Unusual complexing properties of 2-(2'-pyridyl)- and 2-hydrazino-8-hydroxyquinoline.
The ligands 2-(2'-pyridyl)- and 2-hydrazino-8-hydroxyquinoline form terdentate complexes with a 5,5-bicyclic ring system, the stabilities being greater than those of the corresponding 8-hydroxyquinolinates. This study affords a more complete picture of the behaviour of terdentate 2-substituted 8-hydroxyquinolines. Solutions of these ligands and metal ions are complicated by formation of the protonated species MHL(2+), M(HL)(2+)(2) and MLHL(+). The existence of the protonated species is dependent not only on pH and ligand:metal-ion molar ratio but also on the nature of the metal ion itself.
Corsini
A
A
Department of Chemistry, McMaster University, Hamilton, Ontario, Canada.
Cassidy
R M
RM