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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...
Synthesis of 3-indolylazoles and meridianin derivatives from indolyl enaminonit...
Campos, Ana M. F. Oliveira; Salaheldin, Abdellatif M.; Paz, Filipe A. Almeida; Rodrigues, Lígia M.The reaction of indole derivatives with cyanoacetic acid followed by treatment with DMFDMA gave the intermediate indolyl enaminonitriles (3). Further reaction with aminoguanidine yielded 5´-cyanomeridianin analogues (4). The same intermediate reacted with p-methoxyphenylhydrazine to give the pyrazolyl derivative (8). Treatment of (2E)-3-dimethylamino-2-(1H-indol-3-yl)-propenoate (3a) with hydroxylamine hydrochl...
Three-dimensional lanthanide-organic frameworks based on di-, tetra-, and hexam...
Shi, Fa-Nian; Cunha-Silva, Luis; Trindade, Tito; Paz, Filipe A. Almeida; Rocha, JoaoThree-dimensional lanthanide-organic frameworks formulated as (CH3)2NH2[Ln(pydc)2] · 1/2H2O [Ln3+ ) Eu3+ (1a) or Er3+ (1b); pydc2- corresponds to the diprotonated residue of 2,5-pyridinedicarboxylic acid (H2pydc)], [Er4(OH)4(pydc)4(H2O)3] ·H2O (2), and [PrIII 2PrIV 1.25O(OH)3(pydc)3] (3) have been isolated from typical solvothermal (1a and 1b in N,N-dimethylformamide - DMF) and hydrothermal (2 and 3) syntheses....
Thermal and structural analysis of 4,5,6-trimethoxyisatin
Campos, Ana M. F. Oliveira; Rodrigues, Lígia M.; Francisco, Carla Santana; Oliveira, M. J.; Silva, Maria Manuela; Smith, Michael John4,5,6-Trimethoxyisatin was crystallized from water to give dark red needles that were characterized by NMR and IR spectroscopy, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), single-crystal X-ray diffraction (XRD) and hot-stage microscopy.
Structural Studies on Supramolecular Adducts of Cyclodextrins with the Complex ...
Marques, Joana; Anjo, Lucia; Marques, Maria P. M.; Santos, Teresa M.; Paz, Filipe A. Almeida; Braga, Susana S.http://www.sciencedirect.com/science/article/B6TGW-4SV5VBS-B/1/da1bbc59614cc3a26a3bdce77219c7c9
Synthesis, structure and magnetic behaviour of mixed metal leucophosphite
Shi, Fa-Nian; Santos, António Moreira dos; Cunha-Silva, Luís; Costa, Benilde F.O.; Klinowski, Jacek; Paz, Filipe A. Almeida; Amaral, Vítor S.A synthetic analogue of leucophosphite, an iron phosphate, was synthesized hydrothermally at 180 °C and its chemical composition determined to be K[(FeV)(PO4)2(OH)(H2O)]·H2O. The compound crystallizes in the monoclinic P21/c space group, with a=9.7210(19) Å, b=9.6500(19) Å, c=12.198(4) Å and [beta]=128.569(18)°. While the original all-iron compound is reported to be antiferromagnetic, the inclusion of substitut...
Photoluminescent Layered Lanthanide Silicate Nanoparticles
Ananias, Duarte; Ferdov, Stanislav; Paz, Filipe A. Almeida; Ferreira, Rute A. Sá; Ferreira, Artur; Geraldes, Carlos F. G. C.; Carlos, Luís D.; Lin, ZhiThe first examples of nanoparticles of pure layered Ln2(SiO4H)(OH)2(H2O)Cl (where Ln ) Eu, Gd, and Tb) and mixed microcrystalline layered lanthanide silicates containing different Eu/Gd and Tb/Gd ratios have been reported. The crystal structure of these silicates has been solved from synchrotron powder X-ray diffraction data. These materials display interesting and tuneable photoluminescence (PL) properties, su...
Complex Formation between Heptakis(2,6-di-O-methyl)-β-cyclodextrin and Cyclopen...
Pereira, Cláudia C. L.; Diogo, Cátia V.; Burgeiro, Ana; Oliveira, Paulo J.; Marques, Maria Paula M.; Braga, Susana S.; Paz, Filipe A. AlmeidaThe inclusion compounds isolated from nonaqueous solutions of heptakis(2,6-di-O-methyl)-β-cyclodextrin (DIMEB) and the complexes [CpMoL2(CO)2](BF4) (L = MeCN, L2 = 2,2′-biimidazole) were characterized in the solid state by powder X-ray diffraction (XRD), thermogravimetric analysis (TGA), 13C1H CP/MAS NMR, and FTIR spectroscopy. Powder XRD showed that the compound with [CpMo(MeCN)2(CO)2](BF4) was amorphous, whil...
Hydro-ionothermal synthesis of lanthanide-organic frameworks with 1,4-phenylene...
Shi, Fa-Nian; Trindade, Tito; Rocha, João; Paz, Filipe A. AlmeidaA synthetic approach combining hydrothermal and ionothermal (eutectic mixture of choline chloride and malonic acid) procedures is proposed that allowed the isolation of the first lanthanide-organic frameworks with residues of 1,4-phenylenebis(methylene)- diphosphonic acid (H4pmd), [Ln(Hpmd)(H2O)] (where Ln3+ ) Ce3+ and Pr3+), exhibiting an unprecedented trinodal topology with 3- and 8-connected nodes. The struc...
Evolution of Photoluminescence across Dimensionality in Lanthanide Silicates
Kostova, Mariya H.; Ananias, Duarte; Paz, Filipe A. Almeida; Ferreira, Artur; Rocha, João; Carlos, Luís D.The dehydratation process of layered lanthanide silicates K3[LnSi3O8(OH)2], Ln = Y, Eu, Tb, and Er, and the structural characterization of the obtained small-pore framework K3LnSi3O9, Ln = Y, Eu, Tb, and Er solids, named AV-23, have been reported. The structure of AV-23 has been solved by single-crystal X-ray diffraction (XRD) methods and further characterized by chemical analysis, thermogravimetry, scanning el...
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