Structures and solution dynamics of pseudorotaxanes mediated by alkali-metal cations

Sofia I Pascu, C Naumann, G Kaiser, A D Bond, J K M Sanders, T Jarrosson

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Abstract

Kinetic stability studies of a series of pseudorotaxanes formed from electron-rich crown ethers (hosts 1 and 2) and naphthalene diimide (guest A) in the presence of alkali salt templates MX (where M+ = Li+ and Na+, and X- = Cl-, Br-, I-, NO3- and CF3SO3-) were performed by H-1 NMR. The switching between the (bound) host 1 and its linkage isomer host 2 (free) was monitored in solution in the presence and absence of alkali salts, to establish the relative thermodynamic stabilities in the series. We also report here six new crystal structures, for pseudorotaxanes of type: [1 center dot A], [M-2 center dot 1 center dot A](2+) and [M-2-2-A](2+). Their solution-phase structures are in good agreement with the solid-state structures determined by X-ray crystallography.
Original languageEnglish
Pages (from-to)3874-3884
Number of pages11
JournalDalton Transactions
Volume2007
Issue number35
DOIs
Publication statusPublished - 2007

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    Pascu, S. I., Naumann, C., Kaiser, G., Bond, A. D., Sanders, J. K. M., & Jarrosson, T. (2007). Structures and solution dynamics of pseudorotaxanes mediated by alkali-metal cations. Dalton Transactions, 2007(35), 3874-3884. https://doi.org/10.1039/b706043b