A novel bis-zinc(I1) receptor (bis(Znn<~clen)), which has two macrocyclic tetraamhe Znn complexes connected through a m-xylene bridge, has been synthesized as a potential host for barbiturates and phosphates in aqueous solution.The new zinc(II) complex, bis(Zn"-cyclen) was proven to be an excellent host for barbital and forms a stable 1 : 1 complex (Zn2L-barbital2-) in aqueous solution (K,, = [Zn2Lbarbita12~]l[uncomplexed Zn,L][uncomplexed barbital] = lo5 M-' at 25 "C and pH 8).wherein both imido groups of the barbital
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Kimura et al. (1996) studied this question.