Mono— -hexagonal lattice

The mono— hexagonal lattices (Cyvin 1992a) are analogous with the hexagonal lattice. Examples for = 5 and = 7 are shown below. 

The introduction of mono- hexagonal lattices makes it feasible to adapt the notions of geometrically planar/nonplanar and nonhelicenic/helicenic systems to mono—(f-polyhexes in general. 

Among MC lattice models of the double layer, it is also worth mentioning the work of Nazmutdinov et al. (1988), who used a lattice model involving two mono-layers of water molecules on the surface of an electrode, forming a hexagonal close-packed array. The interaction of each water molecule in contact with the metal surface (assumed to be Hg) was taken from quantum-mechanical calculations. Information was obtained concerning the relative numbers of molecules with different numbers of hydrogen bonds, and it was concluded that the hypothesis of an icelike state of water in a monolayer on Hg is rather unlikely. 

Ihe "induced hexagonal structure is stable caily in the presence of the included oomapound. Removal of the included partner by extraction or volatilization causes a rapid breaMown of the urea lattice. Aliphatic hydrocarbons, alcohols, ketones, esters, ethers, amines, nitriles, mono- and dicarboj lic acids, and their halogen derivatives can be included in the urea complex. 

The atoms of the rare gases form molecular (saturated) structure with the mono-atomic molecule Only van der Waals interactions occur between the identical atoms, un-oriented, so that their ordering in the network respects the maximum compactness rule. The resulted lattices can be cubically or hexagonally compacted. However, since atoms are placed in the nodes of the network, the rare gases lattice can be called as atomic network or particular case of a molecular network. 

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