A synthesis in good yield of a new hexaimino cryptand containing two tris(2-aminoethyl)amine moieties bridged by three naphthylene groups is reported. Ag+ and Cu+ cryptates of the ligand have also been prepared and characterized. The cryptand and cryptates have been structurally analyzed by X-ray diffraction, unveiling three different conformations. The macrobicyclic ligand has an anti conformation in the cryptand, but has a sym form in each cryptate. Although the Ag+ cryptates have a symmetric structure on the three arms, one of the three arms in the Cu+ complex shows remarkable bending. The bent conformation is intrinsic of the Cu+ complex, as indicated by X-ray analyses and MM2 calculations. The temperature dependence of the 1H NMR spectra has also been investigated, revealing fluxional behaviors of the ligand in each compound.
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