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The crystal and mol-ecular structures of the title Cu II complex, isolated as a dihydrate, [Cu(C 21 H 14 N 3 O 3 ) 2 ]·2H 2 O, reveals a highly distorted coordination geometry inter-mediate between square-planar and tetra-hedral defined by an N 2 O 2 donor set derived from two mono-anionic bidentate ligands. Furthermore, each six-membered chelate ring adopts an envelope conformation with the Cu atom being the flap. In the crystal, imidazolyl-amine-N-H⋯O(water), water-O-H⋯O(coordinated, nitro and water), phenyl-C-H⋯O(nitro) and π(imidazol-yl)-π(nitro-benzene) [inter-centroid distances = 3.7452 (14) and 3.6647 (13) Å] contacts link the components into a supra-molecular layer lying parallel to (101). The connections between layers forming a three-dimensional architecture are of the types nitro-benzene-C-H⋯O(nitro) and phenyl-C-H⋯π(phen-yl). The distorted coordination geometry for the Cu II atom is highlighted in an analysis of the Hirshfeld surface calculated for the metal centre alone. The significance of the inter-molecular contacts is also revealed in a study of the calculated Hirshfeld surfaces; the dominant contacts in the crystal are H⋯H (41.0%), O⋯H/H⋯O (27.1%) and C⋯H/H⋯C (19.6%).

Bis[2-(4,5-diphenyl-1H-imidazol-2-yl)-4-nitrophenolato]copper(II) dihydrate: crystal structure and Hirshfeld surface analysis