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).

Reactions of Sodium N,N-Diethyldithiocarbamate and Potassium Ethyl Xanthate with some 3d Transition Metal Halides in the presence of 2,2′-Bipyridyl and 1,10-Phenanthroline

1971 ◽  
Vol 49 (16) ◽  
pp. 2726-2732 ◽  
Author(s):  
D. G. Holah ◽  
C. N. Murphy
Keyword(s):  
Transition Metal ◽  
Methylene Chloride ◽  
Cobalt Complexes ◽  
Divalent Metal ◽  
Metal Halides ◽  
Iron Cobalt ◽  
Nitrogen Bases ◽  
Ethyl Xanthate ◽  
Cobalt Nickel ◽  
Nickel Copper

The synthesis and some properties of ethylxanthate (Xan−) complexes, MXan2 and MXan3− (M = manganese(II) and iron(II)) are reported. Reactions between divalent metal halides (manganese, iron, cobalt, nickel, copper, and zinc) and Xan− and between the metal halides and N,N-diethyldithiocarbamate (dtc−) in the presence of nitrogen bases 1,10-phenanthroline (phen) and 2,2′-bipyridyl (bipy) are described. The major products of these reactions are complexes of the type MXan2.Base and Mdtc2.Base (with notable exceptions). In the former series with bipy, two different crystalline modifications of the manganese, iron, and cobalt complexes are formed, and copper(II) is reduced to copper(I) by Xan− in the presence of both bases. In the nickel–dtc system with bipy, Nidtc2 is produced, while with phen, the complex [Niphen3]dtc2 is formed. The latter reacts very rapidly with methylene chloride. Cudtc2 is produced from the copper(II)/base/dtc reactions.

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.

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.

Diisothiocyanatotetrapyridine and Diisothiocyanatodipyridine Complexes of Dipositive First-Transition-Metal Ions (Manganese, Iron, Cobalt, Nickel, Copper, and Zinc)

2007 ◽  
pp. 251-256 ◽  
Author(s):  
George B. Kauffman ◽  
Richard A. Albers ◽  
Fred L. Harlan ◽  
R. Scott Stephens ◽  
Ronald O. Ragsdale
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Transition Metal Ions ◽  
Iron Cobalt ◽  
Cobalt Nickel ◽  
Copper And Zinc ◽  
Nickel Copper

Complexes of bivalent iron, cobalt, nickel, and copper with bis(2-dimethylaminoethyl)oxide

1967 ◽  
Vol 6 (3) ◽  
pp. 445-449 ◽  
Author(s):  
Mario Ciampolini ◽  
N. Nardi
Keyword(s):  
Iron Cobalt ◽  
Cobalt Nickel ◽  
Bivalent Iron

Poly-Bis(Thiocyanato-N)Bis-μ-(1H-1,2,4-Triazole-N2,N4)Metal(II) Complexes with Manganese, Iron, Cobalt, Nickel, Copper and Zinc, and Bis[Tris(Thiocyanato-N)Tris(μ-4H-1,2,4-Triazole-N1)Nickel(II)-N2,N2′,N2″]Nickel(II)

2007 ◽  
pp. 157-161 ◽  
Author(s):  
J. G. Haasnoot ◽  
D. W. Engelfriet ◽  
J. Reedijk ◽  
James T. Cronin ◽  
J. A. Mclaren ◽  
...  
Keyword(s):  
Iron Cobalt ◽  
Cobalt Nickel ◽  
Copper And Zinc ◽  
Nickel Copper

Stabilities of Vanadyl Complexes with Methionine, Phenylalanine, and Threonine

1974 ◽  
Vol 29 (7-8) ◽  
pp. 336-338
Author(s):  
B.S. Sekhon ◽  
S.L. Chopra
Keyword(s):  
Free Energy ◽  
Ionic Strength ◽  
Stability Constants ◽  
Thermodynamic Stability ◽  
Chloride Solution ◽  
Formation Constants ◽  
Potassium Chloride Solution ◽  
Vanadyl Complexes ◽  
Overall Stability ◽  
Stepwise Formation

Abstract Stepwise formation constants corresponding to 1:1 vanadyl complexes with methionine, phenylalanine and threonine have been determined at 25 °C, and at various ionic concentrations, viz. 0.01, 0.1 and 0.3 ᴍ , maintained by the addition of potassium chloride solution. Thermodynamic stability constants have been obtained by extrapolation of log K values to zero ionic strength. Logarithms of the overall stability constants (log K (u = 0)) are 7.72 for methionine, 7.70 for phenyl­alanine and 7.44 for threonine complexes. The corresponding free energy changes (⊿G0) are - 10.53, - 10.51, - 10.15 kcal-mol-1 respectively.

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