199 ChemInform Abstract The hosts (I) and (II) form 1:1 complexes with alkali-metal ions (clamshell or sandwich-like structure) or with protonated aliphatic or aromatic diamines (such as 1,7-diammoniumheptane or o-phenylenediammonium dipicrate). The diammonium guest is wedged in between the o-xylylene walls of the hosts.
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