Novel cobalt(II) complexes with pyridyl/ether or pyridyl/thioether ligands. The conversion of pyridyl/thioether cobalt(II) complex to pyridyl/sulfinato cobalt(III) compound

Mohamadou, Aminou; Jubert, Caroline; Barbier, Jean‐Pierre

doi:10.1016/j.ica.2005.09.057

Cited by 11 publications

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“…The metal–nitrogen distances are all elongated compared to their four-coordinate − and five-coordinate ,− N 4 -analogues. The furan ring coordinates in an η 1 fashion via the oxygen with M–O distances similar to ether oxygen–metal bonds. − In general, the exact assignment of the heteroatoms is difficult due to almost identical carbon–oxygen and carbon–nitrogen distances. However, the problem could be solved on the basis of the relative peak intensities of the heteroatoms as well as the metal–donor distances.…”

Section: Resultsmentioning

confidence: 99%

Molecular Structure, UV/Vis Spectra, and Cyclic Voltammograms of Mn(II), Co(II), and Zn(II) 5,10,15,20-Tetraphenyl-21-oxaporphyrins

et al. 2013

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The 5,10,15,20-tetraphenyl-21-oxaporphyrin complexes of Mn(II), Co(II), and Zn(II) have been crystallized and studied by X-ray diffraction, NMR and UV/vis spectroscopy, and mass spectrometry as well as cyclic voltammetry. The X-ray structure of the earlier described Cu(II) complex is also reported. All complex structures possess a five-coordinate, approximately square-pyramidal geometry with a slight deviation of the heteroaromatic moieties from planarity. The packing structures are characterized by parallel strands of complex molecules interacting by weak hydrogen bonds. In the case of Zn(II) an octahedral complex has also been isolated using a side-chain hydroxy functionalized oxaporphyrin ligand; the structure was verified by NMR and EXAFS spectroscopy. Cyclic voltammetry studies reveal that the reduction of the complex bound Mn(II), Co(II), and Zn(II) ions is a ligand-centered process whereas the first oxidation step depends on the metal ion present.

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Section: Resultsmentioning

confidence: 99%

Molecular Structure, UV/Vis Spectra, and Cyclic Voltammograms of Mn(II), Co(II), and Zn(II) 5,10,15,20-Tetraphenyl-21-oxaporphyrins

et al. 2013

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“…Several examples of these types of complexes exist in the literature, Mohamadou et al (2) have reported the solid-state characterization of the enantiomeric pair of fac-ΔSR all cis and fac-ΛRS all cis [Co(pynso…”

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confidence: 99%

“…Several examples of these types of complexes exist in the literature, Mohamadou et al have reported the solid-state characterization of the enantiomeric pair of fac-ΔSR all cis and fac-ΛRS all cis [Co(pynso) 2 ] + [pynso = 3-(2-pyridylmethylamino)ethanesulfinate, pyCH 2 NHCH 2 CH 2 SO 2 − ], crystallizing in the same crystal lattice (Figure ).…”

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confidence: 99%

“…The stereoisomers can be viewed along the axis placing a given atom, here chosen as atom A , at the summit, and having either A , B , or C in the lower axial position. We will consider the five diastereomeric forms (4 achiral, one chiral) of a general [M( A ) 2 ( B ) 2 ( C ) 2 ] complex , ,then consider the possible stereochemical arrangements of the A - B - C bonds and eliminate any duplicates.…”

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Drawing Mononuclear Octahedral Coordination Compounds Containing Tridentate Chelating Ligands

2010

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“…The bioinorganic chemistry of the transition metal complexes has become increasingly important since the identification that metal ions occur in the active sites of several very important classes of metallo‐enzymes . Trace metal elements always exist in organisms and their pharmacological functions cannot be neglected.…”

Section: Introductionmentioning

confidence: 99%

Solvent effects of N‐nitroso, N‐(2‐chloroethyl), N′,N′‐dibenzylsulfamid and its copper(II) and cobalt(II) complexes: fluorescence studies

et al. 2012

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The structure of N-nitroso, N-(2-chloroethyl), N',N'-dibenzylsulfamid (CENS) was established by X-ray crystallography. The atomic coordinates, factors of isotropic thermal agitation, bond lengths and valence angles were determined. The solvent effects on the electronic absorption and fluorescence spectra of CENS were investigated at room temperature. The effects of solvent polarity and of hydrogen bonding were interpreted by means of linear solvation energy relationships (LSERs). Multiple linear regression analysis indicated that the hydrogen donation properties of the solvent play an important role in determining the position of the absorption maximum, while the classical polarity of the medium is the only dominating parameter in determining the emission maximum and the Stokes' shift. Complexation of the investigated compound by two different transition metal ions was studied. Fluorescence measurements show that fluorescence quenching by cobalt(II) is more important than that by copper(II). This phenomenon can be attributed to good stereo-structural matching between the electronic configuration of the Co(2+) ion and the active site distribution of CENS in aqueous solution.

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Novel cobalt(II) complexes with pyridyl/ether or pyridyl/thioether ligands. The conversion of pyridyl/thioether cobalt(II) complex to pyridyl/sulfinato cobalt(III) compound

Cited by 11 publications

References 40 publications

Molecular Structure, UV/Vis Spectra, and Cyclic Voltammograms of Mn(II), Co(II), and Zn(II) 5,10,15,20-Tetraphenyl-21-oxaporphyrins

Molecular Structure, UV/Vis Spectra, and Cyclic Voltammograms of Mn(II), Co(II), and Zn(II) 5,10,15,20-Tetraphenyl-21-oxaporphyrins

Drawing Mononuclear Octahedral Coordination Compounds Containing Tridentate Chelating Ligands

Solvent effects of N‐nitroso, N‐(2‐chloroethyl), N′,N′‐dibenzylsulfamid and its copper(II) and cobalt(II) complexes: fluorescence studies

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