Showing papers by "Enrique J. Baran published in 2006"
TL;DR: In this paper, a wide variety of metal species based on mononuclear, binuclear, polynuclear complexes and extended coordination polymers are discussed in relation to the coordination modes of the anion, i.e., monodentate (through the N-atom or the carbonylic O-atom), bidentate, tridentate or bridge forming.
180 citations
TL;DR: The synthesis, characterization and comparative biological study of a series of antibacterial copper complexes with heterocyclic sulfonamides were reported, showing that the 3H2O presented the highest antimicrobial potency and a superoxide dismutase-like activity comparable with pharmacological active compounds.
109 citations
TL;DR: The crystal structure of [Cd(tsac)2(bzim)2]·CH3OH (tsac, anion of thiosaccharine; bzim, benzimidazole) has been determined by single crystal X-ray diffractometry as mentioned in this paper.
22 citations
TL;DR: In this article, the crystal structure of four new Cu(II)-dipeptide complexes were studied in solid state and in solution by infrared, electronic and EPR spectroscopic techniques.
20 citations
TL;DR: In this paper, a Pd(II) complex of the thiosaccharinato (tsac) anion, of stoichiometry 2·H2O was prepared by interaction of Na2PdCl4 with thioscarcharin in methanol and characterized by infrared and 1H and 13C NMR spectroscopy.
Abstract: A Pd(II) complex of the thiosaccharinato (tsac) anion, of stoichiometry Pd(tsac)2·H2O was prepared by interaction of Na2PdCl4 with thiosaccharin in methanol and characterized by infrared and 1H and 13C NMR spectroscopy. These spectral studies confirmed interaction of the metal center with the thiosaccharinate acting as a bidentate ligand through its thiol group and the N-atom. NMR measurements also confirmed that in solution thiosaccharin is mainly present in its thiolate tautomeric form.
16 citations
TL;DR: A series of ternary oxides of the type NaLnTiO 4 (with Ln = La, Nd, Sm, Eu, Gd, Dy, Y) and AgLn TiO 4 as mentioned in this paper have been prepared and their structures confirmed by X-ray powder diffractometry, and infrared spectra of these materials were recorded and briefly discussed on the basis of their structural peculiarities and by comparison with those of related oxides.
16 citations
TL;DR: Oxovanadium(IV) complexes of the polyalcohols sorbitol, galactitol, and mannitol, of stoichiometry Na(2)[VO(L)(2)].H(2)O, were obtained from aqueous alkaline solutions and exerted a biphasic effect on cell proliferation, being slight stimulating agents at low concentrations and inhibitory in the range of 25-100 microM.
14 citations
TL;DR: The powder Fourier transform (FT) infrared and Raman spectra of the new isotypic diarsenates RbScAs2O7, TlScAs 2O7 and (NH4)ScA 2O 7 are discussed with a factor group analysis in this article.
Abstract: The powder Fourier transform (FT) infrared and Raman spectra of the new isotypic diarsenates RbScAs2O7, TlScAs2O7, and (NH4)ScAs2O7 are discussed with a factor group analysis, on the basis of their known structural characteristics. The spectroscopic behavior clearly reflects all the structural peculiarities and also confirms the rotational quenching of the NH4+ cation in (NH4) ScAs2O7. The crystal structure of TlScAs2O7 is also reported for the first time and is briefly discussed. Copyright © 2006 John Wiley & Sons, Ltd.
14 citations
TL;DR: In this article, two new saccharinate/NH3 complexes were obtained and their crystal structures determined by single crystal X-ray diffractometry, and the magnetic moment and electron absorption spectrum were also recorded and briefly commented.
Abstract: Two new saccharinate/NH3 complexes of composition [Ni(sac)2(NH3)4] and [Zn(sac)2(NH3)2] were obtained and their crystal structures determined by single crystal X-ray diffractometry. The elongated octahedral NiII complex crystallizes in the monoclinic P21/c space group with Z = 2 whereas the tetrahedral ZnII complex is triclinic (space group and Z = 2). For [Ni(sac)2(NH3)4] the magnetic moment and electron absorption spectrum were obtained and discussed. The infrared spectra of both complexes were also recorded and briefly commented.
7 citations
TL;DR: The crystal structure of NH4[tsac]·H2O (tsac = anion of the thiosaccharin molecule) has been determined by single crystal X-ray diffractometry as discussed by the authors.
Abstract: The crystal structure of NH4[tsac]·H2O (tsac = anion of the thiosaccharin molecule) has been determined by single crystal X-ray diffractometry. It crystallizes in the orthorhombic space group Pbca with Z = 8. The infrared spectrum of the compound was also recorded and its most important features discussed on the basis of its structural peculiarities.
