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Key indicators: single-crystal X-ray study; T = 294 K; mean (C-C) = 0.004 Å; R factor = 0.037; wR factor = 0.105; data-to-parameter ratio = 17.7.The tetradentate dianion in the title complex hydrate, [Cu(C 23 H 28 N 2 O 4 )]ÁH 2 O, provides the Cu II atom with a cis-N 2 O 2 donor set. There is a significant twist from a regular square-planar geometry with the dihedral angle formed between the two six-membered CuOC 3 N chelate rings being 32.14 (8). The water molecule forms hydrogen bonds to each of the coordinating O atoms of a given complex molecule. Supramolecular layers in the bc plane are formed in the crystal packing through C-HÁ Á ÁO and C-HÁ Á Á interactions. Related literature

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