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首页> 外文期刊>Crystal growth & design >Unprecedented tuning of structures and gas sorption properties of two 2D nickel metal-organic frameworks via altering the positions of fluorine atoms in azamacrocyclic ligands
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Unprecedented tuning of structures and gas sorption properties of two 2D nickel metal-organic frameworks via altering the positions of fluorine atoms in azamacrocyclic ligands

机译:通过改变氮杂大环配体中氟原子的位置,前所未有地调节两个二维镍金属-有机骨架的结构和气体吸附性能

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Two 2D metal-organic frameworks (MOFs) of [NiL~1] _3[BTC]_2·7H2O·6DMF (1) and [NiL ~2]_3[BTC]_2·H_2O· 3DMF (2) have been constructed using macrocyclic Ni(II) complexes ([NiL ~1](ClO_4)_2/[NiL~2](ClO _4)_2) and BTC~(3-) as building blocks [Lvp ~1 = 3,10-bis(4-fluorobenzyl)-1,3,5,8,10,12-hexaazacyclotetradecane, L~2 = 3,10-bis(2-fluorobenzyl)-1,3,5, 8,10,12-hexaazacyclotetradecane, and BTC~3- = 1,3,5-benzenetricarboxylate]. The results of X-ray diffraction analyses indicate that 1 shows a 2D brick wall structure with BTC ~(3-) bridging three [NiL~1]~(2+) via C_1 symmetry, while 2 displays a 2D honeycomb-like structure with BTC~(3-) bridging three [NiL~2]~(2+) via C_3 symmetry. The results of gas sorption measurements indicate that desolvated 1 can selectively adsorb CO_2 rather than N_2 and H_2, while desolvated 2 cannot adsorb any of these gases under the same condition. More interestingly, the sorption isotherm of CO_2 for desolvated 1 shows a large hysteresis. The different sorption properties of desolvated 1 and 2 can be attributed to their different structures tuned by the positions of the fluorine atoms in the macrocyclic ligands.
机译:使用大环构造了[NiL〜1] _3 [BTC] _2·7H2O·6DMF(1)和[NiL〜2] _3 [BTC] _2·H_2O·3DMF(2)的两个二维金属有机骨架(MOF)。 Ni(II)配合物([NiL〜1](ClO_4)_2 / [NiL〜2](ClO _4)_2)和BTC〜(3-)作为结构单元[Lvp〜1 = 3,10-bis(4-氟苄基)-1,3,5,8,10,12-六氮杂环十四烷,L〜2 = 3,10-双(2-氟苄基)-1,3,5,8,10,12-六氮杂环十四烷和BTC〜3 -= 1,3,5-苯三羧酸酯]。 X射线衍射分析的结果表明:1显示2D砖墙结构,BTC〜(3-)通过C_1对称桥接三个[NiL〜1]〜(2+),而2显示2D蜂窝状结构,其中BTC〜(3-)通过C_3对称性桥接三个[NiL〜2]〜(2+)。气体吸附测量的结果表明,在相同条件下,去溶剂化的1可以选择性地吸附CO_2而不是N_2和H_2,而去溶剂化的2不能吸附任何这些气体。更有趣的是,去溶剂化的1 CO_2的吸附等温线显示出较大的滞后现象。脱溶剂的1和2的不同吸附性能可以归因于它们的不同结构,该结构通过大环配体中氟原子的位置调节。

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