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The title compound, [Ni(C8H5O4)(C16H36N4)]ClO4·H2O, has the NiII atom in a distorted octahedral geometry, surrounded by coordination by four N atoms of the 5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane ligand in a folded configuration, and two carboxylate O atoms of the 2-carboxybenzoate ligand in cis positions. The complex cation, the disordered perchlorate anion [occupancies 0.639 (8):0.361 (8)] and uncoordinated water molecules engage in N—H...O and O—H...O hydrogen bonding, forming a layer structure parallel to (010).