scholarly journals Stability of Metal Complexes with a Ligand of Biological Interest: Noradrenaline

1999 ◽  
Vol 23 (2) ◽  
pp. 90-91
Author(s):  
Christian Gérard ◽  
Hanane Chehhal ◽  
Michel Aplincourt
Keyword(s):  
Metal Complexes ◽  
Equilibrium Constants ◽  
Biological Interest ◽  
Potentiometric Measurements

Stoichiometry, equilibrium constants and spectra of iron(III) complexes with noradrenaline have been determined from spectrophotometric measurements; in addition equilibrium constants of complexes with MgII, CdII and PbII have been determined from potentiometric measurements.

Solvent extraction studies of the system 64Cu/Htta/topo and the role of the metal complexes involved

1970 ◽  
Vol 23 (12) ◽  
pp. 2413
Author(s):  
EB Jacobs ◽  
WR Walker
Keyword(s):  
Solvent Extraction ◽  
Metal Complexes ◽  
Organic Phase ◽  
Ternary Complex ◽  
Equilibrium Constants ◽  
Synergistic Extraction ◽  
Back Extraction

Solvent extraction studies have been carried out on the system Cu/Htta/topo (Htta = thenoyltrifluoroacetone; topo = tri-n-octylphosphine oxide) with benzene as the organic phase. Using 64Cu as a tracer, equilibrium constants have been evaluated and compared with data obtained from the back-extraction of the labelled ternary complex 64Cu(tta)2(topo). The solubilities of binary and secondary complexes that are involved in synergistic extraction have also been measured.

Highly brominated porphyrins: synthesis, structure and their properties

2003 ◽  
Vol 07 (10) ◽  
pp. 682-692 ◽  
Author(s):  
Puttaiah Bhyrappa ◽  
Bhavana Purushothaman ◽  
Jagadese J. Vittal
Keyword(s):  
Crystal Structure ◽  
Metal Complexes ◽  
Equilibrium Constants ◽  
Coordination Geometry ◽  
Lewis Bases ◽  
Axial Ligation ◽  
Reduction Potentials ◽  
Oxidation Potentials ◽  
Porphyrin Core ◽  
Electron Deficiency

This article reports the first perbromination of β-pyrrole and meso-phenyl groups of the 5,10,15,20-tetrakis(3',5'-dimethoxyphenyl)porphinato copper(II) to generate highly brominated porphyrin, 2,3,7,8,12,13,17,18-octabromo-5,10,15,20-tetrakis(2',6'-dibromo-3',5'-dimethoxyphenyl)-porphinato copper(II), CuT (3',5'- DMP ) PBr 16 complex. Its crystal structure exhibited unusual five-coordination geometry with saddle shaped conformation of the porphyrin core. H2T(3',5'- DMP ) PBr 16 and its metal complexes exhibited large anodic shift of oxidation potentials with marginal changes in reduction potentials relative to their corresponding octabromotetraphenylporphyrin, MTPPBr 8 derivatives. The enhanced electron deficiency of the ZnT (3',5'-DMP)PBr16 complex was probed by axial ligation of various Lewis bases with differing pK a values. The ZnT (3',5'-DMP)PBr16 complex exhibited decrease in equilibrium constants for the ligation of bases relative to sterically unhindered ZnTPPBr 8. This has been ascribed to the sterics induced by the bulky ortho-bromo phenyl substituents that prevents the facile binding of Lewis bases to the Zn (II)-center.

N,N‘-Ethylenedi-l-cysteine (EC) and Its Metal Complexes:  Synthesis, Characterization, Crystal Structures, and Equilibrium Constants

1996 ◽  
Vol 35 (2) ◽  
pp. 404-414 ◽  
Author(s):  
Yuejin Li ◽  
Arthur E. Martell ◽  
Robert D. Hancock ◽  
Joseph H. Reibenspies ◽  
Carolyn J. Anderson ◽  
...  
Keyword(s):  
Metal Complexes ◽  
Crystal Structures ◽  
Equilibrium Constants
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