Abdurrahman Sengul

trans-Di­aqua­bis(6-hydroxy­picolinato-κ2N,O2)copper(II)

In the title compound, [Cu(C 6 H 4 NO 3 ) 2 (H 2 O) 2 ], the Cu II ion lies on an inversion centre and has an elongated octahedral environment, equatorially trans-coordinated by two N,O-bidentate picolinate ligands and axially coordinated by two water O atoms. The complex molecules form layers, which are linked by O-H...O hydrogen bonds between the aqua ligands and neighbouring carboxylate groups. An intramolecular hydrogen bond between the coordinated carboxylate O atom and the hydroxy H atom is also observed.

Spectroscopic and structural studies of 6,6′-bis(N-methylhydrazine)-2,2′-bipyridine and its mononuclear copper(II) complex

The tetradentate ligand, 6,6′-bis(N-methylhydrazine)-2,2′-bipyridine (L) and its mononuclear copper(II) complex [Cu(L)](ClO4)2] (1) have been synthesized and characterized. The crystal structures of L and 1 have been determined by single-crystal X-ray diffraction. Both crystallize in the centrosymmetric monoclinic space group with crystallographic inversion symmetry. The ligand adopts a planar transoid configuration in the solid state. In 1, the Cu(II) is six-coordinate octahedral, defined by N4O2 donors from ligand and two perchlorates. The molecular units are connected by intermolecular H-bonds between the hydrazino group of the one unit and coordinated perchlorate of the neighboring two units via N–H ··· O to furnish a 2-D network. Coordinated perchlorates also form an intramolecular H-bond with hydrazine influencing the crystal packing.

1-[6-(6-Acetyl­pyridin-2-yl)pyridin-2-yl]ethanone

In the title compound, C14H12N2O2, the asymmetric unit comprises one half-molecule with an inversion center between the pyridine rings. The rings are trans coplanar with the acetyl groups deviating slightly from the mean planes, making a dihedral angle of 4.63 (4)°. In the crystal, molecules are linked by weak intermolecular C—H⋯O hydrogen bonds, forming a supramolecular sheet parallel to (100).

{N,N′-Bis[1-(2-pyrid­yl)ethyl­idene]ethane-1,2-diamine-κ4N,N′,N′′,N′′′}bis­(trifluoro­methane­sulfanato-κO)copper(II)

A discrete neutral CuII complex, [Cu(CF3SO3)2(C16H18N4)], has been derived from the symmetrical tetradentate Schiff base, N,N′-bis[1-(pyridin-2-yl)ethylidene]ethane-1,2-diamine. The copper centre assumes a tetragonally distorted pseudo-octahedral geometry with the O atoms of two trifluoromethanesulfonate anions coordinated weakly in the axial positions. The Cu—N distances lie in the range 1.941 (3)–2.011 (3) Å and the Cu—O distances are 2.474 (3) and 2.564 (3) Å.

N,N'-bis[1-(pyrazin-2-yl)ethylidene]hydrazine.

Molecules of the title compound, C12H12N6, contain both a diimine linkage and an N-N bond, and assume a planar structure. The compound lies about an inversion centre and there are three intramolecular C-H...N hydrogen bonds.