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De Jesus JC, Noguchi HK, Toledo MFZJ, Burrow RA, Pimenta DC, Stefani HA. Synthesis of Glycal Amides from Amino Acid Esters by Carbonylative Coupling Reaction. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Jessica C. De Jesus
- Departamento de Farmácia Faculdade de Ciências Farmacêuticas Universidade de São Paulo Av. Prof. Lineu Prestes, 580 05580-000 São Paulo – SP Brasil
| | - Henrique K. Noguchi
- Departamento de Farmácia Faculdade de Ciências Farmacêuticas Universidade de São Paulo Av. Prof. Lineu Prestes, 580 05580-000 São Paulo – SP Brasil
| | - Mônica F. Z. J. Toledo
- Departamento de Farmácia Faculdade de Ciências Farmacêuticas Universidade de São Paulo Av. Prof. Lineu Prestes, 580 05580-000 São Paulo – SP Brasil
| | - Robert A. Burrow
- Departamento de Química Universidade Federal de Santa Maria Santa Maria – RS 97105-340 Brazil
| | | | - Hélio A. Stefani
- Departamento de Farmácia Faculdade de Ciências Farmacêuticas Universidade de São Paulo Av. Prof. Lineu Prestes, 580 05580-000 São Paulo – SP Brasil
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Dahmer J, Marangon P, Adolpho LO, Reis FL, Maldaner G, Burrow RA, Mostardeiro MA, Dalcol II, Morel AF. Alkaloids from the stem barks of Scutia buxifolia Reissek (Rhamnaceae): Structures and antimicrobial evaluation. Phytochemistry 2022; 196:113071. [PMID: 35032919 DOI: 10.1016/j.phytochem.2021.113071] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Revised: 11/29/2021] [Accepted: 12/21/2021] [Indexed: 06/14/2023]
Abstract
A reinvestigation of the chemical constituents of the stem barks of Scutia buxifolia, a member of the Rhamnaceae, resulted, along with the known alkaloids scutianine C and scutianene L, in the isolation of three undescribed diastereoisomeric alkaloids - scutianine N, 27-epi-scutianine N and 3, 4, 7-tri-epi-scutianine N -, one undescribed non macrocyclic alkaloid - scutianine Q - and a neutral compound -scutianene M. Their structures were determined using extensive NMR techniques and HRMS. The absolute configurations of the stereogenic centers of the three diastereoisomeric alkaloids have been assigned by gas chromatography employing modified cyclodextrins as chiral stationary phases. Scutianine Q had its structure and stereochemistry defined by single crystal X-ray crystallographic analysis. All tested compounds showed good to moderate antibacterial activity (MICs between 1.56 and 100 μg mL-1) when evaluated in vitro against a panel of Gram-positive and Gram-negative bacteria. Some stereochemistry-activity relationships have been identified for the antibacterial activity of diastereoisomeric alkaloids against the Gram-negative bacteria Enterobacter aerogenes. The alkaloid 27-epi-scutianine N was as active as the standard antibiotic chloramphenicol (MIC = 1.56 μg mL-1), while scutianine N and 3,4,27-tris-epi-Scutianine N were inactive (>100 μg mL-1).
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Affiliation(s)
- Janice Dahmer
- Universidade Federal de Santa Maria, Departamento de Química, CEP, 97105-900, Santa Maria, RS, Brazil
| | - Patricia Marangon
- Universidade Federal de Santa Maria, Departamento de Química, CEP, 97105-900, Santa Maria, RS, Brazil
| | - Luciana O Adolpho
- Programa de Pós-Graduação em Farmacologia, Universidade Federal de Santa Maria (UFSM), Santa Maria, RS 97105-900, Brazil
| | - Frederico L Reis
- Universidade Federal de Santa Maria, Departamento de Química, CEP, 97105-900, Santa Maria, RS, Brazil
| | - Graciela Maldaner
- Universidade Federal de Santa Maria, Departamento de Química, CEP, 97105-900, Santa Maria, RS, Brazil
| | - Robert A Burrow
- Universidade Federal de Santa Maria, Departamento de Química, CEP, 97105-900, Santa Maria, RS, Brazil
| | - Marco A Mostardeiro
- Universidade Federal de Santa Maria, Departamento de Química, CEP, 97105-900, Santa Maria, RS, Brazil
| | - Ionara I Dalcol
- Universidade Federal de Santa Maria, Departamento de Química, CEP, 97105-900, Santa Maria, RS, Brazil; Programa de Pós-Graduação em Farmacologia, Universidade Federal de Santa Maria (UFSM), Santa Maria, RS 97105-900, Brazil.
| | - Ademir F Morel
- Universidade Federal de Santa Maria, Departamento de Química, CEP, 97105-900, Santa Maria, RS, Brazil.
