Wydział Chemii

D. Kroczewska

K. Bogusz

Barbara Kurzak

Julia Jezierska

2002

Polyhedron

21

295-303

10.1016/S0277-5387(01)01001-4

Naukowa

Angielski

Artykuł

Stabilities of the mixed-ligand complexes of Cu²⁺ ion with N,N,N′,N″,N″-pentamethyldiethylenetriamine [N,N,N′,N″,N″-pentamethyl-{bis(2-aminoethyl)amine}, Me₅dien] as a primary ligand and α-alaninehydroxamic acid [2-amino-N-hydroxypropanamid, α-Alaha] or β-alaninehydroxamic acid [3-amino-N-hydroxypropanamid, β-Alaha] as a secondary ligand L and their absorption and EPR spectra at various pH values are reported. The visible spectra exhibit a characteristic red shift and a shoulder at lower energies indicating a five-coordinate structure of the formed complexes. The change of the EPR spectral parameters as a function of pH reflects two modes of an equatorial–axial chelation by the aminohydroxamic acid ligand L in the [Cu(Me₅dien)(HL)]²⁺ and [Cu(Me₅dien)(L)]⁺ species.
Stabilities of the mixed-ligand complexes with the tridentate amine as a primary ligand and α- or β-alaninehydroxamic acid as a secondary ligand, their absorption and EPR spectra indicating a five coordinating structure of the formed complexes. A decrease of symmetry of the simple complexes generally results in an increase of thermodynamic stability and distortion of the coordination geometry of the mixed-ligand complexes.

Copper(II) complexes, Mixed-ligand complexes, Five-coordinate complexes, Aminohydroxamic acids, EPR spectra, Vis spectra

https://doi.org/10.1016/S0277-5387(01)01001-4

http://www.elsevier.com