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DOI: 10.1039/A901041F (Paper) Reference Section for: J. Chem. Soc., Dalton Trans., 1999, 2097-2102

Conformational choice in disilver cryptates; an 1H NMR and structural study

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Oliver W. Howarth, Grace G. Morgan, Vickie McKee and Jane Nelson

Abstract

Disilver complexes of three iminocryptands, with either tris(aminopropylamine)- or tris(aminoethylamine)-derived caps {N[(CH2)nNCHRCHN(CH2)n]3N (n = 2 or 3, R = 1,3-(CH2)2C6H4 or 2,5-(CH2)2C4H4O)} have been structurally characterised, and show relatively close approach of the silver(I) ions (3.08–3.77 Å). Differences in the geometry of the coordination site adopted can be related to the flexibility of the cryptand host. This is also important in solution, where the smaller cap-size cryptates are restricted to one conformation while the larger cap-size cryptates appear ready to adopt a range of conformations.

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