The Cd(II) atom in the title complex, [Cd(NO(3))(C(18)H(40)N(4))]NO(3)·0.5H(2)O, is coordinated within a cis-N(4)O(2) donor set provided by the tetra-dentate macrocyclic ligand and two O atoms of a nitrate anion; the coordination geometry is distorted octa-hedral. The lattice water mol-ecule is located on a twofold rotation axis. N-H⋯O hydrogen bonds and weak C-H⋯O inter-actions link the complex cations into a supra-molecular layer in the bc plane. Layers are connected by O-H⋯O hydrogen bonds between the lattice water mol-ecule and the non-coordinating nitrate anion, as well as by weak C-H⋯O contacts.
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