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Gehm AZ, Cunha SB, Willis B, Mostardeiro MA, Bastos N, Burrow RA, Caro MS, Dalcol II, Morel AF. New cyclopeptide alkaloid of Condalia buxiolia and the absolute stereochemistry of Condaline A. Fitoterapia 2022; 159:105194. [DOI: 10.1016/j.fitote.2022.105194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Revised: 04/07/2022] [Accepted: 04/09/2022] [Indexed: 11/27/2022]
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Darbem MP, Esteves HA, Burrow RA, Soares-Paulino AA, Pimenta DC, Stefani HA. Synthesis of unprotected glyco-alkynones via molybdenum-catalyzed carbonylative Sonogashira cross-coupling reaction. RSC Adv 2022; 12:2145-2149. [PMID: 35425248 PMCID: PMC8979075 DOI: 10.1039/d1ra08388k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Accepted: 12/10/2021] [Indexed: 12/03/2022] Open
Abstract
Herein we report a novel Mo-catalyzed carbonylative Sonogashira cross-coupling between 2-iodoglycals and terminal alkynes. The reaction displays major improvements compared to a related Pd-catalyzed procedure previously published by our group, such as utilizing unprotected sugar derivatives as starting materials and tolerance to substrates bearing chelating groups. In this work we also demonstrate the utility of the glyco-alkynone products as platform for further functionalization by synthesizing glyco-flavones via Au-catalyzed 6-endo-dig cyclization. Thermal ellipsoid representation of compound 3a.![]()
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Affiliation(s)
- Mariana P Darbem
- Departamento de Farmácia, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo Avenida Prof. Lineu Prestes, 580 - Bl. 13 São Paulo 05508-000 Brazil
| | - Henrique A Esteves
- Yusuf Hamied Department of Chemistry, University of Cambridge Cambridge CB2 1EW UK
| | - Robert A Burrow
- Departamento de Química, Universidade Federal de Santa Maria Santa Maria 97105-340 Brazil
| | - Antônio A Soares-Paulino
- Departamento de Farmácia, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo Avenida Prof. Lineu Prestes, 580 - Bl. 13 São Paulo 05508-000 Brazil
| | | | - Hélio A Stefani
- Departamento de Farmácia, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo Avenida Prof. Lineu Prestes, 580 - Bl. 13 São Paulo 05508-000 Brazil
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da Silva FD, Cabral BN, Hennemann AL, Pineda NR, Burrow RA, Piquini PC, Lang ES, dos Santos SS. Synthesis and structural characterization of two exotic examples of aryltellurolate cluster compounds: [Ag4Hg(µ-Te Py-κTe)3(µ3-Te Py-κTe)2(µ3-Te Py-κN,Te)(PPh3)2] and [{Cu(phen)}3(µ3-TePh)3(CuCl)]⋅0.5C2H6O. INORG CHEM COMMUN 2021. [DOI: 10.1016/j.inoche.2021.109024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Amaral LDO, Lima VS, Soares SM, Bornhorst J, Lemos SS, Gatto CC, Burrow RA, Gubert P. Synthesis, structural characterization and evaluation of the chelating potential in C. elegans involving complexes of mercury (II) with Schiff bases derived from amino acids. J Organomet Chem 2020. [DOI: 10.1016/j.jorganchem.2020.121500] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Wust KM, Beck TS, Burrow RA, Oliveira SM, Brum ES, Brusco I, Machado G, Bianchi O, Villetti MA, Frizzo CP. Physicochemical characterization, released profile, and antinociceptive activity of diphenhydraminium ibuprofenate supported on mesoporous silica. Mater Sci Eng C Mater Biol Appl 2020; 108:110194. [PMID: 31923931 DOI: 10.1016/j.msec.2019.110194] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Revised: 09/02/2019] [Accepted: 09/11/2019] [Indexed: 11/30/2022]
Abstract
The thermal, physical, and morphological properties of diphenhydraminium ibuprofenate ([DIP][IBU]) adsorbed onto mesoporous silica (SiO2-60 Å and SiO2-90 Å) from solution were determined. The thermal, physical, and morphological properties of [DIP][IBU] supported on silica were determined. The adsorption of [DIP][IBU] on the pores and surface of silica was proven by N2 adsorption/desorption isotherms. Additionally, release profiles were determined for all systems, and the antinociceptive activity of neat [DIP][IBU] and [DIP][IBU] supported on silica were determined. The interaction of [DIP][IBU] and silica was dependent on pore size, with the formation of a [DIP][IBU] monolayer on SiO2-60 and a multilayer on SiO2-90. The release profile was sustained and slow and dependent on the pore size of the silica, in which the smaller the pore size, the faster the release. The nociceptive evaluation showed that [DIP][IBU] presents a greater (99.21 ± 0.85%) antinociceptive effect than the ibuprofen (46 ± 4.3%). Additionally, [DIP][IBU] on SiO2-60 (90 ± 5.8%) had a greater antinociceptive effect than on SiO2-90 (73 ± 13.2%), which indicates that in vivo tests are in accordance with the in vitro experiments.
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Affiliation(s)
- Keli M Wust
- NUQUIMHE, Federal University of Santa Maria (Universidade Federal de Santa Maria - UFSM), Santa Maria, RS, Brazil
| | - Thaíssa S Beck
- NUQUIMHE, Federal University of Santa Maria (Universidade Federal de Santa Maria - UFSM), Santa Maria, RS, Brazil
| | - Robert A Burrow
- Department of Chemistry, Federal University of Santa Maria (Universidade Federal de Santa Maria - UFSM), Santa Maria, Brazil
| | - Sara M Oliveira
- Graduate Program in Biological Sciences: Toxicological Biochemical, Center of Natural and Exact Sciences, UFSM, Santa Maria, RS, Brazil
| | - Evelyne S Brum
- Graduate Program in Biological Sciences: Toxicological Biochemical, Center of Natural and Exact Sciences, UFSM, Santa Maria, RS, Brazil
| | - Indiara Brusco
- Graduate Program in Biological Sciences: Toxicological Biochemical, Center of Natural and Exact Sciences, UFSM, Santa Maria, RS, Brazil
| | - Giovanna Machado
- Center for Strategic Technologies of the Northeast (Centro de Tecnologias Estratégicas do Nordeste - CETENE), Electronic Microscopy and Nanotechnology, Recife, PE, Brazil
| | - Otavio Bianchi
- Materials Science Graduate Program, Caxias do Sul University (Universidade de Caxias do Sul - UCS), Caxias do Sul, RS, Brazil
| | - Marcos A Villetti
- Lepol, Department of Physics, Federal University of Santa Maria (Universidade Federal de Santa Maria - UFSM), Santa Maria, Brazil
| | - Clarissa P Frizzo
- NUQUIMHE, Federal University of Santa Maria (Universidade Federal de Santa Maria - UFSM), Santa Maria, RS, Brazil.
