Polydecker sandwich structure

Shur, V. B., Tikhonova, I. A., Yanovsky, A. I., et al, Compounds for anions - unusual complex of trimeric perfluoro-o-phenylenemercury with the bromide anion having a polydecker sandwich structure. J Organomet. Chem. 1991, 418, C29-C32. 

Figure 3. Crystal structure of receptor 36 with bound bromide ions. [Reprinted from J. Organo-mel. Chem.. 418. C29. V. B. Shur, A. Tikhonova. A. I. Yanovsky, Y. T. Struchkov, P. V. Petrovskii, S. Y. Panov. G. G. Furin, and M. H. Vol pin. Crown compounds for anions. Unusual complex of tremeric perfluoro-o-phenylene mercury with the bromide anion having a polydecker sandwich structure C29, 1991, with kind permission of Elsevier Science SA, Lausanne, Switzerland.]...

The reactions of macrocycle 8 with benzene, biphenyl, naphthalene, and triphenylene result in the fo mation of 1 1 complexes with polydecker sandwich structures in the solid state." The bonding of the aromatic molecules to 8 in these unusual complexes is due to secondary n-interactions between the C—C bonds of the arenes and the Lewis acidic Hg centers. Thus, even weak Lewis bases such as aromatic hydrocarbons are able to formhost-guest complexes with 8. 

Figure 11. (a) Structure of a ful-valene-bridged linked-tetradecker oligomer. [12] (b) Structure of a diborolyl-nickel polydecker sandwich. [17]... 

Metal-containing polymers exist in a plethora of wonderful shapes and structures including rods, sheets, and coils. There are a number of interesting structural classes of polymers known as stacked systems. These include both the shish-kebab type and the polydecker sandwich-type structures. A metal phthalocyanine structure with bridging pyrazine units (51) resembles a shish-kebab, in which the metal-pyrazine chain represents the skewer. ... 

Both mercuracarborands 11 and 17 are able to bind halide anions and acetonitrile molecules. In the case of 17, the resulting complexes with halide anions (CP, Br , P) contain two molecules of the macrocycle per one anionic guest and have unique structures of double-decker sandwiches.The halide ion is situated here between two parallel mercuracarbon rings and is symmetrically bonded to six Hg centers. Thus, the coordination number of the halogen atom in these sandwiches as in the above-discussed polydecker bent sandwich complexes of 8 with bromide and iodide anions is equal to six. Structures of the halide adducts formed by macrocycle 11 are not yet determined. 

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