Supramolecular host-guest assemblies can exhibit co-conformational isomerism in solution, increasing the complexity of the system because of its dynamic nature. A detailed analysis of model systems, designed to evaluate the different effects associated with each co-conformer, is needed. Recently, the equilibria between supramolecular complex co-conformations in solution have been shown.1 On the other hand, we have previously reported the study of co-conformational isomerism in simple and neutral host-guest complexes formed by cationic bipyridinium guests and anionic anti-disulfo-dibenzo[24]crown-8 [DSDB24C8]2- as the host in polar media.2 Now, we are interested in the efect of the number of bipyridinium units and its substituents in the co-conformational isomerism equilibria with the macrocycle [DSDB24C8]2- in aqueous solution. Preliminary results show that the linear guest [XyMe]4+ and the macrocycle [DSDB24C8]2- generate a partially threaded supramolecular complex, with a 1 : 2 stoichiometry and fast association/dissociation process in the NMR time scale (see figure for the X-ray structure). 1. a) V. Balzani, A. Credi, F. M. Raymo, F. Stoddart, Angew. Chem. Int. Ed. 2000, 39, 3348-3391. b) X. Xiao, Q. Hu, Z. Tao, Y. Q. Zhang, S. F. Xue, Q. J. Zhu, G. Wei, Chem. Phys. Lett. 2011, 514, 317-320. c) A. E. Kaifer, Acc. Chem. Res. 2014, 47, 2160-2167. 2. R. Cervantes, R. I. Sanchez, J. Tiburcio, Chem. Eur. J., 2013, 19, 4051-4057.

Threaded and non-threaded host-guest complexes based on bipyridinium and sulfonated crown ether species in aqueous solution

251st National Meeting (2016)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.