Synthesis, spectroscopic characterization, and crystal structure of Co(III), Ni(II) and Cu(II) complexes with Schiff bases derived from salicylaldehyde (original) (raw)
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Polyhedron, 2002
A series of complexes of the type M(Phca 2 en)X 2 , where Phca 2 en0/N ,N ?-bis(b-phenyl-cinnamaldehyde)-1,2-diiminoethane, M(II) 0/Co, Ni or Zn and X 0/Cl, Br, I or NCS have been synthesized and characterized. The crystal and molecular structures of Co(Phca 2 en)Cl 2 (2), Ni(Phca 2 en)Br 2 (5) and Zn(Phca 2 en)Cl 2 (6) were determined by X-ray crystallography from single-crystal data. Complexes 2 and 5 are isomorph and isostructure, in which the coordination polyhedron about the central metal ion is distorted tetrahedron with ClÃ/CoÃ/Cl, 110.17(6)8; NÃ/Co Ã/N, 84.16(13)8 and ClÃ/Zn Ã/Cl, 112.02(6)8; NÃ/ZnÃ/N, 83.45(16)8. The complex 5 crystallizes in triclinic system with two molecules per asymmetric unit, both having nickel ion in distorted tetrahedral geometry, Br Ã/ Ni Ã/Br, 122.645(18)8 and 125.729(18)8; NÃ/Ni Ã/N, 84.63(9)8 and 85.08(9)8. These structures consist of intermolecular hydrogen bonds of the type C Ã/HÁ Á ÁX. The formation of the C Ã/HÁ Á ÁM weak intramolecular hydrogen bonds due to the trapping of CÃ/H bonds in the vicinity of the metal atoms are reported for 2, 5 and 6. A 1 H NMR study of Zn complexes gives further evidence for the presence of such interactions and their significance. The spectral properties of the above complexes are also discussed. #
Co(II), Ni(II) and Cu(II) metal complexes with a N 8 azamacrocyclic ligand
Polyhedron, 2006
Hydrated nitrate and perchlorate salts of the transitional metal ions Co2+, Ni2+ and Cu2+ have been used to investigate the coordination capability of the octaaza macrocycle L derived from 2,6-diformylpyridine and diethylenetriamine. The synthesis of the metal complexes was carried out in 1:1 and 2:1 metal:ligand molar ratios, but dinuclear complexes were obtained in all cases due to the size of the 24-membered ligand. The complexes have been characterized by elemental analysis, molar conductivity, mass spectrometry, IR spectroscopy, diffuse reflectance and magnetic measurements. The dinuclear nature of the compounds was confirmed by X-ray diffraction. The crystal structures of [Ni2L(NO3)2](NO3)2, [Cu2L(NO3)4] and [Cu2L(ClO4)4], were determined.Hydrated nitrate and perchlorate salts of the transitional metal ions Co2+, Ni2+ and Cu2+ have been used to investigate the coordination capability of the octaaza macrocycle L derived from 2,6-diformylpyridine and diethylenetriamine. The synthesis of the metal complexes was carried out in 1:1 and 2:1 metal:ligand molar ratios, but dinuclear complexes were obtained in all cases. The complexes have been characterized by elemental analysis, molar conductivity, mass spectrometry, IR spectroscopy, diffuse reflectance and magnetic measurements. The crystal structures of [Ni2L(NO3)2](NO3)2, [Cu2L(NO3)4] and [Cu2L(ClO4)4] have been determined.
Journal of Coordination Chemistry, 2003
The title complex [Co III {(naph) 2 dpt}(bzlan)]BPh 4 , where (naph) 2 dpt stands for bis-(2-hydroxy-1-naphthaldimine)-N-dipropylenetriamine dianion and bzlan for benzylamine, has been synthesized and characterized by elemental analyses, IR, UV-Vis and 1 H NMR spectroscopy. The structures of two possibly concomitant polymorphs, obtained from methanolic solution, [polymorph I (monoclinic, centrosymmetric, red-brown, thickish prismatic platelets) and polymorph II (orthorhombic, noncentrosymmetric, ochre olive-green, thin laths)] have been determined by X-ray crystallography. The geometry around the central cobalt ion is distorted octahedral in both polymorphs, but the benzylamine shows different kinds of orientation and disorder.
