Structures and properties of zinc(II) complexes of NN-bis[(2-hydroxy-5-X-phenyl)phenylmethylene]-4-azaheptane-1,7-diamine (X = chloro or methyl): comparison of d 10, d 9, and d 8 analogues

Freyberg, Derek P.; Mockler, Gary M.; Sinn, E.

doi:10.1039/dt9760000447

Cited by 59 publications

(45 citation statements)

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“…Pentacoordination is fairly common among Zn(II) complexes [9]. A distorted trigonal bipyramid has been reported as the coordination polyhedron in the structures of a number of complexes with large organic ligands [10,11]. The coordination mode and the geometry of Zn(II) complex molecules results from such factors as lattice forces produced by specific modes of molecular packing in the crystal, the steric effects due to the size and shape of the ligand molecules and the mutual repulsion of electronegative donor atoms.…”

Section: Resultsmentioning

confidence: 99%

Monomeric molecules in the crystal structures of magnesium(II) and zinc(II) complexes with imidazole-4-carboxylate and water ligands

Gryz¹,

Starosta

Leciejewicz

2007

Journal of Coordination Chemistry

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Magnesiumimidazolate: trans-diaquabis(imidazole-4-carboxylato-2 N,O)-magnesium(II) Mg(C 4 H 3 N 2 O 2 ) 2 (H 2 O) 2 crystallizes in the monoclinic system (space group P2 1 /c). The structure is composed of monomeric molecules, each containing a Mg(II) ion located at the inversion centre and chelated by two imidazole-4-carboxylate ligand molecules via their N,O bonding moieties (Mg-N 2.193(2)Å 0 , Mg-O 2.070(2)Å 0 ) and two water oxygen atoms (Mg-O 2.063(2)Å 0 . A fairly regular octahedron with water oxygen atoms at the apical positions is formed. The monomers are kept together by hydrogen bonds. Triclinic unit cell (space group P 1) of zinc imidazolate: [trans-diaquabis(imidazole-4-carboxylato-2 N,O)-zinc(II)] [monoaquabis(imidazole-4-carboxylato-N,O)-zinc(II)] trihydrate [Zn(C 4 H 3 N 2 O 2 ) 2 (H 2 O) 2 ][Zn(C 4 H 3 N 2 O 2 ) 2 (H 2 O)] Á 3H 2 O contains two monomeric complex molecules in which the Zn(II) ion is octahedrally coordinated by two trans ligand molecules and two water oxygen atoms. The unit cell also contains two monomeric complex molecules in which the Zn(II) ion is pentacoordinate with two ligand molecules and one water oxygen atom. Six solvation water molecules complete the content of the unit cell. Mean bond distances in the pentacoordinated Zn(II) polyhedron are: 2.101(2)Å 0 (Zn-O), 2.040(2)Å 0 (Zn-N) and 2.002(3)Å 0 (Zn-O water ). An extended network of hydrogen bonds is responsible for the stability of the structure.

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Section: Resultsmentioning

confidence: 99%

Monomeric molecules in the crystal structures of magnesium(II) and zinc(II) complexes with imidazole-4-carboxylate and water ligands

Gryz¹,

Starosta

Leciejewicz

2007

Journal of Coordination Chemistry

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“…32, 41 The two Zn-N distances differ slightly from each other, but both are within the range reported in the literature. 32,[40][41][42] The ditelluride forms a puckered seven membered chelate ring and binds zinc through the pyridyl nitrogen atom. The Te-Te distance can be compared with the distances in uncoordinated dipyridylditellurides (~2.68 A ˚).…”

