TY - JOUR
T1 - Binary and ternary copper(II) complexes with NIPAAm/IA copolymers and aminoacids
T2 - Interpretation of UV-visible spectra and cyclic voltammograms
AU - Erbil, Candan
AU - G̈kçeören, Argun Talat
AU - Sezer, Esma
PY - 2007/5
Y1 - 2007/5
N2 - The complex formations of homopolymers and copolymers of poly(N-isopropyl acrylamide) (PNIPAAm), polyacrylamide (PAAm) and poly(itaconic acid) (PIA) with Cu(II) ions in aqueous solutions were studied by using UV-visible spectra in the region of 200-1100nm and cyclic voltammograms between -0.800V and 0.600V. According to the optical and electrochemical spectra of the polymer- and copolymer-Cu(II) complexes and their ternary complexes with alanine, i.e., absorptions and the shifts in the wavelength of the maximum absorptions, currents and potentials of the peaks in the pH range of 3-12, the intensities of anodic and cathodic peak currents of polymers containing IA groups decrease with increasing pH and they show maximum absorptions at lower wavelengths than do the homopolymers used in this work. The peak point of the visible band shifts from 800 to 650nm, with increasing pH, while the intensity of the third anodic peak observed after pH=4 increases in the case of both Ala-Cu(II) and its ternary solution with P(NIPAAm-co-IA, 9.8mol%). Both the pH-dependent shifts of maximum absorptions and the appearence of the third anodic peaks as the pH raised were interpreted as a presence of tetracoordinated Cu(II) complexes in the solution and on the electrode surface, involving combined carboxyl, amide and amine interaction.
AB - The complex formations of homopolymers and copolymers of poly(N-isopropyl acrylamide) (PNIPAAm), polyacrylamide (PAAm) and poly(itaconic acid) (PIA) with Cu(II) ions in aqueous solutions were studied by using UV-visible spectra in the region of 200-1100nm and cyclic voltammograms between -0.800V and 0.600V. According to the optical and electrochemical spectra of the polymer- and copolymer-Cu(II) complexes and their ternary complexes with alanine, i.e., absorptions and the shifts in the wavelength of the maximum absorptions, currents and potentials of the peaks in the pH range of 3-12, the intensities of anodic and cathodic peak currents of polymers containing IA groups decrease with increasing pH and they show maximum absorptions at lower wavelengths than do the homopolymers used in this work. The peak point of the visible band shifts from 800 to 650nm, with increasing pH, while the intensity of the third anodic peak observed after pH=4 increases in the case of both Ala-Cu(II) and its ternary solution with P(NIPAAm-co-IA, 9.8mol%). Both the pH-dependent shifts of maximum absorptions and the appearence of the third anodic peaks as the pH raised were interpreted as a presence of tetracoordinated Cu(II) complexes in the solution and on the electrode surface, involving combined carboxyl, amide and amine interaction.
KW - Cyclic voltammetry
KW - Poly(itaconic acid)
KW - Poly(N-isopropyl acrylamide)
KW - Polymer-copper(II) complexes
KW - Ternary complexes
KW - UV-visible spectroscopy
UR - http://www.scopus.com/inward/record.url?scp=33947267665&partnerID=8YFLogxK
U2 - 10.1080/10601320701235792
DO - 10.1080/10601320701235792
M3 - Article
AN - SCOPUS:33947267665
SN - 1060-1325
VL - 44
SP - 525
EP - 534
JO - Journal of Macromolecular Science - Pure and Applied Chemistry
JF - Journal of Macromolecular Science - Pure and Applied Chemistry
IS - 5
ER -