Two New Schiff Base Ni II and Cu II Complexes: Synthesis and Structures
Journal of the Chilean Chemical Society, 2013
Schiff base ligands 2-bromo-4-chloro-6-[(2-piperidin-1-ylethylimino)methyl]phenol (BCP) and 2,4-dibromo-6-[(2-morpholin-4-ylethylimino)methyl]phenol (DBP) and their nickel(II) and copper(II) complexes [Ni(BCP) 2 (CH 3 OH) 2 ]•2NO 3 (1) and [Cu(DBP) 2 ] (2), have been prepared and characterized by elemental analyses, IR, and single crystal X-ray crystallographic determination. The crystal of (1) is orthorhombic: space group Pbcn, a = 23.894(1), b = 8.244(2), c = 19.900(2) Å, V = 3919.9(10) Å 3 , Z = 4. The crystal of (2) is monoclinic: space group P2 1 /c, a = 7.072(2), b = 15.426(3), c = 14.214(3) Å, β = 96.718(2)°, V = 1540.0(7) Å 3 , Z = 2. The Schiff bases coordinate to the metal atoms through the phenolate O and imine N atoms. The Ni atom in (1) is in an octahedral coordination, and the Cu atom in (2) is in a square planar coordination.
Polyhedron, 2006
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Crystallography Reports, 2008
The crystal structures of {4-bromo-2-[(2-hydroxyethylimino)-methyl]phenolo}aquacopper(II) nitrate hemihydrate (I), chloro-{4-bromo-2-[(2-hydroxyethylimino)-methyl]phenolo}copper hemihydrate (II), and chloro-{4-bromo-2-[(2-hydroxyethylimino)-methyl]phenolo}aquanickel (III) are determined using X-ray diffraction. Crystals of compound I are formed by cationic complexes, nitrate ions, and solvate water molecules. In the cation, the copper atom coordinates the singly deprotonated molecule of tridentate azomethine and the water molecule. The copper complexes are joined into centrosymmetric dimers by the O w-H ••• O hydrogen bonds. The crystal structure of compound II is composed of binuclear copper complexes and solvate water molecules. The copper atom coordinates the O,N,O ligand molecule and the chlorine ion, which fulfills a bridging function. The coordination polyhedron of the metal atom is a distorted tetragonal bipyramid in which the vertex is occupied by the chlorine atom of the neighboring complex in the dimer. Compound III is a centrosymmetric dimer complex. The coordination polyhedra of two nickel atoms related via the inversion center are distorted octahedra shared by the edge.
Mediterranean Journal of Chemistry
The new title binuclear Ni (II) compound (1) and the novel pentanuclear Ni (II) cluster {[ } (2) are formed from the reaction of an asymmetric Schiff base ligand L (L = 4-(salicylaldiminato)antipyrine) with Ni .4 in the former or Ni(ClO 4) 2 .6H 2 O in presence of malonate in the later. Complex (1) consists of (] + cation) and one uncoordinated tetraphenylborate anion. The cation adopts a distorted octahedral arrangement around each metal center. In the binuclear unit both Ni(II) ions are linked through two phenolate (µ 2-O) oxygen atoms of L, and two oxygen atoms of a bridging carboxylate group. Each Ni (II) coordinates to four oxygen atoms at the basal plane, two oxygen atoms from two bridging phenolate groups, one from pyrazolone ring and the last of an aqua molecule, and at the axial positions to a bridging carboxylate-O atom and an azomethine nitrogen atom. In the pentanuclear cluster (2) consisting of [ ] +2 cation and two tetraphenylborate anions, the core of the cation is assembled by four [Ni()] units, linked to the central Niion by two bridging water molecules. The resulting coordination sphere for the external symmetry related nickel ions is a pseudo octahedron. The central Ni-atom unusually adopts dodecahedron geometry through its coordination to eight bridging water molecules. In complex (1) each Ni-atom is coordinated to one tridentate L ligand and in complex (2) each [Ni ()] unit is coordinated to two bidentate L ligands. Inter-and intramolecular hydrogen bonds are present in both crystal structures.
Zenodo (CERN European Organization for Nuclear Research), 2018
The complexes of cobalt(II), nickel(II) and copper(II) of the types [(sb) 2 M.2H 2 O] [where M = Co II , Ni II and Cu II ], [sbH = sapH, napH], [(Cl)Cu(sb)] and [Cu(sb) 2 ] [sb = sapH, smabH] have been prepared by using simple metathetic reactions. The structural characterization of the complexes, synthesized during the present course of investigations have been elucidated by elemental analysis (C, H, N, Cl and Cu), IR, electronic spectral data, ESR, FAB-MS and magnetic studies. Thermogravimetric studies have also been carried out for some of the hydrated metal complexes.