Synthesis and coordinating properties of the anionic tridentate ligand, methyl tris(1-pyrazolyl)gallate, [MeGa(N2C3H3)3]−. X-ray crystal structure of [MeGa(N2C3H3)3]Mo(CO)2(η3-C3H5)

1978 ◽  
Vol 56 (16) ◽  
pp. 2099-2108 ◽  
Author(s):  
Kenneth R. Breakell ◽  
Steven J. Rettig ◽  
Douglas L. Singbeil ◽  
Alan Storr ◽  
James Trotter
Keyword(s):  
Crystal Structure ◽  
Transition Metal ◽  
Transition Metal Ions ◽  
Tridentate Ligand ◽  
Central Metal ◽  
Carbonyl Complexes ◽  
X Ray ◽  
Carbonyl Derivatives ◽  
Length Data

The anionic tridentate ligand, [MeGa(N2C3H3)3]−, has been characterized and its coordinating properties studied. It acts as a six-electron chelating ligand to divalent transition metal ions giving complexes of the type, [MeGa(N2C3H3)3]2M (M = Mn, Fe, Co, Ni, Cu, Zn), believed to possess an octahedral MN6 core. The ligand also forms numerous carbonyl complexes and its coordinating ability in Mo, W, and Mn carbonyl derivatives is compared with that of similar boron ligands and the η5-C5H5 ligand. From ir measurements and bond length data it appears that the [MeGa(N2C3H3)3]− ligand is superior in creating an electron-rich transition metal centre, and it also affords greater steric protection for the central metal. The expected tridentate chelating nature of the new ligand has been demonstrated through a crystal structure determination of the complex [MeGa(N2C3H3)3]Mo(CO)2(η3-C3H5). Crystals of this complex are tetragonal, a = 26.217(3), c = 10.723(2) Å, Z = 16, space group I41/a. The structure was solved by Patterson and Fourier syntheses and was refined by full-matrix least-squares procedures to a final R of 0.030 and Rw of 0.031 for 2582 reflections with I ≥ 3σ(I).

Transition metal complexes of a tridentate ligand bearing two pendant pyridine bases: The X-ray crystal structure of pentacoordinate copper(II) complex

2005 ◽  
Vol 358 (13) ◽  
pp. 3799-3806 ◽  
Author(s):  
Kalagouda Gudasi ◽  
Ramesh Vadavi ◽  
Rashmi Shenoy ◽  
Manjula Patil ◽  
Siddappa A. Patil ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Tridentate Ligand ◽  
X Ray ◽  
Pyridine Bases

Crystal-Structure of Bis(2,2'-6',2'-terpyridine)manganese(II) Bis(triiodide) [Mn(terpy)2](I3)2

1991 ◽  
Vol 44 (2) ◽  
pp. 303 ◽  
Author(s):  
R Bhula ◽  
DC Weatherburn
Keyword(s):  
Crystal Structure ◽  
Transition Metal ◽  
Metal Ions ◽  
Coordination Sphere ◽  
Metal Ion ◽  
Transition Metal Ions ◽  
Triclinic Space Group ◽  
X Ray ◽  
X Ray Crystallography ◽  
Distorted Octahedral

The crystal structure of [ Mn ( terpy )2](I3)2( terpy = 2,2°:6°,2°-terpyridene) has been determined by X-ray crystallography. The crystals are triclinic, space group Pī , a 9.357(4), b 8.600(2), c 24.531(8) Ǻ, α 93.64(2), B 95.58(3), γ 91.52(2)°, Z 2, V 1960(1)Ǻ3. The structure has been refined to a residual R of 0.065 (Rw 0.070). The coordination sphere of the metal ion is distorted octahedral with each terpy ligand coordinated in a meridional fashion. The structure is compared with those of other M( terpy )2n+ complexes formed by first-row transition metal ions.

N,N-Disubstituierte Nʹ-Ferrocenoylthioharnstoffe als zweizähnige Komplexliganden für Übergangsmetallionen. Kristallstruktur von Bis-(N,N-diethyl-Nʹ-ferrocenoylthioureato)nickel(II) / N,N-Disubstituted Nʹ-Ferrocenoyl Thioureas as Bidentate Ligands for Transition Metal Ions. Crystal Structure of Bis-(N,N-diethyl-Nʹ-ferrocenoylthioureato)nickel(II)

1995 ◽  
Vol 50 (11) ◽  
pp. 1679-1684 ◽  
Author(s):  
Oliver Seidelmann ◽  
Lothar Beyer ◽  
Rainer Richter
Keyword(s):  
Crystal Structure ◽  
Transition Metal ◽  
Metal Ions ◽  
Transition Metal Ions ◽  
Potassium Thiocyanate ◽  
Bidentate Ligands ◽  
Space Group ◽  
X Ray

N,N-diethyl-Nʹ-ferrocenoyl-thiourea and N-(morpholino-thiocarbonyl)ferrocenecarboxylic amide have been prepared by the reaction of ferrocenoyl chloride with potassium thiocyanate and the respective amine in dry acetone. These bidentate ligands yield neutral heterometalIic complexes with Ni(II), Cu(II), Mn(II) and Co(III). The dark brown air stable crystals of bis-(N,N-diethyl-Nʹ-ferrocenoylthioureato)nickel(II) were characterized by X-ray structure de­termination. Lattice dimensions: a = 1870.9(1), 6= 1161.5(1), c = 1491.4(1) pm; space group Pca21, Z = 4, R = 0.030 for 5707 observed reflections.

scholarly journals Synthesis and Characterization with Antimicrobial Activity Studies on some Transition Metal Complexes of N, O Donor Novel Schiff Base Ligand

2017 ◽  
Vol 9 (2) ◽  
pp. 209-218 ◽  
Author(s):  
M. S. Hossain ◽  
C. M. Zakaria ◽  
M. K. Zahan
Keyword(s):  
Schiff Base ◽  
Transition Metal ◽  
Metal Complexes ◽  
Schiff Base Ligand ◽  
Transition Metal Ions ◽  
Tridentate Ligand ◽  
Central Metal Atom ◽  
Complexation Reaction ◽  
Central Metal ◽  
Physical Measurements

Metal complexes of Mn(II), Fe(II), Co(II) and Cd(II) ions with Schiff base ligand 4-{(pyridin-2-ylimino)methyl}phenol derived from condensation of 2-amino pyridine with 4-hydroxybenzaldehyde was prepared. The ligand and complexes were isolated from the reaction in the solid form  and characterized by conductivity, magnetic moment, TLC, IR, UV-Visible, thermal analysis and some physical measurements. During complexation reaction with transition metal ions Schiff base act as a deprotonated tridentate ligand and IR spectra showed that N and O atoms are coordinated to the central metal atom. The observed values confirmed that the complexes have octahedral geometry. The Schiff base and its metal complexes have been found to have moderate to strong antibacterial activity.

scholarly journals 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

2018 ◽  
Vol 9 (4) ◽  
pp. 281-286
Author(s):  
Amadou Gueye ◽  
Farba Bouyagui Tamboura ◽  
Jean-Marc Planeix ◽  
Nathalie Gruber ◽  
Mohamed Gaye
Keyword(s):  
Transition Metal ◽  
Magnetic Measurements ◽  
Transition Metal Ions ◽  
Tridentate Ligand ◽  
Orthorhombic Space Group ◽  
1H And 13C Nmr ◽  
X Ray ◽  
X Ray Crystallography ◽  
Direct Condensation

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.

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