Zigzag chains polymer

Zigzag chain polymers are also characteristic of the solid-state structures of 7.103b, g, m, n, o (Ln = Y, Sm, Er, Tm, Yb) [89]. Because of the smaller ionic radii of the lanthanide ions the formal coordination number is reduced to ten. Once... 

Zirconium tetrachloride is a tetrahedral monomer in the gas phase, but the soHd is a polymer of ZrCl octahedra arranged in zigzag chains in such a way that each zirconium has two pairs of bridging chlorine anions and two terminal or t-chlorine anions. The octahedra are distorted with unequal Zr—Cl bridge bonds of 0.2498 and 0.2655 nm. The physical properties of zirconium tetrachloride are given in Table 7. 

The use of rotated Fischer projections corresponds to the practice of using horizontal lines to denote polymer backbone bonds, but it is most important to note that this does not give an immediately visual impression of the zigzag chain. In the projections as used in this document, at each individual backbone carbon atom the horizontal lines represent bonds directed below the plane of the paper from the carbon atom while the vertical lines project above the plane of the paper from the carbon atom. Thus, the rotated Fiseher projection... 

Figure 9.1 Schematic representation of some of the simple network architectures structurally characterised for metal-organic polymers (a) 2D honeycomb, (b) ID ladder, (c) 3D octahedral, (d) 3D hexagonal diamondoid, (e) 2D square grid, and (f) ID zigzag chain (reprinted from Section Key Reference The American Chemical Society).

Matouzenko, G. S., Perrin, M., Le Guennic, B., et al., Spin crossover behavior in a family of iron(II) zigzag chain coordination polymers. Dalton Trans. 2007, 934-942. 

FIGURE 2.40 Zigzag pattern of a chain polymer molecule. 

---