Solution studies of some new oxamides - co-ordination behaviour towards Cu(II) ions.
The co-ordination chemistry of some new oxamides towards Cu(II) ions was studied using various techniques: potentiometry, voltammetry, spectroscopy (UV-Vis, CD and EPR) and ESI-MS spectrometry. All tested compounds chelate the copper(II) ions with formation of 1:1 and 1:2 (metal-to-ligand ratio) complexes. The Cu(II) ions are bound by 1N, 2N or 3N nitrogen donor systems. Additionally, an unusual co-ordination to amide N-atoms without additional anchoring site is suggested. The (14)N hyperfine splitting observed for the system ox6-Cu(II) above pH 10 clearly indicates the involvement of at least three N donor atoms in the copper ion binding. Moreover, the surrounding by three amide-N and one carbonyl-O stabilizes the high oxidation state of copper(III), although such complexes are very unstable in solution.
Dobosz
Agnieszka
A
Department of Basic Medical Sciences, Wroclaw Medical University, Kochanowskiego 14, 51-601Wrocław, Poland. adob@basmed.am.wroc.pl
Spychała
Jan
J
Kozłowski
Henryk
H
Rowińska
Magdalena
M
Temeriusz
Andrzej
A
Frauendorf
Holm
H
Meyer
Franc
F
D000577:Amides / Q000737:chemistry*; D002412:Cations; D003300:Copper / Q000737:chemistry*; D004563:Electrochemistry; D010084:Oxidation-Reduction; D012996:Solutions; D013057:Spectrum Analysis / Q000379:methods
D000577:Amides; D002412:Cations; D012996:Solutions; D003300:Copper