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. 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. XIV. Complexes of 1,10-Phenanthrolin-2-yl(pyridin-2-yl)amine

1984 ◽  
Vol 37 (2) ◽  
pp. 281 ◽  
Author(s):  
AS Abushamleh ◽  
HA Goodwin ◽  
CG Benson ◽  
GJ Long
Keyword(s):  
Metal Complexes ◽  
Spectral Data ◽  
High Spin ◽  
Metal Ion ◽  
Chelate Ring ◽  
Chelating Agent ◽  
Membered Chelate Ring

1,10-Phenanthrolin-2-yl(pyridin-2-yl)amine has been prepared in low yield from 2-chloro-1,10- phenanthroline and pyridin-2-amine. The molecule coordinates as a tridentate chelating agent of the ter-imine type and produces low-spin complexes with iron(II) in both its neutral and anionic forms. The bis(ligand) cobalt(II) complex is high-spin. Although the ligand provides a slightly weaker field than terpyridine, electronic and Mossbauer spectral data indicate a less distorted metal ion environment in its complexes, compared with those of terpyridine. This is correlated with the presence of the six-membered chelate ring.

Metal complexes of 1,10-Phenanthroline derivatives. VII. Complexes of 1,10-Phenanthroline-2-carbaldehyde hydrazones

1974 ◽  
Vol 27 (5) ◽  
pp. 965 ◽  
Author(s):  
HA Goodwin ◽  
DW Mather
Keyword(s):  
Field Strength ◽  
Metal Complexes ◽  
High Spin ◽  
Spin State ◽  
Spin Transition ◽  
Pronounced Change ◽  
Temperature Range ◽  
Spin Pairing ◽  
Bivalent Iron ◽  
Experimental Temperature Range

A series of substituted hydrazones derived from 1,l0-phenanthroline-2-carbaldehyde and their bis-ligand complexes with bivalent iron and nickel are described. The hydrazones show a gradation in field strength and this is reflected in the spin-state of the iron complexes. The methylhydrazone complex is essentially low-spin over the temperature range 83-363 K but the presence of some spin-free species at high temperatures is evident. Within the same range the dimethylhydrazone complex is essentially high-spin but undergoes significant spin-pairing and the phenylhydrazone complex displays a complete 5T2 → 1A1 spin transition. This transition is very sharp, resulting in a pronounced change in the magnetism, and colour, of the complex within a few degrees. Complexes of the 2-pyridylhydrazone, the methylphenylhydrazone and the diphenylhydrazone are high-spin over the entire experimental temperature range.

Metal complexes of tridentate hybrid ligands. I. Cobalt and nickel conlplexes of ligands containing the donor sequence As-N-O

1969 ◽  
Vol 22 (11) ◽  
pp. 2315 ◽  
Author(s):  
B Chiswell ◽  
KW Lee
Keyword(s):  
Metal Complexes ◽  
Electronic Spectra ◽  
Weak Field ◽  
Magnetic Data ◽  
Conductivity Measurements ◽  
Hybrid Ligands ◽  
Cobalt And Nickel

The interaction of the new tridentate ?hybrid? ligand, N-o- dimethylarsino-phenylsalicylaldimine (As-N-O), with cobalt(II) salts leads to the formation of cationic octahedral cobalt(III) complexes of the type [Co(As-N-O)2]+. No cobalt(II) complex entities containing the ligand could be isolated. With nickel(II) salts three types of octahedral complexes were obtained: (a) [Ni(As-N-O)2],H2O, (b) Ni(As-N- O)X,-xH2O (X = Cl, Br, or NCS), (c) [Ni2(As-N-O)3ClO4]. Electronic spectra, conductivity measurements, and magnetic data have been used to determine the structure of the complexes isolated. The ?hybrid? ligand appears to operate overall as a relatively weak field ligand.

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.

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