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.

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.

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. III. Complexes of 1,10-Phenanthroline-2-amidoxime

1970 ◽  
Vol 23 (8) ◽  
pp. 1545 ◽  
Author(s):  
HA Goodwin ◽  
FE Smith
Keyword(s):  
Metal Complexes ◽  
The Other ◽  
Copper Salts ◽  
Iron Cobalt ◽  
Cobalt Nickel ◽  
Binuclear Structure ◽  
Paramagnetic Complexes

Complexes of 1,l0-phenanthroline-2-amidoxime with iron, cobalt, nickel, and copper salts are described. Bis-ligand, six-covalent complexes were obtained with all metals. The iron(11) complex is spin-paired while the cobalt(11) and nickel(11) complexes are spin-free. Two series of mono-ligand complexes were obtained with copper(11). One of these consists of green, paramagnetic complexes of the uncharged ligand, and the other of brown, diamagnetic complexes of the deprotonated ligand. Salts of the two series are readily interconvertible. A binuclear structure is proposed for the cation in both series. Deprotonation of the bis-ligand cobalt(11) complex is accompanied by oxidation and cobalt(111) complexes of both the uncharged and the deprotonated ligand were obtained.

Metal complexes of 1,10-phenanthroline derivatives. VI. Complexes of iron, cobalt, nickel, and copper with 1,10-Phenanthroline-2-carbothioamide or N Phenyl-1,10-phenanthroline-2-carbothioamide

1973 ◽  
Vol 26 (12) ◽  
pp. 2623 ◽  
Author(s):  
HA Goodwin ◽  
DW Mather ◽  
FE Smith
Keyword(s):  
Temperature Dependence ◽  
Chelating Agents ◽  
Strong Field ◽  
Spin Transition ◽  
Anomalous Temperature Dependence ◽  
Anomalous Temperature ◽  
Iron Cobalt ◽  
Phenyl Derivative ◽  
Cobalt Nickel ◽  
Thioamide Group

Mono- and bis-ligand complexes of iron, cobalt, nickel and mono-ligand complexes of copper with the tridentate chelating agents 1,10- phenanthroline-2-carbo-thioamide and N-phenyl-1,10-phenanthroline-2- carbothioamide are described. Both ligands produce a strong field with iron(II) and the bis-ligand complexes of cobalt(II) and the former display a temperature-induced spin transition resulting in an anomalous temperature-dependence of their magnetism. In all the mono-ligand complexes the metal atom is believed to be six-coordinate. Both ligands may be deprotonated in their complexes and deprotonation of the N- phenyl derivative occurs spontaneously when it interacts with cobalt(II) or copper(II), the reaction with cobalt being accompanied by oxidation of the metal. Both ligands coordinate through the sulphur atoms of the thioamide group.

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).

Schiff Base Metal Complexes Precursor for Metal Oxide Nanomaterial: A Review

2020 ◽  
Vol 16 ◽  
Author(s):  
Meghshyam K. Patil ◽  
Vijay H. Masand ◽  
Atish K. Maldhure
Keyword(s):  
Schiff Base ◽  
Metal Complexes ◽  
Metal Oxides ◽  
Base Metal ◽  
Carbonyl Compounds ◽  
Organic Transformations ◽  
Iron Cobalt ◽  
Methods Of Synthesis ◽  
Schiff Base Metal Complexes ◽  
Nickel Manganese

: Schiff bases and their complexes are versatile compounds, which have been synthesized from the condensation of carbonyl compounds with amino compounds and exhibit a broad range of applications in biological, medicinal, catalysis, and industrial purposes. Furthermore, Schiff base-metal complexes have been used as a precursor for the synthesis of different metal oxides, which includes oxides of iron, cobalt, copper, nickel, manganese, vanadium, cadmium, zinc, mercury, etc. and ferrites such as Fe3O4, ZnFe2O4, and ZnCo2O4. These metal oxides have been utilized for several applications, which includes as a catalyst for several organic transformations and for biological activity. This review encompasses different methods of synthesis of metal oxides using Schiff base metal complexes precursor, their characterization, and various applications in detail.

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