4 research outputs found
POLAROGRAPHIC BEHAVIOUR OF SOME COBALT(III) COMPLEXES WITH ETHYLENEDIAMINE
The polarographic behaviour of various cobalt(III)-amine complexes with ethylenediamine
were studied in Britton-Robinson buffer solutions and also in the presence of
1,2-cyclohexane dione dioxime. It was observed that the cobalt(III)-amine complexes,
generally, are reduced in two steps. The first wave (Co(III) -> Co(II)) has an irreversible
character, the second one corresponds rather to a Co(II)-ligand -> Co(0) step, than to a .
[Co(H20)6]2+ -> Co(0) reduction, as presumed earlier. In the presence of dioximes the
hexamine and monoacidopentamine type cobalt(llI) complexes do not undergo substitution
reactions under the above mentioned experimental conditions
ÜBER DIOXIMINKOMPLEXE DER ÜBERGANGSMETALLE. LXXX. KATALYTISCHE POLAROGRAPHISCHE REDUKTION VON HYDROXYLAMIN IN ANWESENHEIT VON EISEN(II)-DIOXIMINKOMPLEXEN
The stability constants of the iron(II)-nyoximine chelates: Fe(Nyox. H)* and Fe(Nyox. H)2
in aqueous NaClO4 -Britton-Robinson buffer solutions have been determined polarographi-
cally. In the Fe(II)-nyoxime system appears a catalytic wave in the presence of hydroxylamine,
with a half wave potential of -0.90 V (vs. SCE), suitable for the quantitative polarographic
determination of hydroxylamine, also in the presence of hydrazine
ON THE DIOXIMINE COMPLEXES OF TRANSITION METALS. XCI. POLAROGRAPHIC STUDIES ON VARIOUS TYPES OF DIOXIMINE COMPLEXES OF COBALT(III)
The polarographic behaviour of some dioximine chelates of cobalt(III) (α-dioxime:
Diox.H2, DH2-dimethylglyoxime, Nyox.H2=nyoxime, Heptox.H2=heptoxime ):[Co(DH)2
(amine)2]+, [Co(Nyox.H)2(amine)2]+, [Co(Diox.H)2XY]-(X, Y=Cl, Br, I, N02, N3, CN),
[Co(DH)2(S03)(amine)]-, (alkyl-Co(DH)2 (amine) were studied at various pH-values (cathodic
reductions and in some cases also anodic oxidations).
The Co(II)-nyoxime system and the formation of [Co(Diox.H)2en]- by the substitution
reactions of 1,2- and 1,6-[Co(en)2CI2]+ and [Co(en)CI(H20)]2+ with α-dioximes
were studied in this way