The stmcture is modulated at low temperature and has ID magnetic properties ... 

It is reasonable to expect that both the thermal stability and magnetic ordering temperatures in hybrid systems may be improved by synthesizing materials with extended M-O-M arrays. In other words, as the connectivity between transition metals through oxygen increases, hybrid metal oxides should assume properties closer to transition metal oxides and further from purely organic polymers. In this section, we focus exclusively on transition metal systems, since their parent oxides have the most exciting properties [139]. 

Organic polymers that possess the electronic, magnetic, and optical properties of metals are known as conductive polymers (CPs). Because of their conjugated u electron backbones, they can be oxidized or reduced more easily and more reversibly than conventional polymers with charge-transfer agents, also commonly called dopants, a term borrowed from condensed matter physics. While retaining some of the mechanical properties of polymers, they do not melt or dissolve in common organic solvents, a major impediment to their widespread commercialization in the same manner as traditional plastics. The same electronic structure that confers electrical conductivity to these polymers also contributes to their intractability and instability. 

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