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Arizaga L, Cañon-Mancisidor W, Gancheff JS, Burrow RA, Armentano D, Lloret F, González R, Kremer C, Chiozzone R. New hexanuclear FeIII clusters with the gem-diol hydrated form of di(2-pyridyl)ketone and carboxylato ligands: Crystal structures and magnetic properties. Polyhedron 2019. [DOI: 10.1016/j.poly.2019.114165] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Burrow RA, Duarte R. Hydrogen bond nets in dithionate metal salt crystals. Acta Crystallogr A Found Adv 2019. [DOI: 10.1107/s0108767319096764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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Burrow RA, Duarte R. Solid-state structural transformation of two-dimensional coordination polymers. Acta Crystallogr A Found Adv 2018. [DOI: 10.1107/s0108767318097386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Bizzi CA, Cruz SM, Schmidt L, Burrow RA, Barin JS, Paniz JNG, Flores EMM. Maxwell–Wagner Effect Applied to Microwave-Induced Self-Ignition: A Novel Approach for Carbon-Based Materials. Anal Chem 2018; 90:4363-4369. [DOI: 10.1021/acs.analchem.7b03731] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Cezar A. Bizzi
- Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, Rio Grande do Sul, Brazil
| | - Sandra M. Cruz
- Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, Rio Grande do Sul, Brazil
| | - Lucas Schmidt
- Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, Rio Grande do Sul, Brazil
| | - Robert A. Burrow
- Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, Rio Grande do Sul, Brazil
| | - Juliano S. Barin
- Departamento de Tecnologia e Ciência dos Alimentos, Universidade Federal de Santa Maria, 97105-900 Santa Maria, Rio Grande do Sul, Brazil
| | - Jose N. G. Paniz
- Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, Rio Grande do Sul, Brazil
| | - Erico M. M. Flores
- Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, Rio Grande do Sul, Brazil
- Instituto Nacional de Ciência e Tecnologia de Bioanalítica-INCTBio, 13083-970 Campinas, São Paulo, Brazil
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Cargnelutti R, Delgado CP, Cervo R, Tirloni B, Burrow RA, Lang ES. Synthesis and structural chemistry of CoII, CuII, CuI and PdII complexes containing a flexible monoselenoether ligand. NEW J CHEM 2018. [DOI: 10.1039/c8nj03621g] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A monoselenoether ligand (PySeCH2Py) reacts with CoII, CuII, CuI and PdII resulting in the formation of molecular, polymeric or cyclometallated complexes depending on the starting material used and the reaction conditions applied.
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Affiliation(s)
- Roberta Cargnelutti
- Department of Chemistry
- Universidade Federal de Santa Maria
- LMI – Laboratório de Materiais Inorgânicos
- Santa Maria
- Brazil
| | - Cássia P. Delgado
- Department of Chemistry
- Universidade Federal de Santa Maria
- LMI – Laboratório de Materiais Inorgânicos
- Santa Maria
- Brazil
| | - Rodrigo Cervo
- Department of Chemistry
- Universidade Federal de Santa Maria
- LMI – Laboratório de Materiais Inorgânicos
- Santa Maria
- Brazil
| | - Bárbara Tirloni
- Department of Chemistry
- Universidade Federal de Santa Maria
- LMI – Laboratório de Materiais Inorgânicos
- Santa Maria
- Brazil
| | - Robert A. Burrow
- Department of Chemistry
- Universidade Federal de Santa Maria
- LMI – Laboratório de Materiais Inorgânicos
- Santa Maria
- Brazil
| | - Ernesto S. Lang
- Department of Chemistry
- Universidade Federal de Santa Maria
- LMI – Laboratório de Materiais Inorgânicos
- Santa Maria
- Brazil
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Inoue MH, Back DF, Burrow RA, Nunes FS. Crystal structure of 4-formylpyridine semicarbazone hemihydrate. Acta Crystallogr E Crystallogr Commun 2015; 71:o317-8. [PMID: 25995925 PMCID: PMC4420042 DOI: 10.1107/s2056989015007276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Accepted: 04/11/2015] [Indexed: 12/03/2022]
Abstract
The molecule of the title compound C7H8N4O·0.5H2O, alternatively called (E)-1-(pyridin-4-ylmethylene)semicarbazide hemihydrate, is in the E conformation and is almost planar; the r.m.s. deviation of the positions of the atoms of the pyridine ring from the best-fit plane is 0.0039 Å. The C, N and O atoms of the rest of the molecule sits close on this plane with a largest deviation of 0.115 (4) Å for the O atom of the semicarbazone moiety. There is an intramolecular N—H⋯N hydrogen bond. In the crystal, molecules are linked into an infinite three-dimensional network by classical N—H⋯Os (s = semicarbazone) and Ow—H⋯N (w = water) hydrogen bonds.
