2D Hydrogen Bonded Copper (II) Coordination Network Constructed by the Combination of Flexible and Rigid Ligands

Complex [Cu(2,2′‐bipy)(H₂L¹)] (ClO₄)₂(1) has been synthesized by the self‐assembly of Cu(ClO₄)₂ with a rigid ligand 2,2′‐bipyridine and a flexible potential tetradentate ligand N, N'‐bis(hydroxyethyl)ethylenediamine (H₂L¹). Crystal analyses reveal that the potentially tetradentate ligand H₂L¹ acts in a tridentate mode by the coordination of one hydroxyl oxygen atom and two amino nitrogen atoms. The Cu(II) atom coordinates additionally with two bipyridyl nitrogen atoms, giving a distorted square pyramidal geometry. Each complex molecule is connected with four surrounding molecules along the ac plane by multiple hydrogen bonds, leading to 2D sheets constituted with 0.7874 nm × 1.0891 nm metallomacrocyclic rectangles. Each vertex of the rectangle is occupied by a copper atom, and the four sides are comprised of multiple hydrogen bonds.