Tetra-nuclear copper(II) complex of 2-hydroxy-N,N'-bis-[1-(2-hy-droxy-phen-yl)ethyl-idene]-propane-1,3-di-amine.

The title mol-ecular structure, namely, (µ3-acetato)(µ2-acetato)-bis-(µ3-1,3-bis-{[1-(2-oxidophen-yl)ethyl-idene]amino}-propan-2-olato)tetra-copper(II) monohydrate, [Cu4(C19H19N2O3)2(CH3CO2)2]·H2O, corresponds to a non-symmetric tetra-nuclear copper complex. The complex exhibits one ligand mol-ecule that connects two copper CuII metal centres via its ethano-lato oxygen anion acting in a µ2-mode and one ligand mol-ecule that connects three copper CuII metal centres via its ethano-lato oxygen anion acting in a µ3-mode. One bridging acetate group acting in an η1:η1-µ2-mode connects two copper(II) ions while another bridging acetate group connects three copper(II) ions in an η1:-η2-µ3-mode. A chair-like Cu3O3 structure is generated in which the two CuO4N units are connected by one µ2-O ethano-late oxygen atom. These two units are connected respectively to the CuO3N unit via one µ3-O ethano-late oxygen atom and one µ2-O atom from an acetate group. The µ3-O atom also connects one of the CuO4N units and the CuO3N unit to another CuO3N unit, which is out of the chair-like structure. Each of the two penta-coordinated CuII cations has a distorted NO4 square-pyramidal environment. The geometry of each of the two CuNO3 units is best described as a slightly square-planar environment. A series of intra-molecular O-H⋯O hydrogen bonds is observed. In the crystal, the units are connected by inter-molecular C-H⋯O and O-H⋯O hydrogen bonds, thus forming sheets parallel to the ac plane.

Dichlorido{N'-[phen-yl(pyridin-2-yl-κN)methyl-idene]isonicotinohydrazide-κ(2)N',O}zinc.

The title compound, [ZnCl(2)(C(18)H(14)N(4)O)], crystallizes with two mol-ecules in the asymmetric unit, which differ in the tautomeric (neutral and zwitterionic) forms of the coordin-ating organic ligand. In both mol-ecules, the Zn(II) atom adopts a distorted square-pyramidal geometry by two N and one O atoms of the Schiff base ligand and two Cl atoms acting as monodentate chloride anions. The crystal packing is stabilized by N-H⋯N and N-H⋯Cl hydrogen bonds, forming a two-dimensional network parallel to the ac plane.

Dichlorido[2-(pyridin-2-yl)-N-(pyridin-2-yl-methyl-idene)ethanamine-κ(3)N,N',N'']manganese(II) monohydrate.

In the title complex, [MnCl(2)(C(13)H(13)N(3))]·H(2)O, the Mn(II) atom is in a distorted square-pyramidal environment, with an Addison τ parameter of 0.037. The coordination geometry is defined by three N-atom donors from the tridentate 2-(pyridin-2-yl)-N-(pyridin-2-yl-methyl-idene)ethanamine ligand and two terminal Cl atoms. Although the H atoms of the lattice water molecule were not located, O⋯O distances of 3.103 (7) Šand O⋯Cl distances of 3.240 (3) and 3.482 (4) Šsuggest that hydrogen bonding is responsible for the stabilization of the crystal packing.

(2-{[2-(2-Amino-ethyl-amino)-ethyl-imino]-meth-yl}phenolato-κO,N',N'',N''')copper(II) perchlorate.

The asymmetric unit of the title complex, [Cu(C(11)H(16)N(3)O)]ClO(4), consists of two Cu(II) ions coordinated by Schiff base ligands and two perchlorate anions. The Schiff base mol-ecules are linked to the Cu(II) atoms via three N atoms and one O atom, resulting in a square-planar geometry. Inter-molecular hydrogen bonds involving the NH groups as donors and O atoms of the perchlorate anions as acceptors are observed.