期刊
INORGANIC CHEMISTRY
卷 48, 期 23, 页码 11067-11078出版社
AMER CHEMICAL SOC
DOI: 10.1021/ic901429u
关键词
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资金
- Engineering and Physical Science Research Council (EPSRC)
- European Research Council (ERC)
- University of Nottingham
- CVCP
- Royal Society Wolfson Merit Award
- Engineering and Physical Sciences Research Council [EP/C528964/1] Funding Source: researchfish
We have synthesized five new metal-organic coordination polymers incorporating the bent ligand H(2)hfipbb [4,4'-(hexafluoroisopropylidene)bis(benzoic acid)) with different transition metal ions and co-ligands via solvothermal reactions to give [Zn-2(hfipbb)(2)(Py)2] center dot DMF (1), [Zn-2(hfipbb)(2)(4,4'-bipy)(H2O)] (2), [Zn-2(hfipbb)(2)(bpdab)] center dot 2DMF (3), [Cd-2(hfipbb)(2)(DMF)(2)] center dot 2DMF (4), and [Co(hfipbb)(dpp)] center dot MeOH (5) (py = pyridine, 4,4'-bipy = 4,4'-bipyridine, bpdab = 1,4-bis(4-pyridyl)-2,3-diaza-1,3-butadiene, dpp = 1,3-di(4-pyridyl)propane). Compound 1 displays a 2-fold 2D -> 2D parallel interpenetrated layer network with one-dimensional (1D) helical channels, while 3 exhibits a three-dimensional pillared helical-layer open framework of alpha-Po topology based upon binuclear paddlewheel units. In compounds 2 and 5, binuclear motifs with double carboxylate bridges are linked by hfipbb(2-) ligands into a 1D ribbon, which are further assembled into two-dimensional non-interpenetrated (4,4) layers via bipyridyl co-ligands. However, the different bridging modes of hfipbb(2-) ligands and the different disposition of the coordinated co-ligands around metal ions result in subtle differences in the final architecture. Thus, 2 is based on a binuclear cluster node, double-stranded hfipbb(2-) linkers, and single-stranded 4,4'-bipy linkers, while 5 is based on a binuclear cluster node and hfipbb(2-) and dpp linkers which are both double-stranded. Among these compounds, the Cd(II) complex 4 is possibly the most interesting because it represents a rare example in which metal centers are linked by carboxylate groups into infinite chains further joined together by hfipbb(2-) spacers to form a 2D network with tubular helical channels. All these coordination polymers exhibit low solvent-accessible volumes, Both 3 and 4 retain structural integrity and permanent microporosity upon evacuation of guest molecules, with hydrogen uptakes of 0.57 and 0.78 wt %, respectively, at 20 bar and 77 K.
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