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Tavares LC, Fernandes TS, Ilha V, Tiburski Neto A, Santos EWD, Burrow RA, Duarte FA, Flores EMM, Silva UF, Mostardeiro MA, Morel AF. Limonin Derivatives: Synthesis Using Methodology in Solution and Heterogeneous Medium and Evaluation of the Antimicrobial Activity. J BRAZIL CHEM SOC 2015. [DOI: 10.5935/0103-5053.20150266] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Strapasson LB, Rúdiger AL, Burrow RA, Barison A, Stefanello MEA. A new sesquiterpene lactone and other constituents of Moquiniastrum polymorphum subsp. floccosum (Asteraceae). Nat Prod Commun 2014; 9:1541-1543. [PMID: 25532275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023] Open
Abstract
A new guaianolide, 1S, 3S, 5R, 6S, 7S, 11R-l-hydroxy-11α,13-dihydrozaluzanin C (1), was isolated from Moquiniastrum polymorphum subsp. floccosum trunk bark, together with fifteen known compounds, which were identified as 11α,13-dihydroglucozaluzanin C (2), 8α-hydroxy-11α,13-dihydrozaluzanin C (3), zaluzanin C (4), gochnatiolide B (5), ethyl caffeate (6), methyl chlorogenate (7), ethyl chlorogenate (8), methyl 3,5-dicaffeoyl quinate (9), ethyl 3,5-dicaffeoyl quinate (10), methyl 4,5-dicaffeoyl quinate (11), ethyl 4,5-dicaffeoyl quinate (12), ethyl 3,4-dicaffeoyl quinate (13), 3,5-dicaffeoyl quinic acid (14), 4,5-dicaffeoyl quinic acid (15), and 3,4-dicaffeoyl quinic acid (16). With the exception of 5, all known compounds are being reported for the first time in M. polymorphum.
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Strapasson RLB, Rüdiger AL, Burrow RA, Barison A, Stefanello MΈA. A New Sesquiterpene Lactone and Other Constituents of Moquiniastrum polymorphum subsp. floccosum (Asteraceae). Nat Prod Commun 2014. [DOI: 10.1177/1934578x1400901102] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
A new guaianolide, 1 S, 3 S, 5 R, 6 S, 7 S, 11 R-1-hydroxy-11α,13-dihydrozaluzanin C (1), was isolated from Moquiniastrum polymorphum subsp. floccosum trunk bark, together with fifteen known compounds, which were identified as 11α,13-dihydroglucozaluzanin C (2), 8α-hydroxy-11α,13-dihydrozaluzanin C (3), zaluzanin C (4), gochnatiolide B (5), ethyl caffeate (6), methyl chlorogenate (7), ethyl chlorogenate (8), methyl 3,5-dicaffeoyl quinate (9), ethyl 3,5-dicaffeoyl quinate (10), methyl 4,5-dicaffeoyl quinate (11), ethyl 4,5-dicaffeoyl quinate (12), ethyl 3,4-dicaffeoyl quinate (13), 3,5-dicaffeoyl quinic acid (14), 4,5-dicaffeoyl quinic acid (15), and 3,4-dicaffeoyl quinic acid (16). With the exception of 5, all known compounds are being reported for the first time in M. polymorphum.
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Affiliation(s)
| | - André Luis Rüdiger
- Department of Chemistry, Federal University of Paraná, Curitiba, PR, 81530-900, Brazil
| | - Robert A. Burrow
- Department of Chemistry, Federal University of Santa Maria, Santa Maria, RS, 97105-900, Brazil
| | - Andersson Barison
- Department of Chemistry, Federal University of Paraná, Curitiba, PR, 81530-900, Brazil
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Martínez L, Gancheff JS, Hahn FE, Burrow RA, González R, Kremer C, Chiozzone R. Nickel(II) complexes with methyl(2-pyridyl)ketone oxime: synthesis, crystal structures and DFT calculations. Spectrochim Acta A Mol Biomol Spectrosc 2013; 105:439-445. [PMID: 23337748 DOI: 10.1016/j.saa.2012.12.042] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2012] [Revised: 12/11/2012] [Accepted: 12/14/2012] [Indexed: 06/01/2023]
Abstract
The synthesis and structural characterization of the three novel nickel(II) complexes [Ni(OOCPh)(2)(mpkoH)(2)] (1), [Ni(NO(3))(2)(mpkoH)(2)] (2) and [Ni(mpkoH)(3)](NO(3))(2)·½H(2)O (3·½H(2)O), with mpkoH=methyl(2-pyridyl)ketone oxime is reported. Geometry optimization and population analyses were performed by means of DFT calculations for the previously mentioned compounds as well as for [NiCl(2)(mpkoH)(2)] (4). Electronic UV-vis spectra were also simulated in the TD-DFT framework to assign the origin of the absorption bands and in doing so, to have a clear picture of the absorptive features of the coordination compounds under investigation.
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Affiliation(s)
- Lorena Martínez
- Cátedra de Química Inorgánica, Departamento Estrella Campos, Facultad de Química, Universidad de la República, Avda. General Flores 2124, CC 1157 Montevideo, Uruguay
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Burrow RA, Siqueira da Silva RM. (9 H-Fluoren-9-yl)(phenyl)phosphinic acid. Acta Crystallogr Sect E Struct Rep Online 2013; 69:o1. [PMID: 23476362 PMCID: PMC3588309 DOI: 10.1107/s160053681204891x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2012] [Accepted: 11/28/2012] [Indexed: 12/01/2022]
Abstract
The crystal structure of the title compound, C19H15O2P, features pairs of molecules joined by O—H⋯O hydrogen bonds across crystallographic inversion centers. In addition, π–π interactions, with a centroid–centroid distance of 3.6273 (9) Å between the fluorene ring systems, connect the dimers into chains along [01-1]. The three rings make dihedral angles of 1.34 (9), 1.52 (10) and 1.51 (7)° with each other.
