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Syntheses, Crystal Structures and Adsorption Properties of Ultramicroporous Coordination Polymers Constructed from Hexafluorosilicate Ions and Pyrazine (Eur. J. Inorg. Chem. 16/2009)
Author(s) -
Uemura Kazuhiro,
Maeda Akihisa,
Maji Tapas Kumar,
Kanoo Prakash,
Kita Hidetoshi
Publication year - 2009
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200990041
Subject(s) - chemistry , pyrazine , adsorption , octahedron , crystallography , molecule , coordination polymer , polymer , bipyridine , crystal structure , 4,4' bipyridine , inorganic chemistry , stereochemistry , organic chemistry , hydrogen bond
The cover picture The cover picture shows two crystal structures of porous coordination polymers, [Cu(SiF 6 )(4,4′bpy) 2 ] n and [Zn(SiF 6 )(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‐SiF 6 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(SiF 6 )(pyz) 2 ] n with 4.5 ± 4.5 Å 2 pores by simply replacing 4,4′‐bpy in [M(SiF 6 )(4,4′‐bpy) 2 ] n (M = Zn 2+ , Cu 2+ ) with pyz. The ultramicropores of [Zn(SiF 6 )(pyz) 2 ] n adsorb Me 2 CO rather than i PrOH, showing the size‐exclusive effect. Additionally this compound shows a sharp uptake in H 2 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.