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Eight bis-,two tris-and two mono-crown ethers of Schiff base type have been pre-parcd by the reaction of 4’-formylbenzo-15-crown-5 with diamincs.Conductivity measurementsshow that the bis-crown ethers form 1:1 complexes(crown cther unit:metal ion)with sodiumion and 2:1 complexes with potassium,rubidium and ammonium ion,respectively.