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Burrow RA, Vicenti JRDM. Redetermination of cis-bis(ethylenediamine-κ 2N, N′)bis(nitrito-κ N)cobalt(III) (ethylenediamine-κ 2N, N′)tetrakis(nitrito-κ N)cobaltate(III) monohydrate. Acta Crystallogr Sect E Struct Rep Online 2013; 69:m56-7. [PMID: 23476350 PMCID: PMC3588370 DOI: 10.1107/s1600536812050325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2012] [Accepted: 12/10/2012] [Indexed: 11/25/2022]
Abstract
The structure of the title compound, [Co(NO2)2(NH2CH2CH2NH2)2][Co(NO2)4(NH2CH2CH2NH2)]·H2O, was redetermined with a modern CCD-equipped diffractometer. In comparison with the original determination based on photographic data [Kushi et al. (1976 ▶). Inorg. Nucl. Chem. Lett. 12, 629–633], the current study allows the location of reliable postions for the H atoms and thus leads to better understanding of the interionic and intermolecular interactions. The crystal structure consists of an octahedrally coordinated cationic CoIII complex ion, an octahedrally coordinated anionic CoIII complex ion and a lattice water molecule. The complex cation, complex anion and lattice water molecule are connected by an intricate network of O—H⋯O and N—H⋯O hydrogen bonds, forming a three-dimensional structure.
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Abstract
The crystal structure of the title compound, C8H11O2P, features O-H⋯O hydrogen bonds, which link mol-ecules related by the b-glide plane into chains along [010].
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Affiliation(s)
- Robert A Burrow
- Laboratório de Materiais Inorgânicos, Universidade Federal de Santa Maria, 97105-900 Santa Maria-RS, Brazil
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22
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Stieler R, Back DF, Tirloni B, Burrow RA, Lang ES. Synthesis and X-ray Structural Characterization of the Polymeric Cluster Compound [Hg3(O2SePh)(SePh)5]n. Z Anorg Allg Chem 2012. [DOI: 10.1002/zaac.201200257] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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23
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Abstract
The absolute configuration of franganine (1), a cyclopeptide alkaloid isolated from the methanol root bark extract of Discaria americana, was established on the basis of detailed NMR spectroscopic data and X-ray diffraction analysis of its salt (2).
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Affiliation(s)
- Miguel S B Caro
- Departamento de Química, Universidade Federal de Santa Catarina, CEP 88040-970, Florianópolis, SC, Brazil
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24
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Dennehy M, Quinzani OV, Ferullo RM, Granados A, Burrow RA. Aurophilic interaction in gold(I) thiosaccharinates: Synthesis, characterization, crystal structures and DFT theoretical study. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2011.07.052] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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26
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27
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Abstract
The crystal structure of the title compound, C7H9O2P, displays O—H⋯O hydrogen bonding , which links individual molecules related via the c-glide plane and translational symmetry along the crystallographic b-axis direction into continuous chains.
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Affiliation(s)
- Robert A Burrow
- Laboratório de Materiais Inorgânicos, Universidade Federal de Santa Maria, Av. Roraima, 1000 - Camobi, 97105-900 Santa Maria, RS, Brazil
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28
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Maldaner G, Marangon P, Ilha V, Caro MSB, Burrow RA, Dalcol II, Morel AF. Cyclopeptide alkaloids from Scutia buxifolia Reiss. Phytochemistry 2011; 72:804-809. [PMID: 21420695 DOI: 10.1016/j.phytochem.2011.02.019] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2010] [Revised: 02/12/2011] [Accepted: 02/21/2011] [Indexed: 05/30/2023]
Abstract
Scutianene E (1), 3,4,28-tris-epi-scutiaene E (2), 28-epi-scutianene E (3) and scutianene L (4), four neutral cyclopeptide alkaloids, were isolated from Scutia buxifolia Reiss, together with four known cyclopeptide alkaloids, scutianines B, C, D and E. Scutianenes 1-3 are diastereoisomeric compounds, with 3-hydroxyleucine as a β-hydroxy amino acid unit, which is connected to the styryl fragment via an ether bridge, β-phenylserine, as a common ring-bonded amino acid residue. Attached to the amino group of β-hydroxyamino acid is a side chain [trans-CH=CH-Ph]. The structures of the peptides were elucidated by means of spectroscopic analysis, including extensive 2D NMR studies. The stereochemistry for the diastereomeric 3,4,28-tris-epi-scutiaene E and 28-epi-scutianene E was confirmed by X-ray diffraction analysis of their O-acetyl derivatives.
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Affiliation(s)
- Graciela Maldaner
- Departamento de Química (NPPN), Universidade Federal de Santa Maria, Santa Maria, RS, Brazil
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29
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Abstract
The title compound, C13H13O2P, crystallized as enantiomerically pure crystals; for the crystal measured, the P atom has R stereochemistry. The crystal structure displays O—H⋯O hydrogen bonding, which links individual molecules related by a 21 screw axis parallel to the crystallographic a-axis direction into continuous chains.
