Search results for: Enrique J. Baran

Items from 1 to 20 out of 85 results

article

Metvan, bis(4,7-Dimethyl-1,10-phenanthroline)sulfatooxidovanadium(IV): DFT and Spectroscopic Study—Antitumor Action on Human Bone and Colorectal Cancer Cell Lines

Ignacio E. León, María C. Ruiz, Carlos A. Franca, Beatriz S. Parajón-Costa, more

Biological Trace Element Research > 2019 > 191 > 1 > 81-87

The complex bis(4,7-dimethyl-1,10-phenantroline)sulfatooxidovanadium(IV), commonly known as Metvan, was prepared using a known synthetic procedure. Its optimized molecular structure was obtained by DFT calculations, as it was impossible to grow single crystals adequate for a crystallographic study. The complex was also characterized by a detailed analysis of its infrared spectrum, supported by the...

article

Structural and IR-Spectroscopic Characterization of Aqua Lithium Acesulfamate, an Outlier of the M(ace), M: Na⁺, K⁺, Rb⁺, Cs⁺, Isomorphic Series

Oscar E. Piro, Gustavo A. Echeverría, Beatriz S. Parajón-Costa, Enrique J. Baran

Journal of Chemical Crystallography > 2017 > 47 > 6 > 226-232

The crystal structure of aqua lithium 6-methyl-1,2,3,-oxathiazine-4(3H)-one, 2.2-dioxide, for short Li(ace)H₂O, was determined by X-ray diffraction methods. It crystallizes in the triclinic P $$\overline {1}$$ 1 ¯ space group with a = 6.1750(9) Å, b = 7.3969(9) Å, c = 9.016(1) Å, α = 105.88(1)°, β = 94.59(1)°, γ = 97.80(1)°, and Z = 2 molecules per unit cell. The crystal structure of Li(ace)H...

article

Crystal structure and spectroscopic behavior of synthetic novgorodovaite Ca₂(C₂O₄)Cl₂·2H₂O and its twinned triclinic heptahydrate analog

Oscar E. Piro, Gustavo A. Echeverría, Ana C. González-Baró, Enrique J. Baran

Physics and Chemistry of Minerals > 2018 > 45 > 2 > 185-195

Synthetic novgorodovaite analog Ca₂(C₂O₄)Cl₂·2H₂O is identical to its natural counterpart. It crystallizes in the monoclinic I2/m space group with a = 6.9352(3), b = 7.3800(4), c = 7.4426(3) Å, β = 94.303(4)°, V = 379.85(3) Å³ and Z = 2. The heptahydrate analog, Ca₂(C₂O₄)Cl₂·7H₂O, crystallizes as triclinic twins in the P $$\overline{1}$$ 1¯ space group with a = 7.3928(8), b = 8.9925(4), c = 10.484(2) Å,...

article

Natural iron oxalates and their analogous synthetic counterparts: A review

Enrique J. Baran

Chemie der Erde - Geochemistry > 2016 > 76 > 3 > 449-460

Four iron-containing natural oxalates, usually classified as organic minerals, are known (humboldtine, minguzzite, stepanovite and zhemchuzhnikovite). Their occurrences and general properties are presented and briefly discussed. The subsequent part of the review is devoted to the discussion of synthetic oxalato-complexes, analogous to these natural species, including usual synthetic procedures and...

chapter

Vibrational spectra of oxo-, thio-, and selenometallates of transition elements in the solid state

Achim Müller, Enrique J. Baran, Roscoe O. Carter

Structure and Bonding > Spectra and Chemical Interactions > 81-139

article

Syntheses, Crystal Structures, NMR Spectroscopy, and Vibrational Spectroscopy of Sr(PO₃F)·H₂O and Sr(PO₃F)

Stephan G. Jantz, Leo van Wüllen, Andreas Fischer, Eugen Libowitzky, more

European Journal of Inorganic Chemistry > 2016 > 7 > 1121 - 1128

Single crystals of Sr(PO₃F)·H₂O {P2₁/c, Z = 4, a = 7.4844(2) Å, b = 7.0793(2) Å, c = 8.4265(2) Å, β = 108.696(1)°, V = 422.91(2) Å³, 2391 F_o², 70 parameters, R₁[F² > 2σ(F²)] = 0.036; wR₂(F² all) = 0.049, S = 1.054} were grown from an aqueous solution by a metathesis reaction. The structure comprises [SrO₈] polyhedra and PO₃F tetrahedra that form a layered arrangement parallel to (100). The topotactic...

