Chlorido[N′-(2-oxidobenzil­idene)acetohydrazide-κ2 O,N′,O′]copper(II) dihydrate

In the title complex, [Cu(C9H9N2O2)Cl]·2H2O, prepared from the Schiff base ligand N′-(2-hydroxy­benzil­idene)aceto­hydrazide and copper(II) chloride, the CuII atom is coord­inated by two O atoms and one N atom from the ligand and by a Cl atom in a distorted square-planar geometry. The two donor O atoms of the tridentate Schiff base ligand are in a trans arrangement. In the crystal structure, there is an extensive inter­molecular hydrogen-bonding network; N—H⋯O, O—H⋯O and O—H⋯Cl inter­actions, involving the uncoordinated water mol­ecules, lead to the formation of a two-dimensional network parallel to the ab plane

Bis{2-amino-2-oxo-N-[(1E)-1-(pyridin-2-yl-κN)ethyl­idene]acetohydrazidato-κ2 N′,O 1}nickel(II)

In the title compound, [Ni(C9H9N4O2)2], the NiII ion is situated on a twofold rotation axis and is coordinated by two O and four N atoms from two tridentate {2-amino-2-oxo-N-[(1E)-1-(pyridin-2-yl-κN)ethyl­idene]acetohydrazidate ligands in a distorted octa­hedral geometry. In the crystal, N—H⋯O and N—H⋯N hydrogen bonds link the mol­ecules into columns in [001]. The porous crystal packing is further stabilized via π–π inter­actions between the pyridine rings of neighbouring mol­ecules [centroid–centroid distance = 3.746 (3) Å] with voids of 270 Å3

{μ-N,N′-Bis[1-(2-pyridyl)ethylidene]benzene-1,2-diamine}di-μ-chlorido-bis[diaquanickel(II)] dichloride ethanol disolvate

In the title compound, [Ni2Cl2(C20H18N4)(H2O)4]Cl2·2C2H6O, the coordination environment of each Ni2+ ion is distorted octa­hedral formed by two N atoms from the Schiff base ligand, two O atoms from water mol­ecules and two chloride anions acting as μ2 bridges between the metal ions. The coordinated water mol­ecules are linked to the uncoordinated ethanol mol­ecules and chloride anions by O—H⋯O and O—H⋯Cl hydrogen bonds, although the assignment of some of these is tentative. A weak inter­molecular O—H⋯N inter­action within the ligand is also observed

Synthesis and spectroscopic study of transition metal complexes of tridentate ligand formed by direct condensation of o-vanillin and 2-aminophenol: X-ray structural characterization of the zinc(II) complex

The reactions of the Schiff base 2-((2-hydroxyphenylimino)methyl)-6-methoxyphenol (H2L), obtained by direct condensation of 2-aminophenol and 2-hydroxy-3-methoxybenzaldehyde, with some transition  metal ions (Mn(II), Co(II), Ni(II), Cu(II) and Zn(II)) afforded complexes of general formulae [M2(L)2(solvent)x] (M: Mn, Co, Ni, Cu or Zn; Solvent: DMSO or H2O). These compounds were characterized by elemental analysis, UV-Vis, IR, 1H- and 13C-NMR spectroscopies, molar conductivity and room temperature magnetic measurements. The structure of zinc(II) complex has been determined by X-ray crystallography. Crystal data for C32H34N2O8S2Zn2 (M =769.47 g/mol): Orthorhombic, space group Pbca (no. 61), a = 16.3176(7) Å, b = 9.1247(3) Å, c = 21.8274(10) Å, V = 3250.0(2) Å3, Z = 4, T = 173(2) K, μ(MoKα) = 1.658 mm-1, Dcalc = 1.573 g/cm3, 28116 reflections measured (4.5° ≤ 2Θ ≤ 60.3°), 4457 unique (Rint = 0.0409, Rsigma = 0.0371) which were used in all calculations. The final R1 was 0.0307(0.0466) and wR2 was 0.0649 (0.0701) (all data). The coordination sphere of the Zn center is best described as a trigonal bipyramid

The cocrystal μ-oxalato-κ4O1,O2:O1′,O2′-bis(aqua(nitrato-κO){[1-(2-pyridyl-κN)ethylidene]hydrazine-κN}copper(II)) μ-oxalato-κ4O1,O2:O1′,O2′-bis((methanol-κO)(nitrato-κO){[1-(2-pyridyl-κN)ethylidene]hydrazine-κN}copper(II)) (1/1)

The title cocrystal, [Cu2(C2O4)(NO3)2(C7H9N3)2(H2O)2][Cu2(C2O4)(NO3)2(C7H9N3)2(CH4O)2], is a 1:1 cocrystal of two centrosymmetric CuII complexes with oxalate dianions and Schiff base ligands. In each molecule, the CuII centre is in a distorted octahedral cis-CuN2O4 environment, the donor atoms of the N,N′-bidentate Schiff base ligand and the bridging O,O′-bidentate oxalate group lying in the equatorial plane. In one molecule, a monodentate nitrate anion and a water molecule occupy the axial sites, and in the other, a monodentate nitrate anion and a methanol molecule occupy these sites. In the crystal structure, intermolecular N—H...O, O—H...O and N—H...N hydrogen bonds link the molecules into a network. Weak intramolecular N—H...O interactions are also observed

Synthesis, spectroscopic characterization, and crystal structures of Schiff bases derived from nicotinic hydrazide

