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A new reinforced macrobicyclic cryptophane (L1) has been synthesized by assembling two N,N ,N -(2-piperazinylethyl)amine (L) subunits via three p-xylene bridges. The molecular structure of L1 confers on the ligand a ditopic nature towards complexation of both cationic and anionic substrates. Both L and L1 form mononuclear Cu 2+ complexes in solution, while L1 also forms a very stable...
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