article

Crystal and molecular structure and spectroscopic behavior of isotypic synthetic analogs of the oxalate minerals stepanovite and zhemchuzhnikovite

Oscar E. Piro, Gustavo A. Echeverría, Ana C. González-Baró, Enrique J. Baran

Physics and Chemistry of Minerals > 2016 > 43 > 4 > 287-300

The crystal structure of synthetic stepanovite, Na[Mg(H₂O)₆][Fe(C₂O₄)₃]·3H₂O, and zhemchuzhnikovite, Na[Mg(H₂O)₆][Al_0.55Fe_0.45(C₂O₄)₃]·3H₂O, has been determined by single-crystal X-ray diffraction methods. The compounds are isotypic to each other and to the previously reported Na[Mg(H₂O)₆][M(C₂O₄)₃]·3H₂O (M: Cr, Al). They crystallize in the trigonal P3c1 space group with Z = 6 molecules per unit cell...

article

Vibrational spectra of the two hydrates of strontium oxalate

Maria C. D’Antonio, María M. Torres, Daniel Palacios, Ana C. González-Baró, more

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy > 2015 > 137 > Complete > 486-489

•IR and Raman spectra of SrC ₂ O ₄ ⋅H ₂ O and SrC ₂ O ₄ ⋅2H ₂ O were recorded and assigned.•Assignments are discussed in comparison with the related calcium oxalates.•SrC ₂ O ₄ ⋅2H ₂ O is isomorphous with CaC ₂ O ₄ ⋅2H ₂ O (weddellite).•SrC ₂ O ₄ ⋅H ₂ O and CaC ₂ O ₄...

article

Synthesis, Crystal Structure, and Properties of Mn(PO₃F)(H₂O)₂

Matthias Weil, Enrique J. Baran, Reinhard K. Kremer, Eugen Libowitzky

Zeitschrift für anorganische und allgemeine Chemie > 641 > 2 > 184 - 191

Single crystals of manganese(II) fluorophosphate dihydrate, Mn(PO₃F)(H₂O)₂, were grown in a metathesis reaction from aqueous solutions of MnCl₂ and (NH₄)₂(PO₃F). The crystal structure [P$\bar{1}$, Z = 2, a = 5.5280(7), b = 5.6357(7), c = 8.2570(10) Å, α = 81.279(2), β = 75.156(2), γ = 71.722(2)°, 1345 structure factors, 86 parameter, R[F² > 2σ(F²)] = 0.0322, wR(F² all) = 0.0771] consists of [MnO...

article

A New Oxidovanadium(IV) Complex of Oxodiacetic Acid and dppz: Spectroscopic and DFT Study. Antitumor Action on MG-63 Human Osteosarcoma Cell Line

Ignacio E. León, Beatriz S. Parajón-Costa, Carlos A. Franca, Susana B. Etcheverry, more

Biological Trace Element Research > 2015 > 164 > 2 > 198-204

The oxidovanadium(IV) complex of oxodiacetic acid (H ₂ ODA) and dppz (dipyrido[3,2-a:2′,3′-c] phenazine) of stoichiometry [VO(ODA)(dppz)]⋅3H ₂ O could be synthesized for the first time by reaction between [VO(ODA)(H ₂ O) ₂ ] and dppz. It was characterized by infrared and electronic spectroscopies. Its optimized molecular structure was obtained...

article

Investigation on the bioactivities of clioquinol and its bismuth(III) and platinum(II,IV) complexes

Karina S.O. Ferraz, Débora C. Reis, Jeferson G. Da Silva, Elaine M. Souza-Fagundes, more

Polyhedron > 2013 > 63 > Complete > 28-35

Complexes [Bi(HCQ) ₂ (H ₂ O)Cl ₃ ] (1), [Pt(CQ) ₂ ]·2KCl (2) and [Pt(CQ) ₂ Cl ₂ ]·KCl (3) were obtained with 5-chloro-7-iodo-8-hydroxyquinoline, “clioquinol”, HCQ. Upon coordination to bismuth(III) the antimicrobial activity improved. Complex (1) was 70-fold more active than fluconazole against Candida albicans. HCQ proved to be cytotoxic to HL-60 and...

