Replacement of H-bonded bridged water by transition metal ions in poly(1-vinylimidazole-co-methylmethacrylate) copolymers: A vibrational spectroscopy study using mid-FTIR, far-FTIR and ab initio calculations
Journal article, 2012
A detailed structural analysis of the vibrational spectra of hydrophobic PVM (poly(1-vinylimidazole-co-methylmethacrylate)) copolymers PVM-4 (4 wt% 1-VIm) and PVM-44 (44 wt% 1-VIm) is provided with respect to bridging water and subsequent replacement by bridging transition metal ions. PVM-44 (44 wt% 1-VIm) with a high fraction of 1-VIm forms water bridges as evident by the water bending vibration, which is shifted up to 1665 cm(-1). This band vanishes as transition metal ions are introduced and a new band at 952 cm(-1) appears which is ascribed as a delta(ring) band involving the entire [M(Im)(n)](2+) unit. This fact is affirmed using ab initio calculations. The transition metal ions coordinate exclusively the imidazole groups. Although the imidazole associated water is replaced by transition metal ions, the amount of sorbed water for the very hydrophobic PVM-4 is increased as indicated by the nu(OH) region.
coordination
1-
chemistry
coatings
Bridged water
monomers
spectra
containing polymers
histidine
chelating resins
release
B3LYP hybrid functional
imidazole complexes
Methyl methacrylate
Author
Markus Andersson Trojer
Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry
SuMo Biomaterials
Anders Mårtensson
Chalmers, Chemical and Biological Engineering, Polymer Technology
Magnus Nydén
Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry
SuMo Biomaterials
Vibrational Spectroscopy
0924-2031 (ISSN)
Vol. 61 38-42Subject Categories
Chemical Sciences
DOI
10.1016/j.vibspec.2012.02.017