A rare case for binding a diquat salt by two cyclo[6]aramides |
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| Authors: | Min Xu Long Chen Yiming Jia Lijun Mao Wen Feng Yi Ren |
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| Institution: | Key Laboratory for Radiation Physics and Technology of Ministry of Education, College of Chemistry, Institute of Nuclear Science and Technology, Sichuan University, 29 Wangjiang Road, Chengdu 610064, P.R. China |
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| Abstract: | The non-aggregational cyclo6]aramide has demonstrated 2:1 host–guest complexation towards diquat with very strong binding ability (K1 = 5.41 × 104 M? 1, K2 = 4.33 × 106 M? 1). The donor–acceptor binding process of the macrocycle and the quaternary salt was investigated by 1H NMR, ESI mass spectrometry and UV–vis spectroscopy. The binding mode is supported by both experiments and theoretical simulations. This work provides the first example of using recently developed H-bonded aromatic oligoamide macrocycles for binding diquat in solution. |
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| Keywords: | cyclo[6]aramide diquat host–guest complexation hydrogen bonding |
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