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.
Stabile Kanäle mit einstellbaren Eigenschaften werden in [{Cu2(pzdc)2(L)}n]‐Koordinationsnetzen des Säulen‐Schicht‐Typs gebildet (pzdc=Pyrazin‐2,3‐dicarboxylat; L=Pyrazin, 4,4′‐Bipyridin oder N‐(4‐Pyridyl)isonicotinamid). Durch Wahl der Säulenliganden lassen sich Größe, Form und chemische Umgebung der Kanäle systematisch einstellen; die Porosität bleibt auch ohne Gastmoleküle erhalten. Die Verbindungen können Methan adsorbieren, und die adsorbierte Gasmenge ist durch die Art des Säulenliganden kontrollierbar.
Eine reversible Aufnahme von Gasen kennzeichnet die Koordinationspolymere {[M2(4,4′‐bpy)3(NO3)4]‐(H2O)x}n (M = Co, x = 4; M = Ni, x = 4; M = Zn, x = 2), die aus M(NO3)2 und 4,4′‐Bipyridin in Aceton/Ethanol entstehen. Die kanalförmigen Hohlräume in ihren Gerüststrukturen (rechts schematisch gezeigt) sind entlang der a‐Achse ca. 3 × 6 und entlang der b‐Achse ca. 3 × 3 Å groß und nehmen im Druckbereich 1–36 atm reversibel CH4, N2 und O2 auf, ohne daß die Kristallstruktur deformiert wird.
Three zinc(II) coordination polymers, [Zn(4,4′-bpy)(NCS)2]n(4,4′-bpy = 4,4′-bipyridine; 1), {[Zn(4,4′-bpy)(SO4)(H2O)3]·3H2O}n (2), and {[Zn2(azpy)2(SO4)2(H2O)3]·0.5(azpy)}n (azpy = 4,4′-azopyridine; 3) have been synthesized and structurally characterized. 1 and 2 show assembled structure of one-dimensional chains, while 3 has a three-dimensional structure with pillared-layer type network. The important effect of counter anions on the coordination network was studied.
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