The nature of the coordination bond in metal complexes of substituted pyridine derivatives. III. 4-Methylpyridine complexes of some divalent transition metal ions

1968 ◽  
Vol 46 (20) ◽  
pp. 3137-3141 ◽  
Author(s):  
D. G. Brewer ◽  
P. T. T. Wong ◽  
M. C. Sears
Keyword(s):  
Infrared Spectroscopy ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Ions ◽  
Coordination Bond ◽  
Pyridine Derivatives ◽  
Normal Coordinate ◽  
Substituted Pyridines ◽  
Solid Complexes ◽  
Nitrogen Bond

Previous papers in this series investigated the nature of the coordination bond in copper(II) and zinc(II) complexes of 4-substituted pyridines by infrared spectroscopy. In this paper, the investigation has been extended to complexes of 4-methylpyridine with cobalt(II), manganese(II), and nickel(II). The geometry of the solid complexes is assigned, and the force constants associated with the metal–nitrogen bond were calculated from a normal coordinate analysis. The validity of the previously introduced Rπ parameter in these systems is discussed.

The nature of the coordination bond in metal complexes of substituted pyridine derivatives. V. 4-Methylpyridine complexes of Zn(II), Cd(II), and Hg(II)

1970 ◽  
Vol 48 (24) ◽  
pp. 3786-3789 ◽  
Author(s):  
M. C. Sears ◽  
W. V. F. Brooks ◽  
D. G. Brewer
Keyword(s):  
Force Field ◽  
Metal Complexes ◽  
Field Model ◽  
Coordination Bond ◽  
Pyridine Derivatives ◽  
Divalent Ions ◽  
Normal Coordinate ◽  
Valence Force ◽  
Valence Force Field ◽  
Zinc Cadmium

In this paper, an attempt is made to interpret the π-bonding between a 4-methylpyridine ligand and the divalent ions of zinc, cadmium, and mercury, using the previously introduced Rπ parameter. To do this, the ν12 mode in the complexes is assigned and confirmed by a normal coordinate analysis based on a valence force field model.

Nature of the coordination bond in metal complexes of substituted pyridine derivatives. I. The substituent effect on the coordination bond

1968 ◽  
Vol 46 (2) ◽  
pp. 131-138 ◽  
Author(s):  
Patrick T. T. Wong ◽  
D. G. Brewer
Keyword(s):  
Free Energy ◽  
Bond Strength ◽  
Metal Complexes ◽  
Infrared Spectra ◽  
Substituent Effect ◽  
Coordination Bond ◽  
Spectroscopic Methods ◽  
Pyridine Derivatives ◽  
Coordination Center ◽  
Substituted Pyridines

The nature of the coordination bond in some metal complexes of 4-substituted pyridines has been investigated by thermodynamic and infrared spectroscopic methods. The effects of the substituents upon the coordination bond strength in the copper(II) complexes of these ligands have been found by direct measurement of the heats of coordination. These effects have been further described by the substituent effect upon the change in free energy of the coordination center in the ligands. A new parameter, Rπ, measuring the relative π bonding in the complexes of 4-substituted pyridines has been introduced. For this purpose a series of complexes of the types [M(4—R—C5H4N)2Cl2] and [(4—R—C5H4N)•HCl] (R = CH3, CH2OH, H, COCH3, CONH2, COOCH3, CN; M = Cu(II), Zn(II)) has been isolated, and the infrared spectra of these complexes and the free ligands have been examined.

Synthesis, Characterization and in vitro Biological Evaluation of a New Schiff Base Derived from Drug and its Complexes with Transition Metal Ions

2018 ◽  
Vol 69 (7) ◽  
pp. 1678-1681
Author(s):  
Amina Mumtaz ◽  
Tariq Mahmud ◽  
M. R. J. Elsegood ◽  
G. W. Weaver
Keyword(s):  
Schiff Base ◽  
Transition Metal ◽  
Metal Ions ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Free Ligand ◽  
Transition Metal Ions ◽  
Biological Evaluation ◽  
Pyridoxal Hydrochloride

New series of copper (II), cobalt (II), zinc (II), nickel (II), manganese (II), iron (II) complexes of a novel Schiff base were prepared by the condensation of sulphadizine and pyridoxal hydrochloride. The ligand and metal complexes were characterized by utilizing different instrumental procedures like microanalysis, thermogravimetric examination and spectroscopy. The integrated ligand and transition metal complexes were screened against various bacteria and fungus. The studies demonstrated the enhanced activity of metal complexes against reported microbes when compared with free ligand.

scholarly journals The proton and metal complexes of adenyl-5′-yl imidodiphosphate

1976 ◽  
Vol 159 (1) ◽  
pp. 169-171 ◽  
Author(s):  
L D Pettit ◽  
K F Siddiqui
Keyword(s):  
Complex Formation ◽  
Transition Metal ◽  
Metal Ions ◽  
Metal Complexes ◽  
Transition Metal Ions ◽  
Formation Constants ◽  
Enthalpy Change ◽  
Two Temperatures ◽  
Bivalent Transition Metal

The formation constants of the complexes of adenyl-5′-yl imidodiphosphate with H+ Mg2+, Ca2+ and a number of bivalent transition-metal ions were measured potentionmetrically. The complexes are generally a little more stable than the analogous complexes of ATP. By measuring the formation constants at two temperatures, this increase in stability was shown to result from an increased enthalpy change on complex-formation.

ChemInform Abstract: Synthesis of Aryl-Substituted Pyridines by Liquid-Phase Condensation of Aldehydes with Urea Catalyzed by Transition Metal Complexes.

ChemInform ◽  
1989 ◽  
Vol 20 (22) ◽  
Author(s):  
U. M. DZHEMILEV ◽  
F. A. SELIMOV ◽  
A. ZH. AKHMETOV ◽  
A. A. FATYKHOV
Keyword(s):  
Liquid Phase ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Substituted Pyridines

Synthesis of aryl-substituted pyridines by liquid-phase condensation of aldehydes with urea, catalyzed by transition metal complexes

1988 ◽  
Vol 37 (10) ◽  
pp. 2102-2106
Author(s):  
U. M. Dzhemilev ◽  
F. A. Selimov ◽  
A. Zh. Akhmetov ◽  
A. A. Fatykhov
Keyword(s):  
Liquid Phase ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Substituted Pyridines
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