5 documents found, page 1 of 1
New Europium(III)-TTA Complex Containing 2-Pyrrolidone as Coligand to Applicati...
Macrino,Clebson J.; Borges,Alex S.; Cunha Neto,Álvaro; Lacerda Jr.,Valdemar; Romão,WandersonThis work describes the synthesis and application of an europium(III) complex, [Eu(TTA)3(2-pyr) (H2O)], containing 2-thenoyltrifuoroacetonate (TTA) and 2-pyrrolidone (2-pyr) as ligands, obtained as white solid and soluble in ethanol. In solution, the complex showed red emission, characteristic of the EuIII emission in the solid state (λexc = 375 nm and λem = 612 nm). The complex was tested with PbII, CdII, and ...
Synthesis, Characterization, and Application of Europium(III) Complexes as Lumi...
Macrino,Clebson J.; Silva,Elias M.; Cunha,Victor R.; Fonseca,Victor R.; Cunha Neto,Álvaro; Araújo,Joyce R.; Lacerda Jr.,Valdemar; Romão,WandersonIn this work, three complexes were synthesized from the trivalent europium ion (EuIII), using the picrate anion (pic), and delta-valerolactam (DVL), epsilon-caprolactam (EPK), and oenantholactam (OEN). The synthesized complexes [Eu(pic)3·(DVL)3], [Eu(pic)3·(EPK)3], and [Eu(pic)3·(OEN)3] were studied as luminescent markers for application as security elements in Brazilian banknotes. All complexes showed red colo...
Synthesis of New Phenolic-Schiff Base and Its Application as Antioxidant in Soy...
Martins,Lucas F.; Cubides-Román,Diana C.; Silveira,Vivian C. da; Aquije,Glória M. F. V.; Romão,Wanderson; Santos,Reginaldo B. dos; Cunha Neto,ÁlvaroNew Schiff base compound N, N’-bis-(4-hexadecanate)-salicylethylenediamine (named IM) was synthesized, and characterized via infrared and nuclear magnetic ressonance spectroscopies. IM was tested as corrosion inhibitor and antioxidant in soybean biodiesel. Corrosion studies were developed with AISI 1020 carbon steel in a three-step accelerated corrosion assay and IM inhibitory activity was evaluated using micro...
Isolation, Absolute Configuration and Cytotoxic Activities of Alkaloids from Hi...
Lianza,Mariacaterina; Verdan,Maria Helena; Andrade,Jean Paulo de; Poli,Ferruccio; Almeida,Larissa C. de; Costa-Lotufo,Leticia V.; Cunha Neto,ÁlvaroThe phytochemical study of Hippeastrum goianum led to the identification of 13 compounds by means of gas chromatography-mass spectrometry (GC-MS) and nuclear magnetic resonance (NMR). Compounds 7-demethoxy-9-O-methylhostasine (1) and 7-deoxi-trans-dihydronarciclasine (2) had their absolute configurations determined by vibrational circular dichroism (VCD). This is the first time that compound 1 is described in t...
SÍNTESE E DETERMINAÇÃO DA ESTEREOQUÍMICA RELATIVA DE UM NOVO EPÓXIDO ALDEÍDO CI...
Santos,Reginaldo B. dos; Cunha Neto,Álvaro; M. Junior,Elizeu de Souza; Lacerda Jr.,Valdemar; Greco,Sandro J.; Leite,Júlia de Almeida; Faria,Bruna B. deIn this study, we report the preparation of a new tetra-substituted epoxide aldehyde cyclopentane, which acts as a starting material for the synthesis of plinol, from (R)-(+)-epoxy-limonene. The synthesis was performed in three steps and resulted in a good yield. The structural determination was performed by 1H and 13C NMR, and the relative stereochemistry was defined by nuclear Overhauser effect (NOE) experime...