International audienceTwo Schiff bases were prepared from nicotinic hydrazide and o-vanillin (H2L 1) (1) or salicylaldehyde (H2L 2) (3) and were characterized by elemental analysis, 1 H and 13 C NMR and IR spectroscopic studies. Compound were protonated in ethanol-nitric acid solution and gave compound [(H3L 1). (NO3)] (2). The compound (2) crystallizes in the monoclinic space group P21/c with unit cell dimensions a = 7.2005 (3) Å, b = 8.8914 (4) Å, c = 22.6392 (9) Å, = 96.753 (2)°, V = 1439.36 (11) Å3, Z = 4, R1 = 0.059 and wR2 = 0.037. The compound (3) crystallizes in the monoclinic space group P21/c with unit cell dimensions a = 26.615 (4) Å, b = 11.3366 (14) Å, c = 8.1903 (9) Å, = 98.814 (3)°, V = 2442.0 (5) Å3, Z = 8, R1 = 0.085 and wR2 = 0.141. Both molecules present inter and intramolecular hydrogen bonds which consolidate the structures in three-dimensional networks

Synthesis, spectroscopic studies and X-ray structure determination of two mononuclear copper complexes derived from the Schiff base ligand N,N-dimethyl-N'-((5-methyl-1H-imidazol-4-yl)methylene)ethane-1,2-diamine

Reactions of the Schiff base N,N-dimethyl-N'-((5-methyl-1H-imidazol-4-yl)methylene) ethane-1,2-diamine (HL), synthesised in situ, with chloride or thiocyanate copper (II) salt; afforded two new mononuclear complexes, [Cu(HL)Cl2]·H2O (1) and [Cu(HL)(SCN)2] (2). These compounds have been studied and characterized by elemental analysis, IR and UV-Vis spectroscopies, electrochemistry, molar conductivity and room temperature magnetic measurements. Single crystal X-ray structure determination of the complexes revealed the presence of neutral moieties in the asymmetric unit. The mononuclear (1) crystallises in the monoclinic space group P21/c with the following unit cell parameters a = 7.4355(3) Å, b = 7.2952(3) Å, c = 26.2729(11) Å, β = 93.461(4)°, V = 1422.52(10) Å3, Z = 4, R1 = 0.033 and wR2 = 0.082 and the mononuclear complex (2) crystallises in the monoclinic space group C2/c with the following unit cell parameters a = 26.2578(7) Å, b = 7.4334(2) Å, c = 16.6237(5) Å, β = 99.089(3)°, V = 3203.95(16) Å3, Z = 8, R1 = 0.037 and wR2 = 0.104. In both complexes the ligand acts in tridentate fashion and the coordination environment of the copper atom can be described as distorted square pyramidal. The crystal lattice of the complex 1 is stabilized by electrostatic forces of attraction and O–H···Cl, C–H···O, N–H···Cl, and C–H···Cl, hydrogen bonding interactions while the crystal lattice of the complex 2 is stabilized by N–H···S and C–H···N

<b>Preparation, spectroscopic studies and X-ray structure of homobinuclear lanthanide(III) complexes derived from 2,6-diformyl-4-chlorophénol-bis-(2’-hydroxy-benzoylhydrazone)</b>

Reaction of the 2,6-diformyl-4-chlorophenol-bis-(2'-hydroxy-benzoylhydrazone) with Ln(NO3)3.nH2O (n = 5 or 6 and Ln = Y, La, Ce, Pr, Nd, Sm, Gd, Dy, Er and Yb) produces homobinuclear complexes. These complexes have been characterized by analysis, molar conductance, magnetic measurements, infrared spectral studies and X-ray diffraction. The analytical data showed 1:3 (metal:ligand) stoichiometry. Molar conductance measurements in dmf indicate 1:3 electrolytes in all cases. Magnetic moment values are close proximity of the Van Vleck values. IR studies suggest the coordination of the ligand is through the azomethine, the phenolic oxygen atom and the carbonyl oxygen of the hydrazonic moiety. The nitrate ion is also found to be ionic in all the complexes. An X-ray structure determination of [C66H48N12O15Cl3Er2]Cl2NO3.5H2O confirms the conclusion from the spectroscopic studies and show that the erbium is at the centre of a tricapped trigonal prism with coordination number nine. In all the complexes the lanthanide ions have substantially similar coordination

Aqua{2-(pyridin-2-yl)-N-[(pyridin-2-yl)methylidene]ethanamine-&#954;3N,N&#8242;,N&#8242;&#8242;}(sulfato-&#954;2O,O&#8242;)copper(II) tetrahydrate

The title complex, [Cu(SO4)(C13H13N3)(H2O)]&#183;4H2O, was obtained by mixing copper sulfate pentahydrate and 2-(pyridin-2-yl)-N-(pyridin-2-ylmethylidene)ethanamine in ethanol under reflux conditions. The CuII ion shows a Jahn&#8211;Teller-distorted octahedral geometry, with equatorial positions occupied by three N atoms from the tridentate ligand (average Cu&#8212;N = 2.004&#8197;&#197;) and one O atom from a bidentate sulfate anion [Cu&#8212;O = 1.963&#8197;(2)&#8197;&#197;]. The axial positions are occupied by one O atom from a coordinating water molecule [Cu&#8212;O = 2.230&#8197;(3)&#8197;&#197;] and one weakly bonded O atom [Cu&#8212;O = 2.750&#8197;(2)&#8197;&#197;] from the bidentate sulfate ion. The complex molecules are connected through O&#8212;H...O hydrogen bonds between the coordinating water molecules and sulfate ions from neighboring complexes, forming a double chain parallel to the c axis. The chains are stabilized through additional hydrogen bonds by one of the non-coordinating water molecules bridging between neighboring strands of the double chains. The remaining three water molecules fill the interstitial space between the double chains and are involved in an intricate hydrogen-bonding network that consolidates the structure