6 citations
TL;DR: In this paper, the powder Fourier transform (FT) infrared and Raman spectra of ScAsO4·H2O were recorded and discussed with a factor-group analysis based on of its known structural characteristics.
Abstract: The powder Fourier-transform (FT) infrared and Raman spectra of ScAsO4· H2O were recorded and are discussed with a factor-group analysis based on of its known structural characteristics.
Copyright © 2006 John Wiley & Sons, Ltd.
TL;DR: The results of this study suggest that DMSA might be a potentially useful detoxification agent for vanadium.
Abstract: The interaction of the VO2+ cation with meso-2,3-dimercaptosuccinic acid (DMSA) was investigated by electron absorption spectroscopy in aqueous solution at different pH values. The spectral behavior, complemented with a spectrophotometric titration, shows the generation of a [VO(DMSA)2]2− complex in which the oxocation interacts with two pairs of deprotonated-SH groups of the acid. It was also found that DMSA rapidly reduces VO3− to VO2+, which might be chelated by an excess of the acid. DMSA can also produce the partial reduction of a V2O5 suspension at pH=5.2. The results of this study suggest that DMSA might be a potentially useful detoxification agent for vanadium.
TL;DR: The Raman spectrum of crystalline thiosaccharin was recorded and assigned by comparison with known IR spectroscopic data derived from experimental as well as theoretical studies as discussed by the authors.
Abstract: The Raman spectrum of crystalline thiosaccharin was recorded and assigned by comparison with known IR spectroscopic data derived from experimental as well as theoretical studies. Copyright © 2006 John Wiley & Sons, Ltd.
TL;DR: In this paper, the infrared spectra of large oxides of the type AgLnIIITiO4 (with Ln = La, Nd, Sm, Eu, Gd, Dy, Y) and their unit cell parameters were determined by X-ray powder diffractometry.
Abstract: Ternary oxides of the type AgLnIIITiO4 (with Ln = La, Nd, Sm, Eu, Gd, Dy, Y) have been prepared and their unit cell parameters determined by X-ray powder diffractometry. They are related to the K2NiF4 structural type, with the AgI and LnIII cations distributed in an ordered way on the K-sub lattice. The infrared spectra of these materials were recorded and discussed on the basis of their structural peculiarities and by comparison with those of related oxides. They show a close relationship with the parent NaLnIIITiO4 materials.
TL;DR: In this article, the infrared and 57 Fe-Mossbauer spectra of Fe 3 II Fe 4 III (AsO 4 ) 6 were recorded and analyzed on the basis of its structural characteristics.
TL;DR: In this paper, a dark-red single crystal of HgCr2O7 was grown by reacting HgO and CrO3 in excess at 200°C for four days and the crystal structure was determined from a crystal twinned by merohedry according to (110).
Abstract: Dark-red single crystals of HgCr2O7 were grown by reacting HgO and CrO3 in excess at 200°C for four days. The crystal structure (space group P32, Z = 3, a = 7.2389(10), c = 9.461(2) A, 1363 structure factors, 57 parameters, R[F2>2σ(F2)] = 0.0369, wR(F2 all) = 0.0693) was determined from a crystal twinned by merohedry according to (110). It consists of nearly linear HgO2 units (\({\bar {d}}\)(Hg–O) = 2.02 A) and dichromate units that are linked into infinite chains ‘O3Cr–O–CrO3–Hg–O3Cr–O–CrO3’ running parallel to the c-axis. Six additional Hg–O contacts between 2.73 and 2.96 A stabilise the structural arrangement. The dichromate anion exhibits a staggered conformation with a bent Cr–O–Cr bridging angle of 140.7(6)°. Upon heating above 300°C, HgCr2O7 decomposes in a two-step mechanism to Cr2O3. The title compound was additionally characterised by vibrational spectroscopy.
Journal Article•
TL;DR: In this paper, N-aralkyl substituted 2-aminoindans were examined as D 2 dopamine receptor antagonist variants for better understanding of the recognition process at submolecular level.
Abstract: In order to better understand, at submolecular level, the minimal structural requirements for the recognition process in the inhibitor activity, N-aralkyl substituted 2-aminoindans were examined as D 2 dopamine receptor antagonist variants. Semiempirical (AM1) and ab- initio (RHF/3-21G and RHF/6-31G(d)) calculations were performed for a better understanding of the recognition process at submolecular level. Using the above-mentioned computational model, we were able to interpret the basic behavior and predict some additional features of N-aralkylsubstituted 2-aminoindans-Dopamine D 2 receptor interaction.