Monodimensional polymer

C6C15) with dimethylsulfoxide (DMSO), which leads to the synthesis of [Tl2 Au(C6F5)2 2 p-DMSO 3] or [Tl2 Au(C6Cl5)2 2 h-DMSO 2]ra, respectively.62 The crystal structure of the complex with fluorine shows a monodimensional polymer formed by repetition of [Au--Tl(p-0 = SMe2)3Tl] units, with gold-thallium interactions of 3.2225(6)-3.5182(8), while the pentachlorophenyl derivative contains two bridging DMSO molecules and an additional [Au(C6Cl5)2] anion. In addition, a thallium-thallium interaction of 3.7562(6) A appears in the latter (Fig. 21). 

Figure 2.36 Molecular structure of [Gd(L )3(H20)]-4H20 co showing 30% ellipsoids with all H atoms and lattice solvent molecules removed [43]. (Reproduced with permission from RC. Andrews, G.B. Deacon, R. Frank, B.H. Fraser, P.C. Junk, et al., Formation of Ho trinuclear clusters and Gd monodimensional polymers induced by ortho and para regioisomers of pyridyl-functionahsed fi-diketones synthesis, structure, and magnetic properties, European Journal of Inorganic Chemistry, 2009, 6, 744-751. Wiley-VCH Verlag GmbH Co. KGaA.)...

Andrews, P.C., Deacon, G.B., Frank, R., et al. (2009) Formation of Ho trinuclear clusters and Gd monodimensional polymers induced by ortho and para regioisomers of pyridyl-functionalised P-diketones synthesis, structure, and magnetic properties. European Journal of Inorganic Chemistry, 744-751. 

Linear (or monodimensional) polymers, which consist of a (possibly) high (but finite) number of monomeric units such systems are obtained by the polymerization of bivalent monomers, and a linear macromolecule can be schematically represented by a continuous line divided into intervals to indicate the monomer units (Figure 1.1) an assembly of polymer chains consists of entities with variable length, a characteristic designated by the term dispersity... 

Here we introduce a personal point of view about the interactions between conducting polymers and electrochemistry their synthesis, electrochemical properties, and electrochemical applications. Conducting polymers are new materials that were developed in the late 1970s as intrinsically electronic conductors at the molecular level. Ideal monodimensional chains of poly acetylene, polypyrrole, polythiophene, etc. can be seen in Fig. 1. One of the most fascinating aspects of these polymeric... 

Figure 1. Some of the more usual chains of conducting polymers (monodimensional, noncross-linked, and nondegraded, i.e., theoretical).

Like for polymer 9, the framework of [Cu2I2 i,-L29 2] 29 (Fig. 43) is monodimensional, but the dithioether ligand L29 assembles dinuclear Cu( i,-I)2Cu motifs (d Cu Cu 3.131(2) A) exclusively through the pyrimidine nitrogen atoms with formation of 16-membered macrocycles. 

Applications of porphyrin-nanotube composites are, by and large, mainly in the photovoltaic [154-156] and optoelectronic [157,158] fields, that are out of the scope of the present chapter. Nevertheless, a number of interesting reactions have been investigated with porphyrin-CNT systems that can be regarded as nanoreactors. Moreover, being monodimensional conducting polymers, they are expected to play a role in different nanotechnology fields [159,160]. 

Hdix bands that disaj ar from the polymer melts and solutions due to the shortening the helix sequences in the amorphous state. These bands are specific for a particular type stereoiegularity and are sensitive to the monodimensional order in a polymer (63). 

For the sake of simplicity, a polymer chain can be visualized as a very long noodle or a worm whose dots would correspond to successive monomeric units (Figure 3.1). The chain drawn in Figure 3.1 consists of two ends and is called linear or monodimensional its molar mass, which is related to its size, has a finite value. All polymers having a finite size irrespective of their topology (or... 

Chains extended under stressed conditions do not exhibit the same attractiveness applicationwise as those oriented monodimensionally (fibers and films) or two-dimensionally (films) stretched. Section 5.5 will be devoted to the description of orientated polymers. 

The average valence of a reaction mixture, v = EiNiVi/ EiNi, determines eventually the dimensionality and thus the structural and physical characteristics of the resulting polycondensate formed. Indeed, if w = 2, the resulting polymer is monodimensional (either linear or branched) whereas if w > 2, it is three-dimensional. 

Although these polymers are mainly utilized as three-dimensional elastomers after vulcanization, they are produced as linear polymers. For this reason they are classified in the category of monodimensional polymeric materials. Indeed, in spite of the presence of two double bonds in the monomer molecules, their polymerization leads to linear chains with preservation of one unsaturation per monomeric unit. 

LINEAR (MONODIMENSIONAL) SYNTHETIC POLYMERS or the oxychloration of ethylene, catalyzed by Q1CI2 2 CuCl + 1/2 O2 CuO, CuCl2... 

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