Abstract
Lithium tetrakis(4-boronatoaryl)borates were subjected to polycondensation reactions with selected polyhydroxyl monomers such as 2,3,6,7,10,11-hexahydroxytriphenylene (HHTP) and 2,3,6,7-tetrahydroxy-9,10-dimethylanthracene (THDMA). Obtained boronate-type ionic porous polymers TAB1–4 were characterized by PXRD, 6Li and 11B magic-angle spinning nuclear magnetic resonance (MAS NMR), FT-IR, SEM, and TGA. They exhibit relatively good sorption of H2 (up to 75 cm3/g STP), whereas N2 uptake at 77 K for lower pressure range is relatively poor (up to 50 cm3/g STP below P/P0 = 0.8). In addition, the effect of elongation of aryl arms in the tetraarylborate core on the materials’ properties was studied. Thus, it was found that replacement of the 4-boronatophenyl with 4-boronatobiphenylyl group has a negative impact on the sorption characteristics.
Highlights
Nanoporous ionic organic networks (NIONs) comprise negative or positive charges whereas free counterions are located in pores to maintain electrical neutrality of the structure
The selection and optimization of a synthetic strategy is crucial for achieving desired porous structural parameters such as pore shape, pore size, pore distribution profile, etc
The majority of them possessed a neutral character whereas examples of boron-based NIONs are scarce [4]
Summary
Nanoporous ionic organic networks (NIONs) comprise negative or positive charges whereas free counterions are located in pores to maintain electrical neutrality of the structure. The synthesis of nanoporous ionic networks has recently attracted a significant interest due to additional possibilities offered by these materials in comparison to neutral porous polymers. The direct synthesis from appropriate building blocks seems to be still the most versatile method Other approaches such as hard/soft templating method, the ionic complexation method as well as postsynthetic modifications are in use. The use of precursors possessing a general tetrahedral topology imposes a three-dimensional structure of a resulting polymer network. Many examples of such systems were reported in the recent literature. It should be noted that the presented materials featured nonionic structures Within this group, classical examples include highly porous materials COF-102 and COF-103 based on tetraboronic acids C[p-C6 H4 B(OH)2 ]4 and Si[p-C6 H4 B(OH)2 ]4 , respectively [2]. The majority of them possessed a neutral character whereas examples of boron-based NIONs are scarce [4]
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