article

Vibrational spectra of bis(maltolato)zinc(II), an interesting insulin mimetic agent

Beatriz S. Parajón-Costa, Enrique J. Baran

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy > 2013 > 113 > Complete > 337-339

The FTIR and FT-Raman spectra of the zinc(II) complex of 3-hydroxy-2-methyl-4-pyrone (maltol), bis(maltolato)zinc(II), were recorded and briefly discussed by comparison with the spectra of uncoordinated maltol and with some related maltolato complexes.

article

Bis(oxalato)dioxovanadate(V) and Bis(oxalato)oxoperoxo-vanadate(V) Complexes: Spectroscopic Characterization and Biological Activity

Ignacio E. León, Susana B. Etcheverry, Beatriz S. Parajón-Costa, Enrique J. Baran

Biological Trace Element Research > 2013 > 155 > 2 > 295-300

Two structurally related vanadium(V) complexes, K₃[VO₂(C₂O₄)₂]·3H₂O and K₃[VO(O₂)(C₂O₄)₂]·1/2H₂O, were thoroughly characterized by infrared, Raman, and electronic spectroscopies. The effect of both complexes on the viability of the human MG-63 osteosarcoma cells was tested using the MTT assay. The monoperoxo complex shows a very strong antiproliferative activity (at 100-μM concentration, this complex...

article

Vibrational and electronic spectra of [Cu(l-ornithinato)2Cl2]·2H2O

Beatriz S. Parajón-Costa, Enrique J. Baran

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy > 2012 > 98 > Complete > 252-255

The FTIR and FT-Raman spectra of a Cu(II) complex of ornithine of composition [Cu(l-ornithinato) ₂ Cl ₂ ]·2H ₂ O were recorded and analyzed in relation to its structural peculiarities and by comparison with the spectra of ornithine hydrochloride and of other bis(amino acid) complexes of Cu(II). The electronic spectrum of the complex is also briefly discussed.

article

Spectroscopic Characterization of an Oxovanadium(IV) Complex of Oxodiacetic Acid and o-Phenanthroline. Bioactivity on Osteoblast-Like Cells in Culture

Ignacio E. León, Susana B. Etcheverry, Beatriz S. Parajón-Costa, Enrique J. Baran

Biological Trace Element Research > 2012 > 147 > 1-3 > 403-407

The oxovanadium(IV) complex of oxodiacetic acid (H₂ODA) and o-phenanthroline of stoichiometry [VO(ODA)(ophen)]⋅1.5H₂O, which presents the interesting tridentate OOO coordination, was thoroughly characterized by infrared, Raman, and electronic spectroscopies. The biological activity of the complex on the cell proliferation was tested on osteoblast-like cells (MC3T3E1 osteoblastic mouse calvaria-derived...

article

Vibrational spectra of double oxalates of the type MI2Cu(C2O4)2·2H2O (MI=Na+, K+, NH4+)

Daniel Palacios, Alejandra Wladimirsky, María C. D’Antonio, Ana C. González-Baró, more

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy > 2011 > 79 > 5 > 1145-1148

The infrared and Raman spectra of Na ₂ Cu(C ₂ O ₄ ) ₂ ·2H ₂ O, K ₂ Cu(C ₂ O ₄ ) ₂ ·2H ₂ O and (NH ₄ ) ₂ Cu(C ₂ O ₄ ) ₂ ·2H ₂ O were recorded and briefly discussed on the basis of their structural peculiarities and by comparison with the vibrational spectra of other metallic...

article

Vibrational spectra of the Ga(III) complexes with oxine and clioquinol

Claudia C. Wagner, Ana C. González-Baró, Enrique J. Baran

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy > 2011 > 79 > 5 > 1762-1765

The FTIR and FT-Raman spectra of the gallium(III) complexes of 8-hydroxyquinoline (oxine) and 5-chloro-7-iodo-8-hydroxyquinoline (clioquinol), were recorded and briefly discussed by comparison with the spectra of the uncoordinated ligands and with some related species.

