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Near-infrared luminescent and magnetic cyano-bridged coordination polymers Nd(p...
Long, J.; Chelebaeva, E.; Larionova, J.; Guari, Y.; Ferreira, R. A. S.; Carlos, L. D.; Paz, F. A. A.; Trifonov, A.; Guerin, C.New cyano-bridged coordination polymers [Nd(phen)(2)(DMF)(2)(H(2)O)Mo(CN)(8)] center dot 2H(2)O (1) and [Nd(phen)(DMF)(5)M(CN)(8)] center dot xH(2)O [M = Mo (2), W (3); phen = 1,10-phenanthroline] have one-dimensional structures with variable number of phenanthroline ligands. Compounds exhibit photoluminescence in the near-infrared region and ferromagnetic Nd(3+)-M(5+) interactions.
Self-structuring of lamellar bridged silsesquioxanes with long side spacers
Fernandes, M.; Nobre, S. S.; Xu, Q. H.; Carcel, C.; Cachia, J. N.; Cattoen, X.; Sousa, J. M.; Ferreira, R. A. S.; Carlos, L. D.; Santilli, C. V.Diurea cross-linked bridged silsesquioxanes (BSs) C(10)C(11)C(10) derived from organosilane precursors, including decylene chains as side spacers and alkylene chains with variable length as central spacers (EtO)(3)Si- (CH(2))(10)-Y(CH(2))(n)-Y-(CH(2))(10)-Si(OEt)(3) (n = 7, 9-12; Y = urea group and Et = ethyl), have been synthesized through the combination of self-directed assembly and an acid-catalyzed sol gel...
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...
Comment on trivalent europium lifetimes in the presence of intramolecular energ...
Carlos,L. D.; Faustino,W. M.; Malta,O. L.This work emphasizes the importance of conceptually distinguishing between lifetimes in the absence (natural lifetimes) and in the presence of intramolecular energy transfer processes in lanthanide coordination compounds. It is focused on trivalent europium compounds with mixed ligands, and a case study is made on results recently reported in the literature.
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
Functional nanostructured chitosan–siloxane hybrids
Silva, S. S.; Ferreira, Rute A. S.; Fu, Lianshe; Carlos, L. D.; Mano, J. F.; Reis, R. L.; Rocha, JoãoNew organic–inorganic hybrids were prepared by a sol–gel method from the biopolymer chitosan and a silane coupling agent, 3-isocyanatopropyltriethoxysilane (ICPTES), in which covalent bridges, essentially composed of urea, bond the chitosan to the poly(siloxane) network. The structural characterization of the advanced chitosan–siloxane hybrids was performed by Fourier transform infrared spectroscopy, X-ray diff...
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