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30
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Monteiro JHSK, Adati RD, Davolos MR, Vicenti JRM, Burrow RA. Correlation between structural data and spectroscopic studies of a new β-diketonate complex with trivalent europium and gadolinium. NEW J CHEM 2011. [DOI: 10.1039/c0nj00831a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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31
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Tirloni B, Back DF, Burrow RA, Oliveira GNMD, Villetti MA, Lang ES. Synthesis and crystal structure of chalcogenide cluster compound. J BRAZIL CHEM SOC 2010. [DOI: 10.1590/s0103-50532010000700010] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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32
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Stieler R, Bublitz F, Burrow RA, Oliveira GNMD, Villetti MA, Pereira MB, Piquini P, Lang ES. Synthesis and characterization of [Cd8Cl2Se(SePh)12(PCy3)2]·2.5CH3OH. J BRAZIL CHEM SOC 2010. [DOI: 10.1590/s0103-50532010001100017] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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33
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Lang ES, Burrow RA, Stieler R, Villetti MA. Cadmium bis(phenylselenolate) as a precursor for the synthesis of polymeric Cd(μ-Se)clusters: Crystal and molecular structures of [Cd4(SePh)7(PPh3)X]n (X=Cl, Br). J Organomet Chem 2009. [DOI: 10.1016/j.jorganchem.2009.04.027] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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34
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Falcomer VA, Lemos SS, Politi JR, Casagrande GA, Lang ES, Burrow RA. Synthesis, structure and properties of the mixed-ligand tungsten(II) complex [WBr2(CO)3(tmpymt)] (tmpymt = 1,4,6-trimethylpyrimidine-2-thione). INORG CHEM COMMUN 2009. [DOI: 10.1016/j.inoche.2009.04.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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35
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Peppe C, de Andrade FM, Vargas JP, Mello MDA, Barcellos RA, Burrow RA, da Silva RMS. Dihalogen–halogenomethyl complexes of indium(III) X2InCH2X (X=Br, I): Simultaneous coordination of soft and hard ligands. J Organomet Chem 2009. [DOI: 10.1016/j.jorganchem.2009.03.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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36
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Marin G, Braga AL, Rosa AS, Galetto FZ, Burrow RA, Gallardo H, Paixão MW. Efficient synthesis of selenol esters from acid chlorides mediated by indium metal. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.03.069] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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37
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Zanatta N, Madruga CC, Marisco PC, Da Rosa LS, Fernandes LDS, Flores DC, Flores AFC, Burrow RA, Bonacorso HG, Martins MAP. Synthesis and structural study of a new series of 2‐methylsulfanyl‐tetrahydropyrimidines from β‐alkoxyvinyl trihalomethyl ketones. J Heterocycl Chem 2009. [DOI: 10.1002/jhet.5570450127] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Nilo Zanatta
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria, 97.105–900, Santa Maria, RS, Brazil
| | - Claudia C. Madruga
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria, 97.105–900, Santa Maria, RS, Brazil
| | - Patricia C. Marisco
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria, 97.105–900, Santa Maria, RS, Brazil
| | - Luciana S. Da Rosa
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria, 97.105–900, Santa Maria, RS, Brazil
| | - Liana Da S. Fernandes
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria, 97.105–900, Santa Maria, RS, Brazil
| | - Darlene C. Flores
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria, 97.105–900, Santa Maria, RS, Brazil
| | - Alex F. C. Flores
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria, 97.105–900, Santa Maria, RS, Brazil
| | - Robert A. Burrow
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria, 97.105–900, Santa Maria, RS, Brazil
| | - Helio G. Bonacorso
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria, 97.105–900, Santa Maria, RS, Brazil
| | - Marcos A P. Martins
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria, 97.105–900, Santa Maria, RS, Brazil
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38
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Manzoni de Oliveira G, Bortolotto R, Ribas DG, Faoro E, Schulz Lang E, Burrow RA. Chelation of CeIIIand PrIIIbyN,N′-Bis(pyridoxylideneiminato)ethylene, a Schiff Base Ligand Derived from Vitamin B6: Synthesis, Structural Features and TGA Evaluations of [M(Hpyr2en)(pyr2en)]·nH2O (M = CeIII,n= 2; PrIII,n= 8). Z Anorg Allg Chem 2009. [DOI: 10.1002/zaac.200801338] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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39
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Sauzem PD, Machado P, Rubin MA, da S Sant'anna G, Faber HB, de Souza AH, Mello CF, Beck P, Burrow RA, Bonacorso HG, Zanatta N, Martins MAP. Design and microwave-assisted synthesis of 5-trifluoromethyl-4,5-dihydro-1H-pyrazoles: Novel agents with analgesic and anti-inflammatory properties. Eur J Med Chem 2008; 43:1237-47. [PMID: 17889969 DOI: 10.1016/j.ejmech.2007.07.018] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2007] [Revised: 07/12/2007] [Accepted: 07/20/2007] [Indexed: 10/22/2022]
Abstract
In this work, we reported the synthesis and evaluation of the analgesic and anti-inflammatory properties of novel 3- or 4-substituted 5-trifluoromethyl-5-hydroxy-4,5-dihydro-1H-1-carboxyamidepyrazoles (where 3-/4-substituent=H/H, Me/H, Et/H, Pr/H, i-Pr/H, Bu/H, t-Bu/H, Ph/H, 4-Br-Ph/H and H/Me) designed in the exploration of the bioisosteric replacement of benzene present in salicylamide with a 5-trifluoromethyl-4,5-dihydro-1H-pyrazole scaffold. Target compounds were synthesized from the cyclocondensation of 4-alkoxy-1,1,1-trifluoromethyl-3-alken-2-ones with semicarbazide hydrochloride through a rapid one-pot reaction via microwave irradiation. In addition to spectroscopic data, the structure of the compounds was supported by X-ray diffraction. Subcutaneous administration of the 5-trifluoromethyl-4,5-dihydro-1H-pyrazoles decreased pain-related behavior during neurogenic and inflammatory phases of the formalin test in mice. Moreover, the more active analgesic compounds (3-/4-=Et/H and H/Me) significantly decreased carrageenan-induced paw edema in mice. The data obtained in this work suggest that the synthesized compounds could be promising candidates for the future development of novel analgesic and anti-inflammatory agents.
