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Cation coordination...
Cation coordination and hydrogen bonding in potassium and magnesium based-di-amidosil hybrids
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- Nunes, S. C. (författare)
- Universidade de Tras-os-Montes e Alto Douro,University of Trás-os-Montes and Alto Douro
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- Bermudez, V. D. (författare)
- Universidade de Tras-os-Montes e Alto Douro,University of Trás-os-Montes and Alto Douro
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- Ostrovskii, Denis, 1967 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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Carlos, L. D. (författare)
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- Silva, M. M. (författare)
- Universidade do Minho,University of Minho
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- Smith, M. J. (författare)
- Universidade do Minho,University of Minho
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(creator_code:org_t)
- Elsevier BV, 2008
- 2008
- Engelska.
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Ingår i: Journal of Molecular Structure. - : Elsevier BV. - 0022-2860. ; 874:1-3, s. 128-137
- Relaterad länk:
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http://dx.doi.org/10...
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http://repositorium....
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https://doi.org/10.1...
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https://research.cha...
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Abstract
Ämnesord
Stäng
- Fourier transform mid-infrared and Raman spectroscopies were employed to elucidate the cation/alkylene chains, cation/cross-link, cation/anion interactions and hydrogen bonding occurring in amorphous di-amide cross-linked alkylene/siloxane hybrid materials (diamidosils) doped with potassium and magnesium triflates (KCF3SO3 and Mg(CF3SO3)(2), respectively). Materials with compositions infinity > n >= 5 (where it expresses the molar ratio of carbonyl oxygen atoms per guest cation) were investigated. The conformations (gauche) of the alkylene chains of the host di-amidosil matrix are not affected by the presence of the guest salt in both doped di-amidosil families. The K+ and M2+ ions coordinate to the carbonyl oxygen atoms of the amide cross-links within the whole range of salt concentration considered, leading to the saturation of the cross-linkages, to a redistribution of the amide-amide hydrogen-bonded aggregates of the host matrix and, in the case of the K+-doped sample with n = 10, to the formation of a new type of aggregate, stronger and more ordered than those detected at lower salt content. In both di-amidosil systems guest salt addition leads to the increase of ionic associated species and to a concomitant decrease of the concentration of "free" anions. (c) 2007 Elsevier B.V. All rights reserved.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Annan teknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Other Engineering and Technologies (hsv//eng)
Nyckelord
- di-amidosils
- FT-Raman
- magnesium and potassium triflates
- BANDS
- sol-gel process
- ENVIRONMENT
- INFRARED TEMPERATURE
- FT-IR
- POLYMERS
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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