Self-assembled tetrameric H2O clusters in the crystal lattice of [Cu(μ2-OH){Ph2P(O)NP(O)Ph2-κ1O,O′}(1,10-phen-κ2N,N′)]2•2H2O

The synthesis and characterization of the dinuclear Cu(II) complex [Cu(mu(2)-OH){Ph2P(O)NP(O)Ph-2-kappa O-1,O '}(1,10-phen-kappa N-2,N ')](2)center dot 2H(2)O (1), 1,10-phen = 1,10-phenanthroline, is described. X-ray crystallographic studies reveal that the Cu(II) centers of 1 are bridged by two OH- groups and are coordinated by the (O,O) = Ph2P(O)NP(O)Ph-2(-) ligand in a monodentate fashion, unprecedented for Cu(II). The crystal lattice of 1 also contains H2O molecules, which are involved in the formation of a hydrogen bonding network with bridging OH- groups and noncoordinated O atoms of the (O,O) ligand. These H2O molecules are arranged in the crystal lattice of 1 as tetrameric clusters. The packing of molecules in the structure of 1 was investigated by Hirshfeld Surface analysis.