Studies on the Synthesis of Metal Complexes. IV. The Cobalt (III) Complexes of Ammoniatriacetic Acid

Abstract

The cobalt(III) complexes containing ammoniatriacetato group (ata) as a quadridentate ligand are newly prepared: i) α-K[Co ata(OH)(OH2)]·2H2O ii) β-K[Co ata(OH)(OH2)]·3H2O iii) K2[ataCo(OH)2Co ata]·6H2O iv) K2[Co ata(CO3)]·H2O v) K2[Co ata(C2O4)]·H2O In order to determine the structural formulae of these complexes, their visible, ultraviolet and infrared spectra were measured, as well as their thermal decomposition and their potency to coagulate ferric oxide sol.

Reaction of EDTA and Related Aminocarboxylate Chelating Agents with CoIIIOOH (Heterogenite) and MnIIIOOH (Manganite)

“…We will refer to this monomer complex as (Co III NTA)1. A third complex synthesized according to Mori et al (25) corresponds to a hydroxo-bridged dimer, which we will refer to as (Co III -NTA)2.…”

Preparation, structure, and interconversion kinetics of mono- and binuclear aquo(nitrilotriacetato)cobaltate(III) complexes

“…form15 kobsd = kKm2l(l+KlH+])(1) This can be cast into the inverted linear form[H+]/*obsd=l/fc+W[H*](2)A linear regression analysis according to eq 2 of all of the runs in TableI exceptthose footnoted15 yields the values k = 17.i v i d u a l n o t d i r e c t l y a s s o c i a t e d w i t h s c i t e i s p r o h i b i t e d .Table II. Rate Constants for Acid-Catalyzed Cleavage of the First µ-OH Bond of Several µ-)2Co(OH)2Co(en)2]4+ <*" +Mt[H+l)/(l +*i[ H+]) Estimated at 25 °C from data at 20 °C using the temperature coefficient quoted for compound 6.2…”

Bis(tetraphenylarsonium) di-μ-hydroxido-bis[(nitrilotriacetato)cobalt(III)] octahydrate

“…For synthetic background, related structures and kinetics, see: Mori et al (1958); Visser et al (1997Visser et al ( , 1999Visser et al ( , 2001Visser et al ( , 2002Visser et al ( , 2003. For twinning, which was resolved using the program ROTAX, see: Cooper et al (2002).…”

“…The title compound was prepared similar to the method described by Mori et al (1958). CoCl 2 .6H 2 O (5 g, 21 mmol) and nitrilotriacetic acid (4 g, 21 mmol) was added to a KHCO 3 solution (25 cm 3 , 2.5 M).…”