Structures and solution dynamics of pseudorotaxanes mediated by alkali-metal cations |
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Authors: | Pascu Sofia I Naumann Christoph Kaiser Guido Bond Andrew D Sanders Jeremy K M Jarrosson Thibaut |
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Institution: | Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, UKCB2 1EW. |
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Abstract: | Kinetic stability studies of a series of pseudorotaxanes formed from electron-rich crown ethers (hosts and ) and naphthalene diimide (guest ) in the presence of alkali salt templates MX (where M(+) = Li(+) and Na(+), and X(-) = Cl(-), Br(-), I(-), NO(3)(-) and CF(3)SO(3)(-)) were performed by (1)H NMR. The switching between the (bound) host and its linkage isomer host (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: .], M(2)..](2+) and M(2)..](2+). Their solution-phase structures are in good agreement with the solid-state structures determined by X-ray crystallography. |
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