Abstract
AbstractThe cover picture The cover picture shows two crystal structures of porous coordination polymers, [Cu(SiF6)(4,4′bpy)2]n and [Zn(SiF6)(pyz)2]n (4,4′‐bpy = 4,4′‐bipyridine, pyz = pyrazine), which have been generated from square‐grid coordination polymers that are cross‐linked by ν‐SiF6 anions. Although typical bridging ligands such as 4,4′‐bpy and 1,4‐benzenedicarboxylate produce open octahedral coordination polymers with micropores, such micropores need to be further narrowed to become ultramicropores (< 7 Å) for separation and purification of smaller gas molecules. We have succeeded in obtaining the ultramicroporous coordination polymer [Zn(SiF6)(pyz)2]n with 4.5 ± 4.5 Å2 pores by simply replacing 4,4′‐bpy in [M(SiF6)(4,4′‐bpy)2]n (M = Zn2+, Cu2+) with pyz. The ultramicropores of [Zn(SiF6)(pyz)2]n adsorb Me2CO rather than iPrOH, showing the size‐exclusive effect. Additionally this compound shows a sharp uptake in H2 adsorption at 77 K, because the interaction potential is expected to be strong as a result of the synergistic effect of the neighbouring pore walls. Details are discussed in the article by K. Uemura et al. on p. 2329 ff.
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