4,4′-Biphenyldisulfonic acid induced coordination polymers of symmetrical tetramethyl cucurbit[6]uril with alkaline-earth metals for detection of antibiotics?

CrystEngComm Pub Date: 2023-01-18 DOI: 10.1039/D2CE01470J

Abstract

Three new coordination polymers based on macrocyclic symmetrical tetramethyl cucurbit[6]uril (TMeQ[6]) with formulae {[Ca2(C40H44N24O12)(H2O)10](C12H8O6S2)2}·13H2O (1), {[Sr(C40H44N24O12)(H2O)4](C12H8O6S2)}·13H2O (2), and {[Ba2(C40H44N24O12)(C12H8O6S2)](C12H8O6S2)(H2O)7}·12H2O (3) have been obtained by the self-assembly of TMeQ[6] with the corresponding alkaline-earth metal salts in the presence of 4,4′-biphenyldisulfonic acid (H2BPDS). Single crystal X-ray diffraction analysis of these three coordination polymers reveals that the deprotonated 4,4′-biphenyldisulfonic acid (H2BPDS2?) plays an important role in the self-assembly of these coordination polymers. In complexes 1 and 2, only the TMeQ[6] is involved in coordination with the Ca2+ and Sr2+ ions. The BPDS2? is involved in “outer-surface interactions” with the TMeQ[6]. Meanwhile, in complex 3, the BPDS2? is also coordinated with the Ba2+ ion. These coordination polymers provide a new strategy to design and construct Q[n]-based poly-dimensional coordination polymers, which can be built by one-dimensional Q[n]-metal coordination chains via outer-surface interactions. Furthermore, complex 1 can detect NFX (norfloxacin) molecules with high selectivity.

Graphical abstract: 4,4′-Biphenyldisulfonic acid induced coordination polymers of symmetrical tetramethyl cucurbit[6]uril with alkaline-earth metals for detection of antibiotics
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