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Effect of high-energy milling and sintering temperature on the structure of a h...
Batista, Adriano Corrêa; Oliveira, Hellen Cristine Prata de; Filgueira, Marcello; Pinto, Maria Aparecida; Faria, Geraldo Lúcio deThis paper evaluated the effect of high-energy milling and sintering temperature on the structural characteristics of WC- 10%Co. These samples were sintered at temperatures of 1350°C, 1400°C and 1450°C. The cooling rate of 100°C/h was used within the temperature range of 1000°C and 800°C to relieve residual stress from the sintering process. The samples were submitted to X-ray diffraction analysis with Rietveld...
Growth and characterization of potassium cobalt nickel sulfate hexahydrate crys...
Pacheco, Tiago de Sousa; Ghosh, Santunu; Oliveira, Michelle de; Barbosa, Ananias Alves; Perpétuo, Genivaldo Julio; Franco, Carlos JoelSamples of the empirical formula Kþ 2 Ni2þ x Co2þ ð1 xÞ ðSO4Þ 2,6H2O were grown with a partial occupation of the cations Co and Ni. Mixed crystals with good optical quality were obtained by the slow evaporation growth method. In the decomposition process, these crystals suffer a mass loss of approximately 24%, equivalent to water molecules forming octahedral coordination ions of Ni and Co. The optical character...
Structural and spectroscopic characterization of 1-(diaminomethylene) thiouron-...
Perpétuo, Genivaldo Julio; Janczak, JanTwo single crystals of 1-(diaminomethylene) thiouron-1-ium benzoate (1) and bis(1-(diaminomethylene) thiouron-1-ium) phthalate trihydrate (2) were grown using a solution growth technique. The compound 1 crystallises in the centrosymmetric P21/c space group of the monoclinic system, whereas the compound 2 in the centrosymmetric Pbcn space group of orthorhombic system. The solid-state organisation of 1 and 2 has ...
Supramolecular hydrogen-bonding network in 1-(diaminomethylene)thiouron-1-ium 4...
Perpétuo, Genivaldo Julio; Gonçalves, Rafael Silva; Janczak, JanThe single crystals of 1-(diaminomethylene)thiouron-1-ium 4-hydroxybenzenesulfonate were grown using a solution growth technique. The compound crystallises in the centrosymmetric P21/c space group of the monoclinic system. The conformation of the 1-(diaminomethylene)thiouron-1-ium cation is not strictly planar, but twisted. Both arms of the cation are oppositely rotated by 8.5(1)_ around the CAN bonds involving...
Syntheses, structural and spectroscopic characterization of novel zinc(II)-bis(...
Tavares, Eder do Couto; Oliveira, Marcelo Ribeiro Leite; Janczak, Jan; Vieira, Camila Grossi; Alves, Leandro de Carvalho; Castro, Rodrigo AntunesFour zinc(II)-bis(trithiocarbimato) complexes with the general formula A2[Zn(RSO2N@CS3)2] [A= Ph4P+: R = CH3 (1), 4-CH3C6H4 (2); A = Bu4N+: R = CH3 (3), 4-CH3C6H4 (4)] were obtained by the reaction of sulfur with the correspondent zinc(II)-bis(dithiocarbimato) complexes. Additionally, the compound (Ph4P)2[(CH3SO2N@CS2)2S)] (5) was prepared from the potassium methylsulfonildithiocarbimate by oxidation with iodin...
Structural and spectroscopic characterisation of bis[1-(diaminomethylene)thiour...
Janzac, Jan; Perpétuo, Genivaldo JulioThe single crystals of bis[1-(diaminomethylene)thiouron-1-ium] fumarate were grown using a solution growth technique. The compound crystallises in the centrosymmetric P21/c space group of the monoclinic system. The conformation of the 1-(diaminomethylene)thiouron-1-ium cation is not strictly planar, but twisted. Both arms of the cation are oppositely rotated by 13.8(1)_ around the CAN bonds involving the centra...
Syntheses, crystal structure and spectroscopic characterization of novel N-R-su...
Oliveira, Marcelo Ribeiro Leite; Vieira, Heulla P.; Perpétuo, Genivaldo Julio; Janczak, Jan; Bellis, Vito M. DeThree new complexes of the general formula: [Ni(PPh3)2(RSO2N_/CS2)] where R_/2-CH3C6H4 (1), 4-CH3C6H4 (2) and 4-BrC6H4 (3) were obtained in crystalline form by the reaction of the appropriate potassium N-R-sulfonyldithiocarbimates (K2(RSO2N_/CS2)) and triphenylphosphine with nickel(II) chloride in ethanol_/water. The 1 complex crystallizes in the centrosymmetric space group of the triclinic system with two mole...
Synthesis, structural and spectroscopic characterization of novel zinc(II) comp...
Oliveira, Marcelo Ribeiro Leite; Perpétuo, Genivaldo Julio; Janczak, Jan; Rubinger, Mayura Marques MagalhãesTwo new zinc(II)-complexes, dithiocarbimato (Ph4P)2[Zn(CH3SO2N@CS2)2] (1) and trithiocarbimato (Ph4P)2[Zn(CH3SO2N@CS3)2] (2), were obtained in the crystalline form by the reaction of potassium N-methylsulfonyldithiocarbimate (RSO2N@CS2K2) with zinc(II) acetate dihydrate and tetraphenylphosphonium chloride in dimethylformamide. Both complexes crystallize in the monoclinic system. The central Zn(II) ion has a dis...
Synthesis, crystal structure and charge transport properties of one-electron ox...
Janczak, Jan; Perpétuo, Genivaldo JulioCrystals of the new one-electron oxidized zirconium diphthalocyanine, [ZrPc2]IBr2 (Pc = C32H16N8) were grown directly from phthalonitrile and pure zirconium powder under the oxidation conditions of IBr at 220 _C. [ZrPc2]IBr2 crystallises in the space group P21/m of the monoclinic system, with lattice parameters of: a = 6.697(1), b = 25.483(5), c = 16.918(3)A ˚ , b = 100.03(3)_ and Z = 2. The crystals of [ZrPc2]...
Syntheses, crystal structure and spectroscopic characterization of new platinum...
Amim, Raquel S.; Oliveira, Marcelo Ribeiro Leite; Perpétuo, Genivaldo Julio; Janczak, Jan; Miranda, Liany Divina LimaThe reaction of 4-iodobenzenesulfonamide or 4-fluorobenzenesulfonamide with CS2 and KOH in dimethylformamide yielded the potassium N-R-sulfonyldithiocarbimates, K2(RSO2N@CS2) [R = 4-IC6H4 (1) and 4-FC6H4 (2)]. These salts reacted with K2[PtCl4] in water/methanol to yield complex anions bis(N-R-sulfonyldithiocarbimato) platinate(II), which were isolated as their tetrabutylammonium salts, (Bu4N)2[Pt(RSO2N@CS2)2] ...