title: Tetra-kis(2,2'-bipyrid-yl)dichlorido-di-μ(3)-hydroxido-di-μ(2)-hydroxido-tetra-copper(II) dinitrate hexa-hydrate.
abstract: The tetra-nuclear copper(II) title complex, [Cu(4)Cl(2)(OH)(4)(C(10)H(8)N(2))(4)](NO(3))(2)·6H(2)O, has a crystallographically imposed centre of symmetry. The metal atoms display a distorted tetragonal-pyramidal coordination geometry, and are linked by two μ(2)- and two μ(3)-hydroxo groups, assuming a chair-like conformation for the Cu(4)O(2) core. In the crystal, the complex mol-ecules are linked into a three-dimensional network by inter-molecular O-H⋯O, O-H⋯Cl, C-H⋯O and C-H⋯Cl hydrogen bonds and π-π stacking inter-actions with centroid-centroid separations of 3.724 (2) and 3.767 (3) Å.
authors.forename: Ying
authors.initials: Y
authors.lastname: Fan
authors.forename: Yong-Tao
authors.initials: YT
authors.lastname: Cui
authors.forename: Hui-Fen
authors.initials: HF
authors.lastname: Qian
authors.forename: Jian-Lan
authors.initials: JL
authors.lastname: Liu
authors.forename: Wei
authors.initials: W
authors.lastname: Huang