Assemblies of cucurbit[6]uril-based coordination complexes with disulfonate ligands: from discrete complexes to one- and two-dimensional polymers
Assemblies of cucurbit[6]uril-based coordination complexes with disulfonate ligands: from discrete complexes to one- and two-dimensional polymers
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DOI：
10.1039/d0ce01456g
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发表时间：
2021
期刊：
影响因子：
3.1
通讯作者：
Kai Chen;Zi-Yi Hua;Ran Li;Yu-Ying Peng;Q. Zhu;Jiang-Lin Zhao;C. Redshaw
中科院分区：
文献类型：
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作者：
Kai Chen;Zi-Yi Hua;Ran Li;Yu-Ying Peng;Q. Zhu;Jiang-Lin Zhao;C. Redshaw
在本工作中，通过瓜环（Q[6]）与不同萘二磺酸盐和碱土金属离子的配合，成功地分离出了9种新型的Q[6]基配合物，其分子式分别为[Ca（H2O）4（Q[6]）0.5（1，5-NDA）0.5]·（1，5-NDA）0.5·3 H2O（1），[Sr（H2O）4（Q[6]）0.5（1，5-NDA）0.5]·（1，5-NDA）0.5·4H2O（2）、[Ba（H2O）4（Q[6]）0.5（1，5-NDA）0.5]·（1，5-NDA）0.5·4H2O（3）、[Ca（H2O）5（Q[6]）0.5]（2，6-NDA）·9H2O（4）、[Sr（H2O）5（Q[6]）0.5]·（2，6-NDA）·6H2O（5）、[Ba2（H2O）7（Q[6]）（2，6-NDA）2]·11H2O（6）、[Sr（H2O）4（Q[6]）0.5（2，6-NDA）0.5]·（2，6-NDA）0.5·5H2O（7）、[Ca2（H2O）10（Q[6]）]（2，7-NDA）·14H2O（8）和[Sr（H2O）5（Q[6]）（2，7-NDA）]·4 H2O（9）（H2 NDA =萘二磺酸）。结构分析表明，Q[6]的羰基直接与碱土金属离子结合形成一维配位链。此外，金属离子还与萘的二磺酸根取代基连接，这在9的情况下产生简单的配位络合物，对于6，产生1D Q[6]-NDA-M2+链，并且在1-3和7的情况下，产生2D网络。相比之下，对于4、5和8，二磺酸盐配体不与金属结合，而是充当超分子连接体。这些化合物的三维超分子结构是通过各种非共价相互作用构建的，特别是涉及Q[6]的外表面相互作用。此外，物种2和7的荧光性质进行了研究，和传感实验表明，这两个都能够作为荧光传感器的Fe 3+具有高灵敏度和选择性。
In this work, the combination of cucurbit[6]uril (Q[6]) with various naphthalene disulfonates and alkaline-earth metal ions allows for successful isolation of 9 novel Q[6]-based coordination complexes with the formulas [Ca(H2O)4(Q[6])0.5(1,5-NDA)0.5]·(1,5-NDA)0.5·3H2O (1), [Sr(H2O)4(Q[6])0.5(1,5-NDA)0.5]·(1,5-NDA)0.5·4H2O (2), [Ba(H2O)4(Q[6])0.5(1,5-NDA)0.5]·(1,5-NDA)0.5·4H2O (3), [Ca(H2O)5(Q[6])0.5](2,6-NDA)·9H2O (4), [Sr(H2O)5(Q[6])0.5]·(2,6-NDA)·6H2O (5), [Ba2(H2O)7(Q[6])(2,6-NDA)2]·11H2O (6), [Sr(H2O)4(Q[6])0.5(2,6-NDA)0.5]·(2,6-NDA)0.5·5H2O (7), [Ca2(H2O)10(Q[6])](2,7-NDA)·14H2O (8) and [Sr(H2O)5(Q[6])(2,7-NDA)]·4H2O (9) (H2NDA = naphthalenedisulfonic acid). Structural analysis revealed that the carbonyl groups of Q[6] bind directly to the alkaline-earth metal ions to form 1D coordination chains. Moreover, the metal ions are also linked to the disulfonate substituents of the naphthalenes, which, in the case of 9, resulted in a simple coordination complex, for 6, a 1D Q[6]–NDA–M2+ chain, and in the case of 1–3 and 7, 2D networks. By contrast, for 4, 5 and 8, the disulfonate ligands do not bind to the metals, and instead, act as supramolecular linkers. The resultant 3D supramolecular architecture of these compounds was constructed through various noncovalent interactions, particularly involving outer-surface interactions of the Q[6]s. Furthermore, the fluorescence properties of species 2 and 7 were investigated, and sensing experiments indicated that both were capable of functioning as fluorescent sensors for Fe3+ with high sensitivity and selectivity.