Complexation of 5-fluorosalicylic acid with copper(II): a pH-potentiometric, UV-vis spectroscopic, and electron spin resonance study by the two-dimensional simulation of spectra.
The copper(II)-5-fluorosalicylic acid system was investigated in water and 50 v/v% water-methanol mixture by pH potentiometry combined with UV-vis spectrophotometry, and by the two-dimensional ESR simulation method, respectively. The data revealed that the stable paramagnetic mono- and bis(salicylato) copper(II) complexes [CuLH(-1)] and [CuL2H(-2)](2-) are formed, and at low excess of ligand, the ESR-silent mixed hydroxo complex [Cu2L2H(-3)](-) is also a major species. By the two-dimensional ESR simulation method, the species [CuL]+ in the acidic region, and the minor dimer [Cu2L2H(-2)] were also identified, and the cis and trans isomers of [CuL2H(-2)](2-) were characterized. In frozen solutions, the ESR analysis revealed a slight rhombic distortion of coordination polyhedra for the latter three species.
Szabó-Plánka
Terézia
T
Department of Physical Chemistry, University of Szeged, P.O. Box 105, H-6701 Szeged, Hungary. szabot@chem.u-szeged.hu
Gyurcsik
Béla
B
Nagy
Nóra Veronika
NV
Rockenbauer
Antal
A
Sípos
Rastislav
R
Sima
Jozef
J
Melník
Milan
M
D016880:Anisotropy; D002413:Cations, Divalent / Q000737:chemistry; D003198:Computer Simulation; D003300:Copper / Q000737:chemistry*; D004578:Electron Spin Resonance Spectroscopy; D006863:Hydrogen-Ion Concentration; D011199:Potentiometry; D012459:Salicylates / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet
D002413:Cations, Divalent; D012459:Salicylates; C075234:5-fluorosalicylic acid; D003300:Copper