Chahrazed Beghidja

Synthesis, crystal structure and magnetic properties of a new mixed-valence [Mn4IIIMnII] pentanuclear complex

A novel pentanuclear mixed-valence manganese (II/III) complex [Mn5Na2O2(O2CMe)4(L′)4(DMF)4(H2O)]·3DMF (where H2L′ = 2-hydroxyphenyl-1,3,4-oxadiazole-2(3H)-thione) has been synthesized, structurally and magnetically characterized and presents a butterfly-type spin topology with competing antiferromagnetic interactions.

Bis(2,2′-bipyridyl-κ2N,N′)chloridonickel(II) nitrate trihydrate

In the title hydrated salt, [NiCl(C10H8N2)2](NO3)·3H2O, the Ni2+ ion is coordinated by two 2,2′-bipyridyl (2,2′-bpy) ligands and a chloride ion in a trigonal–bipyramidal geometry. The chloride ion occupies an equatorial site and the dihedral angle between the 2,2′-bpy ring systems is 72.02 (6)°. In the crystal, the components are linked by C—H⋯O and O—H⋯O hydrogen bonds and aromatic π–π stacking interactions [shortest centroid–centroid separation = 3.635 (2) Å], generating a three-dimensional network.

Bis(acetyl­acetonato-κ2O,O′)bis­(pyridine-κN)nickel(II) dihydrate

The title compound, [Ni(C5H7O2)2(C5H5N)2]·2H2O, crystallizes with two half-molecules in the asymmetric unit. The NiII ion of each unique complex molecule lies on an inversion centre and has an octahedral coordination geometry. The crystal structure features weak O—H⋯O hydrogen bonds, which form chains running parallel to the a axis.

Aqua-bis-[N'-(1,3-dithio-lan-2-ylidene)-2-hy-droxy-benzohydrazidato(0.5-)-κ(2)N',O]sodium(I).

The title compound, [Na(C10H9.5N2O2S2)2(H2O)], is a molecular sodium complex with N′-(1,3-dithiolan-2-yl)-2-hydroxybenzohydrazide ligands with the negative charge spread evenly over both, and a water molecule. The NaI ion coordination is distorted trigonal–bipyramidal, formed by two N and three O atoms, with the NaI ion lying on a twofold rotation axis. Intramolecular N—H⋯O hydrogen bonds occur. Molecules pack as discrete units and the crystal packing is stabilized by strong O—H⋯O hydrogen bonds, which give rise to chains along [010]; the chains are interlinked by strong O—H⋯O hydrogen bonds.

Bis[2-(5-methyl­sulfanyl-1,3,4-oxadiazol-2-yl-κN3)phenolato-κO1]copper(II)

In the title complex, [Cu(C9H7N2O2S)2], the CuII ion, located on an inversion center, adopts an N2O2 square-planar coordination. The 2-(5-methylsulfanyl-1,3,4-oxadiazol-2-yl)phenolate ligand is chelated to the central CuII ion in an N,O-bidentate manner.