Detalhes bibliográficos
| Resumo: | Electrolytes formed with poly(oxyethylene), POE, and europium picrate [Eu(pic)2(OH2)6]pic.6H2O (where pic denotes the picrate anion) or simply Eu(pic)3xH2O, have been represented by POEnEu(pic)3xH2O (where n represents the molar ratio of (OCH2CH2) units per Eu3+ ion). Materials with n ranging from 133 to 11 have been examined. A tentative attribution of the absorption bands of the mid-infrared spectra is presented. The spectral changes detected in the mid-infrared region and the modifications in the XRD patterns at increasing salt content show that PEOnEu(pic)3xH2O exerts an effective plasticizing role which leads to the complete supression of crystallinity at n = 11. The emission spectra of the complexes and their signature in the vC-O spectral region provide conclusive evidence that the Eu3+ ions are coordinated to the oxygen atoms of the polyether chains over the whole range of compositions studied. The photoluminescence spectra of the PEOnEu(pic)3xH2O electrolytes indicate that the Eu3+/ether oxygen complexation occurs with concomittant partial substitution of the water molecules from the cation coordination shell. The luminescence data obtained |
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| Autores principais: | Zea Bermudez, V. de |
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| Outros Autores: | Carlos, Luís; Silva, Maria Manuela; Smith, Michael John |
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| Assunto: | Solid polymer electrolytes Luminescence X-ray diffraction Infrared spectroscopy |
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| Ano: | 2000 |
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| País: | Portugal |
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| Tipo de documento: | artigo |
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| Tipo de acesso: | acesso aberto |
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| Instituição associada: | Universidade do Minho |
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| Idioma: | inglês |
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| Origem: | RepositóriUM - Universidade do Minho |
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