12] Styrenes lac were prepared according to J. A. Donnelly, J. G. Hoey. S. O'Brien.

An astonishing amount of methane is reversibly adsorbed in pores of [{CuSiF6(4,4′‐bipyridine)2}n], which exists as a stable 3D microporous network (see picture). The approximate channel sizes of this material is 8×8 Å2 along its c axis and 6×2 Å2 along the a and b axes. At 36 atm, the density of methane adsorbed in micropore volume is 0.21 g mL−1, which is superior to that of any reported zeolites.

Flexible and dynamic channels created by an interdigitated framework of microporous coordination polymers are shown on the cover picture. The compound undergoes reversible crystal-to-crystal transformation from a nonporous (closed-form) to a microporous (open-form) structure, which is triggered by adsorption of supercritical gases. A hysteretic isotherm, shown bottom left, displays abrupt adsorption at a gateopening pressure and equally sharp desorption at a gate-closing pressure. More about this coordination polymer is reported in the Communication by S. Kitagawa et al. on page 428 ff.

Stable tunable channels are formed by pillared‐layer‐type coordination networks [{Cu2(pzdc)2(L)}n] (pzdc = pyrazine‐2,3‐dicarboxylate; L = pyrazine, 4,4′‐bipyridine, N‐(4‐pyridyl)isonicotinamide). Not only their channel sizes, shapes, and chemical environments are systematically built up by tuning the pillar ligands, but also the porosity is maintained in the absence of the included guest molecules. These compounds can adsorb methane, and the amount of gas adsorption is controllable by the type of pillar ligands.

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The reactions of porous two-dimensional copper dicarboxylates (copper fumarate, copper terephthalate, copper styrene dicarboxylate, and copper 4,4‘-biphenyl dicarboxylate) with triethylenediamine as a pillar ligand yielded porous three-dimensional coordination polymers. The characterization by gas adsorption indicated that these coordination polymers have uniform micropores, high porosities, and gas adsorption capacities. These properties depend on the kind of dicarboxylate, and by changing it, the porosity and the pore size of the polymer can be controlled. The measurements of methane adsorption isotherms revealed that all coordination polymers have methane adsorption capacities, and especially, polymers synthesized from copper styrene dicarboxylate and copper 4,4‘-biphenyl dicarboxylate, which have ideal pore sizes and distributions for methane adsorption, have higher methane adsorption capacities than that of the theoretical maximum for activated carbon.

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