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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...
Luminescent polyoxotungstoeuropate anion-pillared layered double hydroxides
Sousa, Filipa L.; Pillinger, Martyn; Ferreira, Rute A. Sá; Granadeiro, Carlos M.; Cavaleiro, Ana M. V.; Rocha, João; Carlos, Luís D.; Trindade, TitoNovel luminescent polyoxometalate anion-pillared layered double hydroxides (LDHs) were prepared by aqueous ion exchange of a Zn–Al LDH precursor in nitrate form with the europium-containing polyoxotungstate anions [EuW10O36]9–, [Eu(BW11O39)(H2O)3]6– and [Eu(PW11O39)2]11–. The host– guest interaction has a strong influence on the nature of the final intercalated species, as evidenced by elemental analy- Introduc...
Lanthanopolyoxotungstates in silica nanoparticles: multi-wavelength photolumine...
Granadeiro, Carlos M.; Ferreira, Rute A. S.; Soares-Santos, Paula C. R.; Carlos, Luís D.; Trindade, Tito; Nogueira, Helena I. S.Photoluminescent lanthanopolyoxotungstate core/shell nanoparticles are prepared by the encapsulation of lanthanide-containing polyoxometalates (POMs) with amorphous silica shells. The preparation of morphological well-defined core/shell nanoparticles is achieved by the hydrolysis of tetraethoxysilane in the presence of POMs using a reverse microemulsion method. The POMs used are decatungstolanthanoates of [Ln(W...
IR, Raman and SERS spectra of 2-(methoxycarbonylmethylsulfanyl)-3,5-dinitrobenz...
Raj,Asha; Raju,K.; Varghese,Hema Tresa; Granadeiro,Carlos M.; Nogueira,Helena I. S.; Panicker,C. Yohannan2-(Methoxycarbonylmethylsulfanyl)-3,5-dinitrobenzenecarboxylic acid was prepared by nucleophilic substitution. FT-IR and FT-Raman spectra of 2-(methoxycarbonylmethylsulfanyl)-3,5-dinitrobenzenecarboxylic acid were recorded and analyzed. Surface enhanced Raman scattering (SERS) spectrum was recorded on a silver colloid. The vibrational wavenumbers were computed by density functional theoretical (DFT) computation...
Nanoencapsulation of luminescent 3-hydroxypicolinate lanthanide complexes
Iwu, Kingsley O.; Soares-Santos, Paula C. R.; Nogueira, Helena I. S.; Carlos, Luis D.; Trindade, TitoWe have synthesized luminescent nanoparticles comprising a core of lanthanide complexes and shells of amorphous silica using reverse micelles as nanoreactors. 3-Hydroxypicolinate complexes of Eu(III), Tb(III), and the corresponding heteronuclear complexes have been investigated as the photoactive cores. The size of the silica particles is within the nanometer scale, which, together with the ability for surface ...
Tetrabutylammonium 2,6-dihydroxybenzoate 2,6-dihydroxybenzoic acid solvate
Paz, Filipe A. Almeida; Soares-Santos, Paula C. R.; Nogueira, Helena I. S.; Trindade, Tito; Klinowski, JacekThe title compound, C16H36N+ C7H5O4 ÿ C7H6O4 or (nBu4N)+ (2,6-dhb) ÿ (2,6±Hdhb) [where (nBu4N) is tetrabutylammonium, (2,6-dhb) ÿ is 2,6-dihydroxybenzoate and (2,6-Hdhb) is 2,6-dihydroxybenzoic acid], crystallizes in the space group P1. The crystal structure involves alternate layers, in the c direction, of cationic [nBu4N]n n+ and anionic [(2,6- dhb)(2,6-Hdhb)]n nÿ . Hydrogen bonds within the anionic layers fo...
Adsorption of 2,2 '-dithiodipyridine as a tool for the assembly of silver nanop...
Nogueira, Helena I. S.; Soares-Santos, Paula C. R.; Cruz, Sandra M. G.; Trindade, TitoSilver nanostructured thin films stabilized by 2,2’-dithiodipyridine (2dtpy) were prepared. The Ag nanoparticles were obtained by treating the complex [Ag(2dtpy)]NO3 with NaBH4 in a methanol–toluene mixture. The films were transferred to borosilicate glass slips by a dip-coating method and were found to consist of Ag nanoparticles possibly linked via 2dtpy molecules. Surface-enhanced Raman scattering (SERS) stu...
Use of dialkyldithiocarbamato complexes of bismuth(III) for the preparation of ...
Monteiro, Olinda C.; Nogueira, Helena I. S.; Trindade, Tito; Motevalli, MA range of bismuth(III) dithiocarbamato complexes were prepared and characterized. The X-ray crystal structures of the compounds [Bi{S2CN(CH3)(C6H13)}3] (1) and [Bi{S2CN(CH3)- (C6H13)}3(C12H8N2)] (2) are reported. The preparation of Bi2S3 particulates using a wet chemical method and involving the thermalysis of Bi(III) dialkyldithiocarbamato complexes is described. The influence of several experimental paramete...
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