Coordination of 2,2'-Biimidazole with Iron, Cobalt, Nickel and Copper

1979 ◽  
Vol 32 (3) ◽  
pp. 513 ◽  
Author(s):  
AS Abushamleh ◽  
HA Goodwin
Keyword(s):  
Spectral Data ◽  
High Spin ◽  
Weak Field ◽  
Trivalent Iron ◽  
Iron Cobalt ◽  
Cobalt Nickel ◽  
Bivalent Iron

Complexes of 2,2'-biimidazole with bivalent iron, cobalt, nickel and copper, and trivalent iron are described. The ligand produces a relatively weak field and all complexes are high-spin and markedly less stable than corresponding complexes of 2,2'-bipyridine or 2-(2-pyridyl)imidazole. Inner complexes, M(L-H)2, derived from the monoanion of biimidazole are also described. The complexes are characterized by magnetic and spectral data.

Metal complexes of 1,10-Phenanthroline derivatives. IV. Complexes of 1,10-Phenanthroline-2-carboxamide

1972 ◽  
Vol 25 (1) ◽  
pp. 37 ◽  
Author(s):  
HA Goodwin ◽  
FE Smith
Keyword(s):  
Oxygen Atom ◽  
Metal Complexes ◽  
High Spin ◽  
Chelating Agent ◽  
Weak Field ◽  
Amide Group ◽  
Magnetic Data ◽  
Iron Cobalt ◽  
Cobalt Nickel ◽  
Bivalent Iron

Complexes of the tridentate chelating agent 1,l0-phenanthroline-2- carboxamide, with bivalent iron, cobalt, nickel, and copper are described. Bis-ligand, six-coordinate complexes were obtained with all metals. A series of mono-ligand complexes, which are also believed to be six-coordinate, was also obtained. Infrared evidence indicates that the amide group is bound through the oxygen atom. Electronic spectral and magnetic data indicate that the ligand produces a relatively weak field and the iron complexes are high-spin. The tris-ligand iron(11) complex of pyridine-2-carboxamide is also described. This too is high-spin, although the bidentate amide apparently produces a slightly stronger field than the tridentate.

THE STABILITY OF METALLIC COMPLEXES OF TWO DIMETHYLPHENANTHROLINES

1963 ◽  
Vol 41 (5) ◽  
pp. 1135-1141 ◽  
Author(s):  
D. A. Brisbin ◽  
W. A. E. Mcbryde
Keyword(s):  
Ionic Strength ◽  
Cobalt Complexes ◽  
Formation Constants ◽  
Iron Cobalt ◽  
Cobalt Nickel ◽  
Nickel Copper ◽  
Bivalent Iron ◽  
The Stability ◽  
Partition Method ◽  
Stepwise Formation

The stepwise formation constants for the complexes formed by 5,6-dimethyl- and 4,7-dimethyl-1,10-phenanthroline with bivalent iron, cobalt, nickel, copper, and zinc were determined by a partition method. The measurements were made at 25 °C and in aqueous solutions having an ionic strength maintained at 0.1. The enhanced basicity of the ligands compared to the parent phenanthroline is paralleled by increased stability of the metallic complexes. The abnormally high formation constants of the cobalt complexes suggest oxidation to cobalt (III).

Metal complexes of 1,10-phenanthroline derivatives. XI. Complexes of 1,10-Phenanthroline-2,9-di(carbaldehyde phenylhydrazone)

1980 ◽  
Vol 33 (10) ◽  
pp. 2171 ◽  
Author(s):  
AS Abushamleh ◽  
HA Goodwin
Keyword(s):  
Metal Complexes ◽  
Chelating Agents ◽  
Selenium Dioxide ◽  
Open Chain ◽  
Iron Cobalt ◽  
Cobalt Nickel ◽  
Bivalent Iron ◽  
Steric Constraints

1,10-Phenanthroline-2,9-dicarbaldehyde has been prepared by oxidation of 2,9-dimethyl-1,10-phenanthroline with selenium dioxide. The value of the dialdehyde in the synthesis of open-chain multidentate chelating agents has been examined and the function of the di(phenylhydrazone) derivative is described. Steric constraints within the molecule render quadridentate function difficult and a distinct tendency to tridentate coordination is observed. Complexes of the dihydrazone with bivalent iron, cobalt, nickel and copper are described.

Extraction of iron, cobalt, nickel and copper with dibenzyl sulfoxide solution in toluene

1979 ◽  
Vol 44 (7) ◽  
pp. 2024-2031 ◽  
Author(s):  
František Vláčil ◽  
Huynh Dang Khanh
Keyword(s):  
Nitric Acid ◽  
Hydrochloric Acid ◽  
Distribution Ratio ◽  
Separation Factor ◽  
Chromatographic Separation ◽  
The Other ◽  
Iron Cobalt ◽  
Cobalt Nickel ◽  
Factor Α

The dependence of the distribution ratio of the metal on the concentration of hydrochloric of nitric acid was examined for Fe, Co, Ni and Cu extraction with 0.05M solution of dibenzylsulfoxide in toluene. Iron is extracted considerably more than the other metals, and is better extracted from hydrochloric acid than from nitric acid. The separation factor αFe/M (for 8M-HCl) is of the order of 104; this is not sufficient for a separation of trace quantities of iron from Co, Ni and Cu, but even at lower concentrations of HCl (e.g., 5M) the values is high enough for extraction chromatographic separation. The composition of the iron solvate extracted from HCl or LiCl medium was determined to be HFeCl4.2 B (B = dibenzyl sulfoxide).

scholarly journals On the Dissolution of Metals in Ionic Liquids 1. Iron, Cobalt, Nickel, Copper, and Zinc

2021 ◽  
Vol 2 (1) ◽  
pp. 63-73
Author(s):  
Jéssica D. S. Vicente ◽  
Domingas C. Miguel ◽  
Afonso M. P. Gonçalves ◽  
Diogo M. Cabrita ◽  
José M. Carretas ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Redox Potential ◽  
Final State ◽  
Iron Cobalt ◽  
Influence Of Temperature ◽  
Dissolution Reaction ◽  
Cobalt Nickel ◽  
Iron Metal ◽  
Copper And Zinc ◽  
Nickel Copper

Ionic liquids are critical reagents for science and technical processes nowadays. Metals are the most used reagents in the industry. It is crucial to have a deeper understanding of how ionic liquids and metals could interact. In this article the interaction of those two families of compounds is accessed. The dissolution (reaction) of metals with ionic liquids is studied, namely the influence of temperature, redox potential, and availability of an oxidant in the process. The final state achieved by the iron metal samples was also addressed by Mössbauer spectroscopy.

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