Section: X-ray Crystallographymentioning

confidence: 99%

Bis(3-methyl-2-pyridyl)ditelluride and pyridyl tellurolate complexes of zinc, cadmium, mercury: Synthesis, characterization and their conversion to metal telluride nanoparticles

et al. 2009

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Treatment of an acetonitrile solution of metal chloride with bis(3-methyl-2-pyridyl)ditelluride, [Te(2)(pyMe)(2)], in the same solvent yielded complexes of composition [MCl(2){Te(2)(pyMe)(2)}] (M = Zn or Cd) whereas reactions of [MCl(2)(tmeda)] with NaTepyR (R = H or Me) gave tellurolate complexes of the general formula [M(TepyR)(2)] (M = Cd or Hg). When the cadmium complex [Cd(Tepy)(2)] was crystallized in the presence of excess tmeda, [Cd(Tepy)(2)(tmeda)] was formed exclusively. These complexes were characterized by elemental analyses, uv-vis, (1)H NMR data. The crystal structures of [ZnCl(2){Te(2)(pyMe)(2)}] and [Cd(Tepy)(2)(tmeda)] were established by single crystal X-ray diffraction. In the former zinc is coordinated to nitrogen atoms of the pyridyl group, while in the latter the coordination environment around tetrahedral cadmium is defined by the two neutral nitrogen atoms of tmeda, and two pyridyl tellurolate ligands. Thermal behavior of some of these complexes was studied by thermogravimetric analysis. Pyrolysis of [M(Tepy)(2)] in a furnace or in coordinating solvents such as hexadecylamine/tri-n-octylphosphine oxide (HDA/TOPO) at 350 and 160 degrees C, respectively gave MTe nanoparticles, which were characterized by uv-vis, photoluminiscence, XRD, EDAX and TEM.

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“…Single crystal X-ray diffraction studies on two nickel complexes with SalX ligands (X = NH, NCH 3 ) have shown the metal environments to be intermediate between square pyramidal and trigonalbipyramidal geometries, 6,7 while other studies have shown that Zn(cbpN).H 2 O, *For correspondence Zn(mbpN).H 2 O, Ni(mbpN) and Cu(mbpN) are all five-coordinate with the central donor atom coordinated to the metal atom. 8,9 The zinc complexes have trigonal bipyramidal geometry, while the copper and nickel complexes have distorted square pyramidal geometry.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and room temperature single crystal EPR studies of a dinickel complex having an Ni2(μ-phenoxide)2 2+ unit supported by a macrocyclic ligand environment [Ni2(L)2(OClO3)2] [L = 2-[(4-methyl-pyridin-2-ylimino)-methyl]-phenol]

et al. 2003

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A bimetallic nickel(II) complex with the ligand Hsalamp (2-[(4-methylpyridin-2-ylimino)-methyl]-phenol), having the molecular formula, Ni 2 C 26 H 22 N 4 O 10 Cl 2 , is synthesized and characterized by elemental, UV-Vis, IR and EPR studies. The IR spectrum confirms the presence of coordinated perchlorate ion and the UV-Vis. spectrum substantiates that the geometry around the metal ion is distorted square pyramidal. In the solvent methanol, the complex undergoes dissociation indicating the nature of the complex to be 1 : 2 electrolyte. The single crystal EPR studies indicate that the zero-field splitting is not large and the spectra can be observed even at room temperature, not so common for a nickel(II) ion. The spin Hamiltonian parameters calculated from single crystal rotations are: g-2⋅377, 2⋅219, 2⋅071 and D-9⋅7, 4⋅2 and-13⋅9 mT. Optical and electron paramagnetic spectral data have been used to obtain the parameters Dq, B and C.

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Structures and properties of zinc(II) complexes of NN-bis[(2-hydroxy-5-X-phenyl)phenylmethylene]-4-azaheptane-1,7-diamine (X = chloro or methyl): comparison of d 10, d 9, and d 8 analogues

Cited by 59 publications

References 0 publications

Monomeric molecules in the crystal structures of magnesium(II) and zinc(II) complexes with imidazole-4-carboxylate and water ligands

Monomeric molecules in the crystal structures of magnesium(II) and zinc(II) complexes with imidazole-4-carboxylate and water ligands

Bis(3-methyl-2-pyridyl)ditelluride and pyridyl tellurolate complexes of zinc, cadmium, mercury: Synthesis, characterization and their conversion to metal telluride nanoparticles

Synthesis and room temperature single crystal EPR studies of a dinickel complex having an Ni2(μ-phenoxide)2 2+ unit supported by a macrocyclic ligand environment [Ni2(L)2(OClO3)2] [L = 2-[(4-methyl-pyridin-2-ylimino)-methyl]-phenol]

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