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1,244 results on '"Ellena, Javier"'

204. Meso-tetra-(4-pyridyl)porphyrin/Palladium(II) Complexes as Anticancer Agents

Author

Alves, Kamilla, primary, Honorato, João, additional, Lião, Luciano Morais, additional, Velozo-Sá, Vivianne de Souza, additional, Pereira Mundim Guedes, Adriana, additional, Dutra, Jocely de Lucena, additional, Ayala, Alejandro Pedro, additional, Ellena, Javier A, additional, Batista, Alzir A, additional, and Gonçalves, Pablo José, additional

Published
2021
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208. Dichloro(diphosphine)(2-pyridylketone)ruthenium(II) complexes

Author

Queiroz, Salete L., Batista, Alzir A., de Araujo, Marcio P., Bianchini, Roberto C., Oliva, Glaucius, Ellena, Javier, and James, Brian R.

Subjects
Benzene -- Chemical properties, Chemical compounds -- Composition, Chemical compounds -- Properties, Chemical compounds -- Structure, Chemical research -- Analysis, Chlorine -- Chemical properties, Coordination compounds -- Chemical properties, Coordination compounds -- Composition, Coordination compounds -- Structure, Pyridine -- Chemical properties, Ruthenium -- Chemical properties, X-ray crystallography -- Usage
Abstract

Described are the synthesis and characterization of Ru(II) complexes of the type Ru[Cl.sub.2][L.sub.2](N-O), where [L.sub.2] is either 1,4-bis (diphenylphosphino)butane (dppb) or [(P[Ph.sub.3]).sub.2], and N-O represents chelated 2-benzoylpyridine (2-bzpy) or 2-acetylpyridine (2-acpy); the Ru presursors used were [Ru[Cl.sub.2][(dppb)].sub.2] ([mu]-dppb) or Ru[Cl.sub.2][(P[Ph.sub.3]).sub.3]. The crystal structure of cis-Ru[C1.sub.2](dppb)(2-bzpy) is presented, and three other Ru[Cl.sub.2][L.sub.2](N-O) complexes with cis-chlorines are isolated and characterized spectroscopically; of the trans-dichloro species, Ru[Cl.sub.2][(P[Ph.sub.3]).sub.2](N-O) complexes are isolated, while the corresponding dppb species are characterized in situ. In all cases, thermodynamically stable cis-complexes are formed from initially formed trans-species. Key words: ruthenium, phosphines, 2-benzoylpyridine, 2-acetylpyridine, X-ray structures.

Published
2003

217. Metal-induced cyclization of thiosemicarbazones derived from beta-keto amides and beta-keto esters: open-chain and cyclized ligands in zinc(II) complexes

Author

Casas, Jose S., Castano, Maria V., Castellano, Eduardo E., Ellena, Javier, Garcia-Tasende, Maria S., Gato, Angeles, Sanchez, Agustin, Sanjuan, Luisa M., and Sordo, Jose

Subjects
Chemistry, Inorganic -- Research, Ligands -- Research, Ring formation (Chemistry) -- Research, Amides, Esters, Zinc compounds, Coordination compounds -- Composition, Chemistry
Abstract

Research has been conducted on the cyclization-elimination reactions. Results indicate that these reactions have been slower with zinc(II) than with cadmium(II) and that the complexes containing either cyclized or uncyclized ligands have been isolated.

Published
2002

220. A novel coordination mode for a pyridylphosphine ligand. X-ray structures of [Ru[Cl.sub.2](NO)L] (I) and [Ru[Cl.sub.2](NO)L]*DMSO (II) (L = [[[(2-py).sub.2]P[C.sub.2] [H.sub.4]POO[(2-py).sub.2].sup.-])

Author

Batista, Alzir A., Queiroz, Salete L., Healy, Peter C., Buckley, Robbie W., Boyd, Sue E., Berners-Price, Susan J., Castellano, Eduardo E., and Ellena, Javier

Subjects
Coordination compounds -- Research, Complex compounds -- Research, Ligands -- Usage, Ruthenium -- Research
Abstract

