Taming the topology of calix[4]arene-based 2D-covalent organic frameworks
A bowl-shaped calix[4]arene with its exciting host–guest chemistry is a versatile supramolecular building block for the synthesis of distinct coordination cages or metal–organic frameworks. However, its utility in the synthesis of crystalline covalent organic frameworks (COFs) remains challenging, presumably due to its conformational flexibility. Here, we report the synthesis of a periodic 2D extended organic network of calix[4]arenes joined by a linear benzidine linker via dynamic imine bonds. By tuning the interaction among neighboring calixarene units through varying the concentration in the reaction mixture, we show the selective formation of interpenetrated (CX4-BD-1) and non-interpenetrated (CX4-BD-2) frameworks. The cone-shaped calixarene moiety in the structural backbone allows for the interweaving of two neighboring layers in CX4-BD-1, making it a unique example of interpenetrated 2D layers. Due to the high negative surface charge from calixarene units, both COFs have shown high performance in charge-selective dye removal and an exceptional selectivity for cationic dyes irrespective of their molecular size. The charge distribution of the COFs and the resulting selectivity for the cationic dyes were further investigated using computational methods.
2021
2021-03-16 08:07:14
1033
dyes and pigments, covalent organic frameworks, adsorption, layers, chemical structure
Bikash
Garai
70
Dinesh
Shetty
70
Tina
Škorjanc
70
Felipe
Gándara
70
Nawavi
Naleem
70
Sabu
Varghese
70
Sudhir Kumar
Sharma
70
Maria
Baias
70
Ramesh
Jagannathan
70
Mark Anthony
Olson
70
COBISS_ID
3
55367939
UDK
4
54
ISSN pri članku
9
0002-7863
DOI
15
10.1021/jacs.0c12125
NUK URN
18
URN:SI:UNG:REP:IOXFYULV
jacs.0c12125.pdf
7933550
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2021-03-16 08:07:49
0
Izvorni URL
2021-03-16 08:07:15