Twisted Cucurbit[n]urils

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• 作者：Qing Li ; Sheng-Chao Qiu ; Jing Zhang ; Kai Chen ; Ying Huang ; Xin Xiao ; Yingjie Zhang ; Feng Li ; Yun-Qian Zhang ; Sai-Feng Xue ; Qian-Jiang Zhu ; Zhu Tao ; Leonard F. Lindoy ; Gang Wei
• 刊名：Organic Letters
• 出版年：2016
• 出版时间：August 19, 2016
• 年：2016
• 卷：18
• 期：16
• 页码：4020-4023
• 全文大小：315K
• 年卷期：0
• ISSN：1523-7052

文摘

Two new twisted cucurbiturils, cucurbit[13]uril (tQ[13]) and cucurbit[15]uril (tQ[15]), have been synthesized and separated, and their structures have been confirmed by NMR spectroscopy and MALDI-TOF mass spectrometry together with the X-ray structures of two new complexes, {Dy(H₂O)₄Cd(H₂O)₄tQ[13]}·2.5[CdCl₄]·65H₂O and {Cd_0.5(H₂O)₂tQ[15]}·[CdCl₄]·47H₂O. tQ[15] is the largest cucurbit[n]uril (Q[n]) in the Q[n] family reported to date. The X-ray diffraction studies of both complexes indicated that these large tQ[n]s effectively exhibit two different cavities–a central cavity and two side cavities. Preliminary host–guest behavior by each of the new systems was investigated by NMR studies.