Metal chelates containing

A number of metal chelates containing transition metals in their higher oxidation states are known to decompose by one electron transfer process to generate free radical species, which may initiate graft copolymerization reactions. Different transition metals, such as Zn, Fe, V, Co, Cr, Al, etc., have been used in the preparation of metal acetyl acetonates and other diketonates. Several studies demonstrated earlier that metal acetyl acetonates can be used as initiators for vinyl polymeriza-... [Pg.487]

Metal chelates contain 1 1 molar ratio of ligand to metal ion. TMEN = tetramethyl-ethylenediamine DMEN = dimethylethylenediamine DIPY = a,a -bipyridine PHEN = o-phenanthroline HEN = iV-hydroxyethylethylenediamine DHEN = JV ,iV /-dihy-droxyethylethylenediamine. [Pg.169]

The method of ligand exchange has been used for preparation of metal chelates, containing N,S- 697 (3.110) [283] and N,Te-donor atoms 698 (3.111) in the coordination unit ... [Pg.202]

Metal chelates containing beta-diketonate ligands have been used for a variety of purposes, including gas chromatography of metals,1 metal plating on surfaces,2 solvent extraction of metals,3 5 catalysts, and fuel additives.6-7 The physical properties of these complexes that determine their usefulness in these areas are thermal stability, volatility, and solubility in nonpolar solvents. [Pg.144]

Metal chelates contain rings of atoms, structure II. The stability of the... [Pg.89]

Chelate ring size. The most stable metal chelates contain saturated ligands that form five-membered chelate rings or unsaturated ligands that form six-membered rings. [Pg.91]

In metal chelate adsorption chromatography a metal is immobilised by partial chelation on a column which contains bi- or tri- dentate ligands. Its application is in the separation of substances which can complex with the bound metals and depends on the stability constants of the various ligands (Porath, Carlsson, Olsson and Belfrage Nature 258 598 I975 Loennerdal, Carlsson and Porath FEES Lett 75 89 1977). [Pg.25]

Multi-element analyses involving solvent extraction and high performance liquid chromatography (HPLC) have also been described. The extracts, containing metal-chelate complexes with sulphur-containing reagents, such as dithizone and diethyldithiocarbamate, were used directly for determination of the metals by HPLC.14... [Pg.174]

A normal-phase HPLC separation seems to be useful to separate major chlorophyll derivatives, but it is not compatible with samples in water-containing solvents an additional extraction step is required to eliminate water from the extract since its presence rednces chromatographic resolution and interferes with retention times. Besides that, the analysis cannot be considered quantitative due to the difhculty in transferring componnds from the acetone solution into the ether phase. On the other hand, an advantage of the normal-phase method is its efficacy to separate magne-sinm-chlorophyll chelates from other metal-chelated chlorophyll derivatives. ... [Pg.433]

III. Metal Compounds Containing an X,Y-Carboranyl Chelating Ligand. 77... [Pg.61]

B. Metal Compounds Containing a C,N-Carboranyl Chelating Ligand. .. 80... [Pg.61]

E. Metal Complexes Containing the P,Si-Chelating o-Carboranyiphosphino Ligand... [Pg.72]

METAL COMPOUNDS CONTAINING AN X.Y-CARBORANYL CHELATING LIGAND... [Pg.77]

Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...