Citation: Jun-Ming Yi, Xin-Long Ni, Xin Xiao, Li-Bing Lu, Sai-Feng Xue, Qian-Jiang Zhu, Zhu Tao. Complexation of sym-bis(benzimidazole)-2, 2’-ethylene salts with cucurbit[6]uril derivatives：A potential axle molecule for pseudorotaxanes[J]. Chinese Chemical Letters, ;2013, 24(05): 362-366. shu

Complexation of sym-bis(benzimidazole)-2, 2’-ethylene salts with cucurbit[6]uril derivatives：A potential axle molecule for pseudorotaxanes

1.
Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province, Guizhou University, Guiyang 550025, China

Corresponding author: Xin-Long Ni, Zhu Tao,
Received Date: 23 January 2013
Available Online: 4 March 2013

Sym-bis(benzimidazole)-2,2'-ethylene cations act as a new axle template for threading cucurbit[6]uril derivatives on, forming [2]pseudorotaxane and [3]pseudorotaxane. These new complexes have been studied using ¹H NMR, UV-vis absorption spectroscopy and X-ray analysis. Changes in the ¹H NMR spectra indicate that the two types of pseudorotaxane can be formed by varying the host concentration. UV-vis absorption titration experiments at different pH values demonstrate that interesting pK_a shifts of the bis-benzimidazole derivatives can be induced by the host-guest complexation. The associated constants were calculated to be 2.81×10⁴ L/mol and 9.06×10⁶ L/mol for the [2]pseudorotaxanes and [3]pseudorotaxanes, respectively. Furthermore, X-ray diffraction studies of the solid state structures provide unequivocal proof of the host concentration dependent pseudorotaxane, which is strongly in line with the evidences in solution.
- Cucurnit[6]uril derivatives,
- Bis(benzimidazole) derivatives,
- Pseudorotaxane,
- Crystal structure
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