The ruthenium(II) complex, [Ru[Cl.sub.2](NO)L] (I), (L = [[(2-py).sub.2]P[C.sub.2][H.sub.4]P[O.sub.2](2-py)]-) was obtained from recrystallization of Ru[Cl.sub.3]NO(d2pype) (d2pype = [(2-py).sub.2]P[C.sub.2][H.sub.4]P[(2-py).sub.2]) in the presence of HN[O.sub.3], crystallizing in the monoclinic space group [P2.sub.1] (no. 4), with a = 8.012(4) [Angstrom], b = 14.454(4) [Angstrom], c = 9.353(3) [Angstrom], [beta] = 105.77(3)[degrees], and Z = 2. Crystals of the DMSO solvate of the complex (II) were obtained from [(C[D.sub.3]).sub.2]SO solution, crystallizing in the monoclinic space group [P2.sub.1]/c (no.14) with a = 9.7080(2) [Angstrom], b = 22.2920(5) [Angstrom], c = 11.5230(3) [Angstrom], [beta] = 92.0450(10)[degrees], and Z = 4. In both complexes, the geometry about the ruthenium atom is a distorted octahedron mainly as a result of the tridentate [P,N,O]-bonding mode of L. The v (NO) bands at 1875 [cm.sup-1] in both complexes are consistent with the linear disposition of the NO group and the Ru atom as is observed in the X-ray crystal structure (Ru-N1-O1 angle = 178.5(4)[degrees]). Key words: pyridylphosphine, nitrosyl, ruthenium complex, X-ray structure.

Published
2001

227. Crystal structure, anti-Trypanosoma cruzi and cytotoxic activities of Cu(II) complexes bearing β-diketone and α-diimine ligands

Author

Paixão, Drielly A., primary, de Oliveira, Barbara C.A., additional, Almeida, Janaina do Couto, additional, Sousa, Luana M., additional, Lopes, Carla D., additional, Carneiro, Zumira A., additional, Tezuka, Daiane Y., additional, Clavijo, Juan Carlos T., additional, Ellena, Javier, additional, Polloni, Lorena, additional, Machado, Pedro H.A., additional, de Albuquerque, Sérgio, additional, de Oliveira Júnior, Robson J., additional, Guilardi, Silvana, additional, and Guerra, Wendell, additional

Published
2020
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229. Silver(i) complexes of 3-methoxy-4-hydroxybenzaldehyde thiosemicarbazones and triphenylphosphine: structural, cytotoxicity, and apoptotic studies

Author

Silva, Débora E. S., primary, Becceneri, Amanda B., additional, Santiago, João V. B., additional, Gomes Neto, José A., additional, Ellena, Javier, additional, Cominetti, Márcia R., additional, Pereira, José C. M., additional, Hannon, Michael J., additional, and Netto, Adelino V. G., additional

Published
2020
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230. A giant hybrid organic–inorganic octahedron from a narrow rim carboxylate calixarene

Author

Machado dos Santos, Fernando, primary, Edivirges Alvarenga, Meiry, additional, Valdo, Ana Karoline Silva Mendanha, additional, Rabelo, Renato, additional, Cangussu de Castro Gomes, Danielle, additional, de Fátima, Ângelo, additional, Vinicius Costa Lara, Thiago, additional, da Silva, Cleiton Moreira, additional, Tasso, Thiago Teixeira, additional, Neto, João Honorato Araujo, additional, Batista, Alzir Azevedo, additional, Ayala, Alejandro Pedro, additional, Ellena, Javier Alcides, additional, Ferraz Guimarães, Vinicius, additional, Maria Alves Oliveira, Cecília, additional, da Silva, Lidya Cardozo, additional, Gontijo Vaz, Boniek, additional, and Terra Martins, Felipe, additional

Published
2020
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236. Electrochemical, mechanistic, and DFT studies of amine derived diphosphines containing Ru(ii)–cymene complexes with potent in vitro cytotoxic activity against HeLa and triple-negative breast cancer cells MDA-MB-231

Author

da Silva, Juliana P., primary, Fuganti, Otávio, additional, Kramer, M. Gabriela, additional, Facchin, Gianella, additional, Aquino, Lucas E. N., additional, Ellena, Javier, additional, Back, Davi F., additional, Gondim, Ana C. S., additional, Sousa, Eduardo H. S., additional, Lopes, Luiz G. F., additional, Machado, Silvane, additional, Guimarães, Ivelise D. L., additional, Wohnrath, Karen, additional, and de Araujo, Márcio P., additional

