Showing papers by "Oscar E. Piro published in 2003"
TL;DR: In this article, the synthesis and characterization of a series of new Ru(II) complexes with different antitrypanosomal active compounds is presented, where ruthenium clotrimazole complexes are more active against Trypanosoma cruzi, causative agent of Chagas' disease, than the corresponding free ligand.
52 citations
TL;DR: The crystal structures of [Cd(tsac)2(im)2] (1) (tsac=anion of thiosaccharine; im=imidazole) and of (Him)[cd(tac)3(H2O)] (2) (imizolium cation) have been determined at 120 K by single crystal X-ray diffractometry as discussed by the authors.
37 citations
TL;DR: In this paper, the synthesis and molecular structures of three metal-II derivatives of lutidinic acid are presented (lutidinic acid=2,4-pyridinedicarboxylic acid=H22,4pydc).
30 citations
TL;DR: The molecular structure of [Cu(sulfadimet)(2)].SO(CH(3))(2) (sulf adimethoxine=4-p-aminobenzenesulfonamido-2,6-dimethoxypyrimidine) was determined by single crystal X-ray diffractometry by determining the structural peculiarities of the complex.
29 citations
TL;DR: The title compound of as discussed by the authors crystallizes in the triclinic space group \(P\bar 1\), with a = 8.6161(4) A, b = 10.591(1) A and c = 11.406(1)-A. Partial deuteration of the substance indicates that the coordinated water molecules are strongly asymmetric, forming weak hydrogen bonds with acceptor oxygen atoms.
Abstract: The title compound crystallizes in the triclinic space group \(P\bar 1\), with a = 8.6161(4) A, b = 10.591(1) A, c = 11.406(1) A, α = 67.976(7)°, β = 86.868(6)°, γ = 67.798(6)°, and Z = 1. The structure was refined to R1 = 0.0413. The decavanadate anion V10O286− and the [Na2(H2O)10]2+ bridged cation are located at inversion centers. Partial deuteration of the substance indicates that the coordinated water molecules are strongly asymmetric, forming weak hydrogen bonds with acceptor oxygen atoms from the decavanadate anion. The infrared and Raman spectra are dominated by the water and decavanadate anion bands.
19 citations
TL;DR: In this paper, the reaction of lapachol, 2-hydroxy-3-(3-methyl-2-butenyl)-1,4-naphtoquinone, C15H14O3, with zinc acetate, in ethanol, produces a chelate formula Zn(C15H13O3)2(C2H6O)2, whose structure has been determined by single crystal X-ray diffraction.
Abstract: The reaction of lapachol, 2-hydroxy-3-(3-methyl-2-butenyl)-1,4-naphtoquinone, C15H14O3, with zinc acetate, in ethanol, produces a chelate formula Zn(C15H13O3)2(C2H6O)2, whose structure has been determined by single crystal X-ray diffraction. It pertains to the triclinic system, space group P I (No. 2), a = 8.2380(3) A, b = 9.4900(2) A, c = 11.0110(4) A, α = 112.536(2)°, β = 91.204(2)°, γ = 92.664(2)°, Z = 1. Some spectroscopic and chemical properties of the complex are also reported.
19 citations
TL;DR: In this paper, the crystal structures of two Thallium(I)-Thiosaccharinat-Komplexes have been determined at 116 K by single crystal X-ray diffractometry.
Abstract: The crystal structures of [Tl(tsac)] (1) and [Tl(tsac)(ophen)] (2) (tsac = anion of thiosaccharin; ophen = 1, 10 phenanthroline) have been determined at 116 K by single crystal X-ray diffractometry. Complex 1 crystallizes in the monoclinic space group P21/a with Z = 4 and complex 2 in the monoclinic space group C2/c with Z = 8.In both complexes TI is coordinated to a thiosaccharinate anion through its sulphur and nitrogen atoms. A distorted eight fold coordination sphere around the cation in complex 1 is completed with two other longer Tl-S bonds and four Tl···O contacts with five symmetry related neighbouring thiosaccharinate anions. A phenanthroline molecule acting as a bidentate ligand through its nitrogen atoms completes a four-fold coordination around the metal atom in complex 2. The infrared spectra of both complexes were also recorded and their most important features discussed on the basis of its structural peculiarities.
