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Synthesis, characterisation and luminescent properties of lanthanide-organic po...
Girginova, Penka I.; Paz, Filipe A. Almeida; Soares-Santos, Paula C. R.; Ferreira, R. A. Sá; Carlos, Luís D.; Amaral, Vítor S.; Klinowski, JacekThree new lanthanide(III) complexes (Ln = Sm, Tb and Eu) of picolinic and glutaric acid were prepared and characterised. The crystal structure of the complex [Sm(glu)(pic)- (H2O)2] (where Hpic and H2glu stand for picolinic and glutaric acid, respectively) was determined by single-crystal Xray diffraction. All the Ln complexes were characterised by elemental analysis, infrared spectroscopy, X-ray powder diffract...
K+-doped poly(gamma-caprolactone)/siloxane biohybrid electrolytes for electroch...
Fernandes, M.; Rodrigues, L. C.; Ferreira, R. A. Sá; Gonçalves, A.; Fortunato, E.; Silva, Maria Manuela; Smith, Michael John; Zea Bermudez, V. deIn Press; available online 10 November 2011 ; Sol-gel derived KCF3SO3-doped di-urethane cross-linked poly(ε-caprolactone) (PCL(530))/siloxane ormolytes with ∞ > n ≥ 0.5 (n indicates the number of (C(=O)(CH2)5O) repeat units per K+ ion) have been studied. Xerogel samples with n ≥ 1 are thermally stable up to 235 ºC. A minor proportion of PCL crystallites occur in some dilute-to-concentrated samples. At n ≤ 4 a ...
Structure, thermal properties, conductivity and electrochemical stability of di...
Gonçalves, M. C.; Zea Bermudez, V. de; Silva, Maria Manuela; Smith, Michael John; Morales, Enrique; Ferreira, R. A. Sá; Carlos, L. D.Variable chain length di-urethane cross-linked poly(oxyethylene) (POE)/siloxane hybrid networks were prepared by application of a sol-gel strategy. These materials, designated as di-urethanesils (represented as d-Ut(Y’), where Y’ indicates the average molecular weight of the polymer segment), were doped with lithium triflate (LiCF3SO3). The two host hybrid matrices used, d-Ut(300) and d-Ut(600), incorporate POE...
Interconvertable modular framework and layered lanthanide(III)-etidronic acid c...
Shi, F. N.; Cunha-Silva, L.; Ferreira, R. A. Sá; Mafra, L.; Trindade, T.; Carlos, L. D.; Paz, F. A. Almeida; Rocha, J.POCI/QUI/58377/2004 - FEDER ; SFRH/BPD/9309/2002 (to F.-N.S.) ; SFRH/BPD/14410/2003 (to L.C.-S.) ; NoE FAME
Structure and photoluminescence of di-amidosil nanohybrids incorporating europi...
Nunes, Sílvia; Zea Bermudez, V. de; Cybinska, J.; Ferreira, R. A. Sá; Carlos, Luís; Legedziewicz, J.; Silva, Maria Manuela; Smith, Michael JohnThe sol–gel process was used to prepare amorphous di-amide cross-linked alkyl/siloxane hybrid materials (di-amidosils) incorporating europium triflate (Eu(CF3SO3)3). Samples with 200 ≤ n ≤ 8 (where n is the molar ratio of carbonyl oxygen atoms per Eu3+ ion) were studied. The conformations of the alkyl chains of the host matrix in the doped di-amidosils (essentially gauche) are not affected by the presence of th...
Study of sol-gel derived di-ureasils doped with zinc triflate
Nunes, Sílvia; Zea Bermudez, V. de; Silva, Maria Manuela; Smith, Michael John; Morales, Enrique; Ferreira, R. A. Sá; Carlos, Luís; Rocha, JoãoProva tipográfica (In Press) ; A publicar em "Solid States Sciences". ; Zinc triflate (Zn(CF3SO3)2)-doped sol-gel derived di-urea cross-linked POE/siloxane ormolytes (designated as di-ureasils) with ∞ > n ≥ 1 (where the salt content is expressed as n, the molar ratio of oxyethylene moieties to Zn2+ ions) were investigated. The hybrids with n ≥ 5 are entirely amorphous; those with n > 10 are thermally stable u...
Structure and photoluminescent features of di-amide cross-linked alkylene-silox...
Nunes, Sílvia; Zea Bermudez, V. de; Cybinska, J.; Ferreira, R. A. Sá; Carlos, Luís; Silva, Maria Manuela; Smith, Michael John; Ostrovskii, DavidNovel amide cross-linked alkylene/siloxane hybrid materials (di-amidosils) synthesized by the sol-gel process have been investigated. Two samples identified by the notation d-A(x) with x = 4 and 8 (where x is the number of methylene groups of the alkylene chain) have been produced as transparent, amorphous, rigid monoliths, thermally stable up to about 381 and 400 ºC, respectively. In the d-A(8) hybrid the sili...
Sol-gel derived Li+-doped poly(ε-caprolactone)/siloxane biohybrid electrolytes
Nunes, Sílvia; Zea Bermudez, V. de; Silva, Maria Manuela; Smith, Michael John; Morales, Enrique; Carlos, Luís; Ferreira, R. A. Sá; Rocha, JoãoElectrolytes based on a poly(ε-caprolactone) (PCL)/siloxane organic/inorganic host framework doped with lithium triflate (LiCF3SO3) were synthesised through the sol-gel process. In this biohybrid matrix short PCL chains are covalently bonded via urethane linkages to the siliceous network. Samples with salt composition n (molar ratio of PCL repeat units per Li+ ion) ranging from ∞ to 0.5 were investigated. All t...
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