Published
2020
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243. Facile Synthesis and Characterization of Symmetric N-[(Phenylcarbonyl) carbamothioyl]benzamide Thiourea: Experimental and Theoretical Investigations

Author

Silveira, Rafael G., Catão, Anderson J. L., Cunha, Beatriz N., Almeida, Fernando, Correa, Rodrigo S., Diniz, Luan F., Tenório, Juan C., Ellena, Javier, Kuznetsov, Aleksey E., Batista, Alzir A., and Alcântara, Edésio

Subjects
synthesis, intramolecular hydrogen bond, thioureas derivative
Abstract

A thiourea derivative, N-[(phenylcarbonyl)carbamothioyl]benzamide, was synthesized and characterized by elemental analysis, thermal analysis, spectroscopic methods (Fourier transform infrared (FTIR), UV-Vis, Raman, matrix-assisted laser desorption-ionization time-of-flight mass spectrometry (MALDI-TOF), tandem mass spectrometry (MS/MS) and nuclear magnetic resonance (NMR)) and quantum-chemical calculations. The synthetic route was simple and efficient, conducted just by one-step and no purification step was needed. The compound crystallizes in a non-centrosymmetric orthorhombic crystal system with a P21 21 21 space group, with a= 5.06220(10) Å, b= 11.8623(3) Å, c= 21.9682(8) Å. The molecular conformation of the solid is stabilized by the N-H···O intramolecular hydrogen bond, which was present in the X-ray structure and was also found in the optimized geometry. The theoretical analysis showed that this strong interaction remains even when molecules are solvated, i.e., the rotation barrier and the hydrogen bond strength are greater than the solvent stabilization energy. In addition to this hydrogen bond effect, the relative position of phenyl groups has a certain influence on the chemical behavior of this thiourea and probably for other phenylthioureas.

Published
2018

246. Picraviane A and B: Nortriterpenes with limonoid-like skeletons containing a heptanolide E-ring system from Picramnia glazioviana

Author

Gimenes, Leila, Batista Junior, Joao Marcos, dos Santos Junior, Fernando Martins, Souza, Matheus da Silva, Luna-Dulcey, Liany, Ellena, Javier, Cominetti, Marcia Regina, da Silva, Maria Fatima das Graças Fernandes, Vieira, Paulo Cezar, Fernandes, Joao Bastita, Stærk, Dan, Gimenes, Leila, Batista Junior, Joao Marcos, dos Santos Junior, Fernando Martins, Souza, Matheus da Silva, Luna-Dulcey, Liany, Ellena, Javier, Cominetti, Marcia Regina, da Silva, Maria Fatima das Graças Fernandes, Vieira, Paulo Cezar, Fernandes, Joao Bastita, and Stærk, Dan

Abstract

Two highly oxygenated nortriterpenes, picraviane A and B, were isolated from the ethanolic extract of Picramnia glazioviana Engl. The structures were determined by analysis of HRMS and 2D NMR spectroscopic data. Single-crystal X-ray diffraction data was also obtained for picraviane B. The absolute configuration of both compounds were assigned by comparison of experimental and calculated vibrational and electronic circular dichroism spectroscopy, respectively. Picraviane A showed a moderate cytotoxic activity against the triple negative MDA-MB-231 breast cancer cell line. These compounds represent an undescribed class of natural products with limonoid-like skeletons containing a heptanolide as the E-ring.

Published
2019

250. Estudio estructural y supramolecular del ácido 2-E-((4-hidroxifenil) diazenil) benzoico.

Author

García-Carreño, Camila A., Cardona-Restrepo, Camila, Castro-Giraldo, Elizabeth, Rojas Alvarez, Oscar E., Ellena, Javier, and D'Vries, Richard F.

Subjects
CRYSTAL structure, UNIT cell, MOLECULES, INTERMOLECULAR interactions, SPACE groups
Abstract

Copyright of Revista Colombiana de Química is the property of Universidad Nacional de Colombia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2021
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