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.
1-
monomers
imidazole complexes
containing polymers
release
coatings
coordination
histidine
chemistry
Bridged water
Methyl methacrylate
chelating resins
B3LYP hybrid functional
spectra
Author
Markus Andersson Trojer
SuMo Biomaterials
Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry
Anders Mårtensson
Chalmers, Chemical and Biological Engineering, Polymer Technology
Magnus Nydén
SuMo Biomaterials
Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry
Vibrational Spectroscopy
0924-2031 (ISSN)
Vol. 61 38-42Subject Categories (SSIF 2011)
Chemical Sciences
DOI
10.1016/j.vibspec.2012.02.017