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Affiliation(s)
- Patricia D Sauzem
- Laboratório de Neurotoxicidade e Psicofarmacologia, Departamento de Química, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, 97105-900, Santa Maria, RS, Brazil
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40
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Machado A, Manzoni de Oliveira GN, Fenner H, Burrow RA. A centrosymmetric polymorph of chloridotris(triphenylphosphine-κP)copper(I) at 150 K. Acta Crystallogr C 2008; 64:m233-6. [DOI: 10.1107/s0108270108011232] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2008] [Accepted: 04/20/2008] [Indexed: 11/10/2022] Open
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41
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Gressler V, Stüker CZ, Dias GDOC, Dalcol II, Burrow RA, Schmidt J, Wessjohann L, Morel AF. Quinolone alkaloids from Waltheria douradinha. Phytochemistry 2008; 69:994-999. [PMID: 18076957 DOI: 10.1016/j.phytochem.2007.10.018] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2007] [Revised: 09/28/2007] [Accepted: 10/15/2007] [Indexed: 05/25/2023]
Abstract
A phytochemical investigation of the stems of Waltheria douradinha resulted in isolation of two 4-quinolone alkaloids, waltherione B and vanessine, along with three known alkaloids, waltherione A, antidesmone and O-methyltembamide. Their structures were elucidated on the basis of their 2D NMR spectroscopic analyses, and from X-ray crystallographic analysis of waltherione A and the O-methyl derivative of waltherione B. Additionally, waltherione B and vanessine, and the O- and N-methyl derivatives of waltherione A and waltherione B, were evaluated for their antimicrobial activities; only vanessine displayed any (weak) antimicrobial activity.
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Affiliation(s)
- Vanessa Gressler
- Departamento de Química (NPPN), Universidade Federal de Santa Maria, Santa Maria RS, Brazil
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Machado P, A. Rosa F, M. S. da Silva R, A. Burrow R, Martins MAP. 2-(4,5-Dihydro-1,3-oxazol-2-yl)quinoline. Acta Crystallogr Sect E Struct Rep Online 2007; 64:o154. [PMID: 21200719 PMCID: PMC2915222 DOI: 10.1107/s1600536807045023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2007] [Accepted: 09/13/2007] [Indexed: 05/30/2023]
Abstract
The title compound, C(12)H(10)N(2)O, is approximately planar. The angle between the quinoline and 4,5-dihydro-oxazole ring systems is 11.91 (12)°. The mol-ecules pack into a herringbone array with no significant π-π inter-actions. The dihydro-oxazole N and O atoms are disordered over two positions, with almost equal site occupancy factors.
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Affiliation(s)
- Pablo Machado
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria, 97105-900, Santa Maria, RS, Brazil
| | - Fernanda A. Rosa
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria, 97105-900, Santa Maria, RS, Brazil
| | - Rubia M. S. da Silva
- Laboratório de Materiais Inorgânicos, Departamento de Química, Universidade Federal de Santa Maria, 97105-900, Santa Maria, RS, Brazil
| | - Robert A. Burrow
- Laboratório de Materiais Inorgânicos, Departamento de Química, Universidade Federal de Santa Maria, 97105-900, Santa Maria, RS, Brazil
| | - Marcos A. P. Martins
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria, 97105-900, Santa Maria, RS, Brazil
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43
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Dennehy M, Quinzani OV, Burrow RA. Poly[(μ3-1,1-dioxo-1,2-benzoisothiazole-3-thiolato-κ3N:S3:S3)silver(I)]. Acta Crystallogr C 2007; 63:m395-7. [PMID: 17762105 DOI: 10.1107/s0108270107035597] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2007] [Accepted: 07/20/2007] [Indexed: 11/11/2022] Open
Abstract
The centrosymmetric title compound, [Ag(C(7)H(4)NO(2)S(2))]n, consists of dinuclear units in which two thiosaccharinate anions each bridge two Ag atoms via an endocyclic N atom and an exocyclic S atom across a crystallographic centre of inversion midway between the Ag atoms. The dimeric units are connected via Ag-S(exo) interactions to create two-dimensional networks. The thiosaccharinate anions bridge in a mu3-S:S:N manner. The Ag...Ag distance can be considered a strong argentophilic interaction.
