Synthesis, crystal structure and Hirshfeld surface analysis of [Cu(H )(μ-Cl)CuCl]·HO [H = 2-hy-droxy-'-(propan-2-yl-idene)benzohydrazide].

The present study focuses on the synthesis and structural characterization of a novel dinuclear Cu complex, [tri-chlorido-copper(II)]-μ-chlorido-{bis-[2-hy-droxy-'-(propan-2-yl-idene)benzohydrazide]copper(II)} monohydrate, [CuCl(CHNO)]·HO or [Cu(H )(μ-Cl)CuCl]·HO [H = 2-hy-droxy-'-(propan-2-yl-idene)benzohydrazide]. The complex crystallizes in the monoclinic space group 2/ with one mol-ecule of water, which forms inter-actions with the ligands. The first copper ion is penta-coordinated to two benzohydrazine-derived ligands two nitro-gen and two oxygen atoms, and one bridging chloride, which is also coordinated by the second copper ion alongside three terminal chlorines in a distorted tetra-hedral geometry.

Synthesis, crystal structure and Hirshfeld surface analysis of aqua-(3-meth-oxy-cinnamato-κ)bis-(1,10-phenanthroline-κ ,')cobalt(II) nitrate.

The title compound, [Co(CHO)(CHN)(HO)]NO (I), crystallizes in the triclinic space group with a monomeric [Co(3-meo-cin)(phen)(HO)] cation and a nitrate anion (3-meo-cin = 3-meth-oxy cinnamic acid) in the asymmetric unit. The Co ion is coordinated by four N atoms from two 1,10-phenanthroline ligands and two O atoms, the first from a meth-oxy cinnamate ligand and the second from a coordinated water mol-ecule, forming a distorted octa-hedral geometry. Discrete entities of the cation and nitrate anion are formed by water-nitrate O-H⋯O and phen-nitrate C-H⋯O hydrogen bonds.

Synthesis, structure and magnetic properties of a series of dinuclear heteroleptic Zn/Ln Schiff base complexes: effect of lanthanide ions on the slow relaxation of magnetization.

We report an investigation on the synthesis, structure and magnetic properties of a series of heteroleptic Zn/Ln complexes of the general formula [ZnLClLn(o-van)(HO)(NO)]·HO (HL = N,N'-bis(3-methoxysalicylidene)-1,2-diaminoethane; o-van = o-vanillinate; Ln = Tb (1), Dy (2), Er (3)). All the compounds exhibit a slow relaxation of their magnetization and the dysprosium analogue shows one of the highest anisotropic barriers for ZnDy complexes.

Synthesis, structure and magnetic investigations of dinuclear lanthanide complexes based on 2-ethoxycinnamate.

A series of dinuclear lanthanide complexes incorporating the 2-ethoxycinnamate ligand have been synthesized and characterized using elemental analyses, infra-red spectroscopy, X-ray diffraction and magnetic measurements. Depending on the nature of the lanthanide ion, three different isostructural series of respective formulas, [Ln(L)3(DMSO)(H2O)]2 (Ln = Ce (1), Nd (2)), [Ln(L)3(DMSO)x(DMF)y(H2O)]2 (Ln = Gd (3), Dy (5) and Er (6)) and [Tb(L)3(DMF)(H2O)]2 (4) have been obtained. Investigations of their magnetic properties reveal a genuine single-molecule magnet behaviour observed for the dysprosium based compound 5, while a field-induced slow relaxation of the magnetization is found for compounds 1, 2 and 3.

A luminescent Schiff-base heterotrinuclear ZnDy single-molecule magnet with an axial crystal field.

We report here the synthesis and investigation into the magnetic properties of a luminescent trinuclear ZnDy Schiff-base complex that exhibits a zero-field single-molecule magnet behaviour. Magneto-structural correlation confirms that the axial crystal-field is generated by the phenoxide moieties while the characteristic Dy-based luminescence is observed.

Cinnamic acid derivative rare-earth dinuclear complexes and one-dimensional architectures: synthesis, characterization and magnetic properties.

Discrete and extended architectures based on the association of lanthanide ions with two derivatives of cinnamic acid (2-methoxycinnamic acid and 3-methoxycinnamic acid) have been synthesized and characterized by IR spectroscopy, elemental analyses, X-ray diffraction and magnetic measurements. The use of the 2-methoxycinnamic ligand enables the synthesis of a series of dinuclear complexes (Ce (1), Nd (2), Gd (3), Dy (4)), while the presence of 3-methoxycinnamic acid induces the formation of one-dimensional coordination polymers (Ce (5), Nd (6), Dy (7)). Investigations of the magnetic properties of the complexes reveal that they all exhibit field-induced slow relaxation of the magnetisation, mainly induced by Raman and direct relaxation processes.

Bis(2,2'-bipyridyl-κ(2) N,N')chloridonickel(II) nitrate trihydrate.

In the title hydrated salt, [NiCl(C10H8N2)2](NO3)·3H2O, the Ni(2+) 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)°.

Poly[[diaqua-bis-(μ2-4,4'-bipyrid-yl)cobalt(II)] dinitrate tetra-hydrate].

The title compound, {[Co(C10H8N2)2(H2O)2](NO3)2·4H2O} n , (C10H8N2 = 4,4'-bipyridine = 4,4'-bpy) is a layered coordination polymer built up from a cationic square grid extending in (101) enclosing uncoordinating nitrate ions and water mol-ecules. The Co(II) ion has site symmetry 2 and one of the 4,4'-bpy ligands is generated by twofold symmetry [two N atoms and two C atoms lie on the rotation axis and the dihedral angle between the pyridine rings is 45.66 (5)°].

Bis(acetyl-acetonato-κ(2)O,O')bis-(pyridine-κN)nickel(II) dihydrate.

The title compound, [Ni(C(5)H(7)O(2))(2)(C(5)H(5)N)(2)]·2H(2)O, crystallizes with two half-mol-ecules in the asymmetric unit. The Ni(II) ion of each unique complex mol-ecule lies on an inversion centre and has an octa-hedral coordination geometry. The crystal structure features weak O-H⋯O hydrogen bonds, which form chains running parallel to the a axis.

Bis[2-(5-methyl-sulfanyl-1,3,4-oxadiazol-2-yl-κN(3))phenolato-κO(1)]copper(II).

In the title complex, [Cu(C(9)H(7)N(2)O(2)S)(2)], the Cu(II) ion, located on an inversion center, adopts an N(2)O(2) square-planar coord-ination. The 2-(5-methyl-sulfanyl-1,3,4-oxadiazol-2-yl)phenolate ligand is chelated to the central Cu(II) ion in an N,O-bidentate manner.

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(C(10)H(9.5)N(2)O(2)S(2))(2)(H(2)O)], is a mol-ecular sodium complex with N'-(1,3-dithio-lan-2-yl)-2-hy-droxy-benzohydrazide ligands with the negative charge spread evenly over both, and a water mol-ecule. The Na(I) ion coordination is distorted trigonal-bipyramidal, formed by two N and three O atoms, with the Na(I) ion lying on a twofold rotation axis.

Very strong ferromagnetic interaction in a new binuclear mu-methoxo-bridged Mn(III) complex: synthesis, crystal structure, magnetic properties, and DFT calculations.

New mononuclear [Mn(HL)3].2CHCl3 (H2L = 2-salicyloylhydrazono-1,3-dithiolane) and binuclear Mn2(mu-OCH3)2(HL)4 manganese (III) complexes have been synthesized and structurally characterized. The binuclear complex, described in this communication, displays very strong intramolecular ferromagnetic coupling (J = + 19.