article

Spectroscopic investigation of the VO2+/hyaluronate interaction

Patricia A.M. Williams, Enrique J. Baran

Carbohydrate Polymers > 2011 > 86 > 3 > 1385-1388

An oxovanadium(IV) complex was prepared by interaction of aqueous solutions of VOSO ₄ ·5H ₂ O and sodium hyaluronate, at controlled pH-values, under nitrogen atmosphere, and subsequent precipitation with absolute ethanol. The complex formation and the characteristics of the VO ²⁺ /hyaluronate interactions were confirmed by vibrational (IR and Raman) and UV–vis electronic absorption...

article

Vibrational spectra of bis(maltolato)oxovanadium(IV): A potent insulin mimetic agent

Beatriz S. Parajón-Costa, Enrique J. Baran

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy > 2011 > 78 > 1 > 133-135

The FTIR and FT-Raman spectra of the oxovanadium(IV) complex of 3-hydroxy-2-methyl-4-pyrone (maltol) bis(maltolato)oxovanadium(IV) were recorded and briefly discussed by comparison with the spectra of uncoordinated maltol and with some related species.

article

Synthesis and Characterization of Heteroleptic Copper and Zinc Complexes with Saccharinate and Aminoacids. Evaluation of SOD-like Activity of the Copper Complexes

Eduardo Santi, Inés Viera, Alvaro Mombrú, Jorge Castiglioni, more

Biological Trace Element Research > 2011 > 143 > 3 > 1843-1855

Five new copper and zinc heteroleptic complexes with saccharin and aminoacids with general stoichiometry Na₂[M(sac)₂(aa)₂]⋅nH₂O (M denotes Cu or Zn, sac the saccharinate ion, and aa the aminoacids) were synthesized and characterized by elemental and thermogravimetric analysis, conductimetric measurements and IR, Raman and UV–vis spectroscopies. In all the complexes, copper and zinc ions coordinated...

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Search results for: Enrique J. Baran

Metvan, bis(4,7-Dimethyl-1,10-phenanthroline)sulfatooxidovanadium(IV): DFT and Spectroscopic Study—Antitumor Action on Human Bone and Colorectal Cancer Cell Lines

Structural and IR-Spectroscopic Characterization of Aqua Lithium Acesulfamate, an Outlier of the M(ace), M: Na⁺, K⁺, Rb⁺, Cs⁺, Isomorphic Series

Crystal structure and spectroscopic behavior of synthetic novgorodovaite Ca₂(C₂O₄)Cl₂·2H₂O and its twinned triclinic heptahydrate analog

Natural iron oxalates and their analogous synthetic counterparts: A review

Vibrational spectra of oxo-, thio-, and selenometallates of transition elements in the solid state

Syntheses, Crystal Structures, NMR Spectroscopy, and Vibrational Spectroscopy of Sr(PO₃F)·H₂O and Sr(PO₃F)

Crystal and molecular structure and spectroscopic behavior of isotypic synthetic analogs of the oxalate minerals stepanovite and zhemchuzhnikovite

Vibrational spectra of the two hydrates of strontium oxalate

Synthesis, Crystal Structure, and Properties of Mn(PO₃F)(H₂O)₂

A New Oxidovanadium(IV) Complex of Oxodiacetic Acid and dppz: Spectroscopic and DFT Study. Antitumor Action on MG-63 Human Osteosarcoma Cell Line

Investigation on the bioactivities of clioquinol and its bismuth(III) and platinum(II,IV) complexes

Vibrational spectra of bis(maltolato)zinc(II), an interesting insulin mimetic agent

Bis(oxalato)dioxovanadate(V) and Bis(oxalato)oxoperoxo-vanadate(V) Complexes: Spectroscopic Characterization and Biological Activity

Vibrational and electronic spectra of [Cu(l-ornithinato)2Cl2]·2H2O

Spectroscopic Characterization of an Oxovanadium(IV) Complex of Oxodiacetic Acid and o-Phenanthroline. Bioactivity on Osteoblast-Like Cells in Culture

Vibrational spectra of double oxalates of the type MI2Cu(C2O4)2·2H2O (MI=Na+, K+, NH4+)

Vibrational spectra of the Ga(III) complexes with oxine and clioquinol

Spectroscopic investigation of the VO2+/hyaluronate interaction

Vibrational spectra of bis(maltolato)oxovanadium(IV): A potent insulin mimetic agent

Synthesis and Characterization of Heteroleptic Copper and Zinc Complexes with Saccharinate and Aminoacids. Evaluation of SOD-like Activity of the Copper Complexes

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