Ternary complexes of the Cu(II) and Ni(II) chelates of edta and dcta with cyanide and ethylenediamine.
The formation of the ternary complexes CuEDTA(en)(2-), CuEDTA(CN)(3-), CuDCTA(CN)(3-), NiDCTA(CN)(3-) and NiEDTA(en)(2-) has been established spectrophotometrically. The stability constants found were log K = 2.87 +/- 0.03, 3.76 +/- 0.06, 2.64 +/- 0.35, 2.41 +/- 0.21 and 2.74 +/- 0.35 respectively. For the system CuDCTA(2-) + en no ternary complex was observed, instead Cu(en)(2)(2+) was formed. No reaction was found for the systems CoEDTA(2-) + N(3)(-), CoDCTA(2-) + N(3)(-), NiDCTA(2-) + en, NiDCTA(2-) + phen, NiEDTA(2-) + phen, NiDCTA(2-) + N(3)(-), NiEDTA(2-) + N(3)(-), CrEDTA(-) + NH(3), CrEDTA(-) + CN(-), CuEDTA(2-) + N(3) and CuEDTA(2-) + N(3)(-). The systems CoEDTA(2-) + en and CoDCTA(2-) + en involve more than one equilibrium. The absorption spectra of the ternary complexes between 500 and 850 nm are reported.
Korsse
J
J
National Institute for Nuclear Physics and High-Energy Physics Research [NIKHEF, Section K (formerly IKO)], P.O. Box 4396, 1009 AJ Amsterdam, The Netherlands.
Pronk
L A
LA
Van Embden
C
C
Leurs
G
G
Louwrier
P W
PW