A [Cu(3)(μ(3)-O)]–pyrazolate metallacycle with terminal nitrate ligands exhibiting point group symmetry 3

The trinuclear triangular cuprate anion of the title compound, tris­[bis­(tri­phenyl­phospho­ranyl­idene)ammonium] tris­(μ(2)-4-chloro­pyrazolato-κ(2) N:N′)-μ(3)-oxido-tris­[(nitrato-κ(2) O,O′)cuprate(II)] nitrate monohydrate, (C(36)H(30)P(2)N)[Cu(3)(C(3)H(2)ClN(2))(3)(NO(3))(3)O]NO(3)·H(2)O, has point group symmetry 3., with the μ(3)-O atom located on the threefold rotation axis. The distorted square-pyramidal coordination sphere of the Cu(II) atom is completed by two N atoms of trans-bridging pyrazolate groups and a chelating nitrate anion. The complex anion is slightly bent, with the nitrate and pyrazolate groups occupying positions above and below the Cu(3) plane, respectively. In the crystal, weak O—H⋯O and C—H⋯O hydrogen bonds, as well as π–π inter­actions, are present.