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Affiliation(s)
- Mariana Dennehy
- Departamento de Química, Universidad Nacional del Sur, Avenida Alem 1253, B8000CPB Bahia Blanca, Argentina
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Falcomer VA, Lemos SS, Martins GB, Casagrande GA, Burrow RA, Lang ES. Synthesis, structural characterization and reactivity of copper(I)-nitrile complexes: Crystal and molecular structure of [Cu(BzCN)4][BF4]. Polyhedron 2007. [DOI: 10.1016/j.poly.2007.04.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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45
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Consorti CS, Suarez PAZ, de Souza RF, Burrow RA, Farrar DH, Lough AJ, Loh W, da Silva LHM, Dupont J. Identification of 1,3-dialkylimidazolium salt supramolecular aggregates in solution. J Phys Chem B 2007; 109:4341-9. [PMID: 16851500 DOI: 10.1021/jp0452709] [Citation(s) in RCA: 265] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The nature of the interactions between 1,3-dialkylimidazolium cations and noncoordinating anions such as tetrafluoroborate, hexafluorophosphate, and tetraphenylborate has been studied in the solid state by X-ray diffraction analysis and in solution by (1)H NMR spectroscopy, conductivity, and microcalorimetry. In the solid state, these compounds show an extended network of hydrogen-bonded cations and anions in which one cation is surrounded by at least three anions and one anion is surrounded by at least three imidazolium cations. In the pure form, imidazolium salts are better described as polymeric supramolecules of the type {[(DAI)(3)(X)](2+)[(DAI)(X)(3)](2-)}(n) (where DAI is the dialkylimidazolium cation and X is the anion) formed through hydrogen bonds of the imidazolium cation with the anion. In solution, this supramolecular structural organization is maintained to a great extent, at least in solvents of low dielectric constant, indicating that mixtures of imidazolium ionic liquids with other molecules can be considered as nanostructured materials. This model is very useful for the rationalization of the majority of the unusual behavior of the ionic liquids.
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Affiliation(s)
- Crestina S Consorti
- Laboratory of Molecular Catalysis, Institute of Chemistry, UFRGS, Av. Bento Gonçalves, 9500 Porto Alegre 91501-970 RS, Brazil
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Abstract
Investigation of the chemical constituents from the roots of Melochia chamaedrys (Sterculiaceae) resulted in the isolation of two quinolinone alkaloids: a new alkaloid, named chamaedrone (1), and a known alkaloid, antidesmone (2). Their structures and stereochemistry were elucidated on the basis of 2D NMR and X-ray crystallographic analysis. Furthermore, alkaloids 1 and 2, and the synthetic analogues 3-6 obtained from 2, were screened for antimicrobial activities.
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Affiliation(s)
- Gilvan O C Dias
- Departamento de Química, NPPN, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil
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47
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Back DF, de Oliveira GNM, Burrow RA, Castellano EE, Abram U, Lang ES. Mercury Bis(phenyltellurolate) as a Precursor for the Synthesis of Binary and Ternary Nanoclusters. Inorg Chem 2007; 46:2356-8. [PMID: 17326631 DOI: 10.1021/ic070006q] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reaction of Hg(TePh)2 with AgX (X = Cl, NO3) in the presence of PPh3 and PMePh2 in dimethylformamide (DMF) affords the cluster [Hg6Ag4(TePh)16] (1) at room temperature or [Hg6Ag4Te(TePh)14]2 (2) with heating. When Hg(TePh)2 is reacted with [Co(PPh3)2Cl2] or [Ni(PPh3)2Cl2], the clusters [Hg8Te(PhTe)12Cl4]Q [3; Q = [Co(DMF)6]2+ (3a), [Ni(DMF)6]2+ (3b)] are formed. The syntheses of 1 and 2 occur with the incorporation of AgI into the cluster, and the single-crystal analyses show that the two ternary clusters consist of Hg, Ag, and Te centers occupying well-defined positions. Compounds 3a and 3b do not show the incorporation of the metal into the cluster, but the CoII and NiII salts provide the Cl atom to generate the anionic cluster 3 stabilized by the [Co(DMF)6]2+ or [Ni(DMF)6]2+ ion.
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Affiliation(s)
- Davi F Back
- Laboratório de Materiais Inorgânicos, Universidade Federal de Santa Maria, 97119-900 Santa Maria, RS, Brazil
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Menezes Vicenti JRD, Burrow RA. catena-Poly[[(N,N-dimethylformamide-κO)(nitrato-κO)silver(I)]-μ-1,2-bis(diphenylphosphino)ethane-κ2P:P′] at 100 and 293 K: temperature effects on the volume of the solvent pocket. Acta Crystallogr C 2007; 63:m88-90. [PMID: 17339712 DOI: 10.1107/s010827010700306x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2007] [Accepted: 01/19/2007] [Indexed: 11/10/2022] Open
Abstract
In the title chain compound, [Ag(NO(3))(C(3)H(7)NO)(C(26)H(24)P(2))](n), the bis(diphenylphosphino)ethane (dppe) components lie across centres of inversion. The dppe units link the Ag(+) ions into chains along [100]. A nitrate anion is coordinated to the Ag atom, together with one molecule of N,N-dimethylformamide (DMF) solvent. At room temperature, the coordinated DMF shows a long Ag-O distance [2.620 (3) A] and relatively large thermal motion, while at 100 K the Ag-O distance is shorter [2.5588 (19) A] and the thermal motion is similar to that of the rest of the complex. The behaviour of the DMF molecule is related to the size of the solvent pocket, viz. 146 A(3) at 293 K and 131 A(3) at 100 K.
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Affiliation(s)
- Juliano R de Menezes Vicenti
- Laboratório de Materiais Inorgânicos, Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil
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Gatto CC, Lang ES, Burrow RA, Abram U. Syntheses and structures of 2-acetylpyridine-(2-amino-benzoylhydrazone) and its dioxouranium(VI) complex. J BRAZIL CHEM SOC 2006. [DOI: 10.1590/s0103-50532006000800019] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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50
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Santos SSD, Lang ES, Burrow RA. Synthesis and crystal structures of new complex salts containing both cationic and anionic tellurium(IV) species: the role of secondary bonds in the arrangement of tellurium based tectons. J BRAZIL CHEM SOC 2006. [DOI: 10.1590/s0103-50532006000800012] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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