Reactivity of neutral nitrogen donors in planar d8 metal complexes. Part 1. The system [1,2-bis(phenylsulfanyl)-ethane]dichloroplatinum(II) with pyridines in methanol. Effect of basicity and steric hindrance

1994 ◽  
pp. 1805 ◽  
Author(s):  
Marcello Bellicini ◽  
Lucio Cattalini ◽  
Giampaolo Marangoni ◽  
Bruno Pitteri
Keyword(s):  
Metal Complexes ◽  
Steric Hindrance ◽  
Nitrogen Donors

The formation constants of some metal complexes with 3-Acetyl-4-hydroxycoumarin, dehydroacetic acid, and their oximes

1971 ◽  
Vol 24 (5) ◽  
pp. 925 ◽  
Author(s):  
GCS Manku
Keyword(s):  
Metal Complexes ◽  
Sodium Perchlorate ◽  
Formation Constants ◽  
Ionic Concentration ◽  
Dehydroacetic Acid ◽  
Nitrogen Donors ◽  
Oxygen Donors

The formation constants (K1, K2, and β2) of the complexes of 3-acetyl-4- hydroxycoumarin (ahc) and dehydroacetic acid (dha) and their respective oximes, ahco and dhao, with iron(II), cobalt(II), nickel(II), copper(II), zinc(II), calcium(II), magnesium(II), cadmium(II), dioxouranium(VI), iron(III), aluminium(III), scandium(III), indium(III), yttrium(III), and lanthanon(III) ions (lanthanum to lutetium inclusive with the exception of promethium) have been determined pH-metrically at 35� in 50% v/v aqueous dioxan medium with 0.100M sodium perchlorate as the constant ionic concentration, using Calvin and Wilson's pH-metric technique. The trends in the formation constants of these complexes are discussed. It is observed that, except in the case of Co2+, Ni2+, and Cu2+ ions, for which chelation through nitrogen donors is more favoured, all other ions prefer coordination through oxygen donors.

Metal Complexes of 6-Hydroxymethylpyridine-2-carboxylic Acid

1962 ◽  
Vol 15 (4) ◽  
pp. 786 ◽  
Author(s):  
RW Green ◽  
GKS Ooi
Keyword(s):  
Carboxylic Acid ◽  
Transition Metal ◽  
Metal Ions ◽  
Metal Complexes ◽  
Stability Constants ◽  
Steric Hindrance ◽  
Transition Metal Ions ◽  
Complexing Agent ◽  
Ph Titration ◽  
The Stability

Spectrophotometric and pH-titration methods have been used to determine the stability constants at 25 �C of complexes between transition metal ions and the anion of 6-hydroxymethylpyridine-2-carboxylic acid. This anion is found to be a weaker base and a weaker complexing agent than the pyridine-2-carboxylate ion. There is some evidence for steric hindrance of tris complexes.

Palladium(II) and platinum(II) complexes of 2,9-Dimethyl-1,10-phenanthroline. I. Halide compounds

1971 ◽  
Vol 24 (2) ◽  
pp. 303 ◽  
Author(s):  
RA Plowman ◽  
LF Power
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Steric Hindrance ◽  
Methyl Groups

Complexes of 2,9-dimethyl-1,10-phenanthroline with palladium(II) and platinum(II) halides are described. The methyl groups of the ligand introduce strong steric hindrance in some of the normal geometries of these transition-metal complexes, and evidence is presented for five- coordination in the bis(dmp) compounds of these two metals.

Metal complexes with tetrapyrrole ligands. 49. Solid-state and solution structures of iron(III) porphodimethenes. Effects of steric hindrance

1988 ◽  
Vol 27 (5) ◽  
pp. 927-933 ◽  
Author(s):  
Andreas Botulinski ◽  
Johann W. Buchler ◽  
Young J. Lee ◽  
W. Robert Scheidt ◽  
Mark Wicholas
Keyword(s):  
Solid State ◽  
Metal Complexes ◽  
Steric Hindrance ◽  
Solution Structures
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