Kristallographische und spektroskopische Charakterisierung von zwei neuen Thallium(I)-Thiosaccharinat-Komplexen
Die Kristallstrukturen von [Tl(tsac)] (1) und [Tl(tsac)(ophen)] (2) (tsac = Anion von Thiosaccharin; ophen = 1, 10 Phenanthrolin) wurden rontgenographisch, bei 116 K, an Einkristallen bestimmt. Komplex 1 kristallisiert in der monoklinen Raumgruppe P21/a mit Z = 4 und Komplex 2 in the monoklinen Raumgruppe C2/c mit Z = 8. In beiden Komplexen ist TlI an ein Thiosaccharinat-Anion uber das Schwefel- und das Stickstoffatom koordiniert. Im Komplex 1 ist eine verzerrte achtfache Koordinationssphare um das TlI Ion zu erkennen, welche durch zwei weitere und langere Tl-S-Bindungen und vier Tl···O-Kontakte, die von funf weiteren symmetrie-bezogenen Thiosaccharinat-Ione, stammen. Im Komplex 2 wird die vierfache Koordinationssphare um das Kation durch ein Phenanthrolin-Molekul erweitert, welches als zweizahniger Ligand uber seine Stickstoffatome fungiert. Die Infrarotspektren beider Komplexe wurden aufgenommen und ihre wichtigsten Aspekte an Hand der Strukturbesonderheiten analysiert.
18 citations
TL;DR: In this article, the synthesis and characterization of the first Re complexes with semicarbazone ligands is presented. But the Re(V) ion is in a distorted octahedral environment, equatorially coordinated to a deprotonated semicarazone molecule acting as a bidentate ligand through its carbonylic oxygen and azomethynic nitrogen atoms, to an oxo ligand and a chlorine atom.
Abstract: The synthesis and characterization of the first two Re complexes with semicarbazone ligands is presented. Selected ligands are 5-Nitro-2-furaldehyde semicarbazone (Nitrofurazone) (L1) and its derivative 3-(5-Nitrofuryl)acroleine semicarbazone (L2). Complexes of general formula [ReVOCl2(PPh3)L], where L = L1 and L2, were prepared in good yields and high purity by reaction of [ReVOCl3(PPh3)2] with L in ethanol or methanol solutions. The complexes formula and molecular structures were supported by elemental analyses and electronic, FTIR, 1H, 13C and 31P NMR spectroscopies. In addition, the crystal and molecular structure of [ReVOCl2(PPh3)L2] was determined by X-ray diffraction methods. [ReOCl2(PPh3)(3-(5-Nitrofuryl)acroleine semicarbazone)] crystallizes in the space group P-1 with a = 11.2334(2), b = 11.3040(2), c = 12.5040(2) A, α = 81.861(1), β = 63.555(1), γ = 83.626(1)°, and Z = 2. The Re(V) ion is in a distorted octahedral environment, equatorially coordinated to a deprotonated semicarbazone molecule acting as a bidentate ligand through its carbonylic oxygen and azomethynic nitrogen atoms, to an oxo ligand and a chlorine atom. The six-fold coordination is completed by another chlorine atom and a triphenylphosphine ligand at the axial positions.
Neue Rhenium(V)-Nitrofuryl-semicarbazon-Komplexe. Kristallstruktur von [ReOCl2(PPh3){3-(5-Nitrofuryl)acrolein-semibarbazon}]
Die Synthese und die Charakterisierung der ersten beiden Re-Komplexe mit Semicarbazon-Liganden wird beschrieben. Die ausgewahlten Liganden sind 5-Nitro-2-furaldehyd-semicarbazon (Nitrofurazon) (L1) und sein Derivat 3-(5-Nitrofuryl)acrolein-semicarbazon (L2). Die Komplexe der allgemeinen Formel [ReVOCl2(PPh3)L] mit L = L1 und L2 wurden in guten Ausbeuten und hoher Reinheit durch Reaktion von [ReVOCl3(PPh3)2] mit L in Ethanol- oder Methanollosungen hergestellt. Die Komplexformeln und die Molekulstrukturen werden durch Elementaranalysen und Elektronen-FTIR-, 1H-, 13C- und 31P-NMR-Spektroskopie gestutzt. Zusatzlich wird die Kristall- und Molekulstruktur von [ReVOCl2(PPh3)L2] durch Rontgenmethoden ermittelt. [ReOCl2(PPh3){3-(5-Nitrofuryl)acrolein-semicarbazon}] kristallisiert in der Raumgruppe P1¯ mit a = 11, 2334(2); b = 11, 3040(2); c = 12.5040(2) A; α = 81, 861(1); β = 63, 555(1); γ = 83, 626(1)° und Z = 2. Das Rheniumatom befindet sich in verzerrt oktaedrischer Umgebung, es ist aquatorial durch den deprotonierten, als zweizahnig fungierenden Semicarbazon-Liganden mittels des Carbonylsauerstoffatoms und des Azomethin-Stickstoffatoms koordiniert sowie durch den Oxo- und einen Chloroliganden. Die Sechsfachkoordination wird durch ein weiteres Chloratom und durch den Triphenylphosphin-Liganden in den Axialpositionen erganzt.
17 citations