Synthesis of a bistable [3]rotaxane and its pH-controlled intramolecular charge-transfer behavior
摘要:
A [3]rotaxane 1 involving two naphtho-21-crown-7 (N21C7) rings and a dumbbell-shaped component 4 was synthesized. The dumbbell-shape molecule 4 contains one viologen nucleus, two secondary alkyl ammonium sites and two phenyl stoppers. After threading the N21C7 ring with the thread-like ammonium guest 3, the copper(I)-catalyzed Huisgen alkyne-azide 1,3-dipolar cycloaddition (CuAAC "click" reaction), was performed to connect the pseudorotaxanes with viologen unit 2 and generate 1. Through treating the [3]rotaxane by the base and acid circularly, the two N21C7 rings can make shuttling motion along the axle. Meanwhile the distance between the electron-deficient viologen unit and the electron-rich naphthol group can be adjusted precisely along with a remarkable intramolecular charge-transfer (CT) behavior. (c) 2013 Yu Liu. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
[2]Pseudorotaxanes Based on Naphtho-21-crown-7 and Secondary Dialkylammonium Salts: Remarkably Improved Association Constants Among Four Threaded Structures
This research article is focused on the recognition interaction of a new host naphtho‐21‐crown‐7 and four secondarydialkylammoniumsalts. In acetone, they can form 1:1 host‐guest complexes which belong to slow‐exchange systems. We also found the differences of binding affinity and binding selectivity between the host and its complementary guest moieties, which could be ascribed to the aromatic π‐π
CZECH, B.;CZECH, A.;BARTSCH, R. A., J. HETEROCYCL. CHEM., 1984, 21, N 2, 341-343
作者:CZECH, B.、CZECH, A.、BARTSCH, R. A.
DOI:——
日期:——
Czech, B.; Czech, A.; Bartsch, R. A., Journal of Heterocyclic Chemistry, 1984, vol. 21, p. 341 - 343
作者:Czech, B.、Czech, A.、Bartsch, R. A.
DOI:——
日期:——
Synthesis of a bistable [3]rotaxane and its pH-controlled intramolecular charge-transfer behavior
作者:Hui Wang、Zhi-Jun Zhang、Heng-Yi Zhang、Yu Liu
DOI:10.1016/j.cclet.2013.04.007
日期:2013.7
A [3]rotaxane 1 involving two naphtho-21-crown-7 (N21C7) rings and a dumbbell-shaped component 4 was synthesized. The dumbbell-shape molecule 4 contains one viologen nucleus, two secondary alkyl ammonium sites and two phenyl stoppers. After threading the N21C7 ring with the thread-like ammonium guest 3, the copper(I)-catalyzed Huisgen alkyne-azide 1,3-dipolar cycloaddition (CuAAC "click" reaction), was performed to connect the pseudorotaxanes with viologen unit 2 and generate 1. Through treating the [3]rotaxane by the base and acid circularly, the two N21C7 rings can make shuttling motion along the axle. Meanwhile the distance between the electron-deficient viologen unit and the electron-rich naphthol group can be adjusted precisely along with a remarkable intramolecular charge-transfer (CT) behavior. (c) 2013 Yu Liu. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.