Two kinds of calixarene-based metal–organic coordination cages were obtained at different pH values despite using the same bridging ligand, either 5-(pyridin-3-yl)isophthalic acid (L1) or 5-(5-fluoropyridin-3-yl)isophthalic acid (L2), namely, [Co4(TC4A)Cl]4(Ln)4(HCOO)4(H2O)4]}·26DMF (CIAC-117 and CIAC-119) and H4[Co4(TC4A)Cl]4(Ln)8}·18CH3OH·33DMA (CIAC-118 and CIAC-120), where TC4A represents deprotonated p-tert-butylthiacalix[4]arene, and DMF and DMA represent N,N-dimethylformamide and N,N-dimethylacetamide, respectively. Tetrahedral coordination cages (CIAC-117 and CIAC-119) with shuttlecock-like Co4-TC4A secondary building units (SBUs) as the vertices and L1 and L2 as the three-connected linkers were prepared in the presence of tetramethylammonium hydroxide, while truncated octahedral coordination cages (CIAC-118 and CIAC-120) with L1 and L2 as the two-connected linkers were generated upon the addition of HCl. For CIAC-117, two types of activation methods, solvent exchange-heating and direct heating, were used to investigate the removal of guest molecules in the structure. N2 adsorption properties of activated samples were studied. Moreover, selective dye sorption of CIAC-120 was investigated.
尽管使用相同的桥联
配体5-(
吡啶-3-基)
间苯二甲酸(L1)或5-(5-
氟吡啶-3-基),但在不同的pH值下获得了两种基于杯
芳烃的
金属有机配位笼)
间苯二甲酸(
L2),即[Co4(TC4A)Cl]4(Ln)4(HCOO)4(
H2O)4]}·26
DMF (CIAC-117 和 CIAC-119)和 H4[Co4(TC4A)Cl]4(Ln)8}·18CH3OH·33
DMA(CIAC-118 和 CIAC-120),其中 TC4A 代表去质子化的对叔丁基
硫杂环[4 ]
芳烃,
DMF和
DMA分别表示N,N-二甲基甲酰胺和N,N-二甲基乙酰胺。在
四甲基氢氧化铵存在下制备了以羽毛球状Co4-TC4A二级结构单元(SBU)为顶点、L1和
L2为三连接体的四面体配位笼(CIAC-117和CIAC-119),而截角八面体协调笼(CIAC-118 和 CIAC-120),L1 和
L2 作为双连接连接器添加 HCl 后生成。对于CIAC-117,采用溶剂交换加热和直接加热两种活化方法来研究结构中客体分子的去除。研究了活化样品的N2吸附性能。此外,还研究了 CIAC-120 的选择性
染料吸附。