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Issue 26, 2016
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pH-dependent formation of different coordination cages based on Co4-TC4A secondary building units and bridging ligands

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Abstract

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.

Graphical abstract: pH-dependent formation of different coordination cages based on Co4-TC4A secondary building units and bridging ligands

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Supplementary files

Article information


Submitted
06 Jan 2016
Accepted
28 Jan 2016
First published
01 Feb 2016

CrystEngComm, 2016,18, 4938-4943
Article type
Paper

pH-dependent formation of different coordination cages based on Co4-TC4A secondary building units and bridging ligands

X. Hang, S. Wang, X. Zhu, H. Han and W. Liao, CrystEngComm, 2016, 18, 4938
DOI: 10.1039/C6CE00028B

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