Crystal Structure of 3,4:11,12-Dibenzo-5,10-dioxa-1,14,17-tri-azacyclononadecane

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The title compound, C₂₂H₃₁N₃O₂, consists of a 19-membered triaza-crown ether ligand with two O atoms and three N atoms. It belongs to the space group C2/c with cell parameters a = 26.753(3), b = 9.1004(18), c = 19.160(3)Å and β = 115.950(12)°. The macrocyclic ring contains N-H…O hydrogen bonds. The relative macrocyclic inner-hole size is estimated to be 1.93 Å.