Urethane cross-linked poly(oxyethylene)/siliceous nanohybrids doped with Eu3+ ions Part 2. Ionic association

文献情報

出版日 2004-01-12

DOI 10.1039/B308202D

インパクトファクター 3.676

著者

Verónica de Zea Bermudez, Denis Ostrovskii, Sergei Lavoryk, M. Cristina Gonçalves, Luís D. Carlos

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要旨

Fourier transform mid-IR and Raman spectroscopies were employed to investigate the anionic local surrounding in sol–gel derived organic/inorganic materials–monourethanesils–incorporating europium triflate, Eu(CF3SO3)3. The hybrid framework of these xerogels contains short methyl end capped polyether segments grafted to a siliceous network through urethane cross-links. Samples with compositions ∞ > n ≥ 10 (where n indicates the ratio of (OCH2CH2) moieties per lanthanide ion) were examined. The spectral data obtained provide conclusive evidence of the presence of “free” and weakly coordinated CF3SO3− ions located in two distinct sites in the whole range of salt concentration analyzed. At n = 30 and 10, along with these species, two new anionic configurations, assigned to contact ion pairs and “cross-link separated” ions pairs, emerge. Two-dimensional correlation spectroscopic analysis allowed to clarify the number of components present in two critical bands containing strongly overlapped spectral profiles. The number of anionic environments found in the m-Ut(750)nEu(CF3SO3)3 family confirms the rich coordinating possibilities offered by polymer systems incorporating trivalent triflate salts.

掲載誌

Physical Chemistry Chemical Physics

CiteScore: 5.5

自己引用率: 10.3%

年間論文数: 3036

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