Browsing by Author "Peña, Octavio"
Now showing items 1-19 of 19
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(Sociedad Chilena de Química, 1988)Se han determinado las propiedades magnéticas y espectroscópicas de los complejos de cobre (II) con bases de Schiff,[Cu(BS)Cl2]. Las bases de Schiff son: N-R-Salicilaldimina, donde R es 2-piridina: 4-metil-2-piridina; o ...
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(ELSEVIER SCIENCE SA, 2005-04-15)Four lanthanide coordination polymers formulated as {[La3L9(H2O)(3)](EtOHH2O)-H-.}(n)1,{[Pr2L6(H2O)(2)](HLH2O)-H-.}(n)2,{[Dy2L6(H2O)]0.5HL(.)H(2)O}n 3 and {[Ho2L6(H2O)]0.5HL.H2O}(n) 4 and HL = trans-2-butenoic acid have ...
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(2009)O tiofosfato quaternário de metal alcalino e terra rara K4Sm2[PS4]2[P2S6] foi sintetizado pelo método cerâmico e caracterizado por difratometria de raios X de pó (XRD), microscopia eletrônica de varredura com microanálise ...
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(Universidad de Chile., 1972)El problema dé impurezas magnéticas a bajas concentraciones ha motivado el presente trabajo sobre medición de resistividad eléctrica a temperaturas de He líquido. Estas mediciones servirán de complemento a las mediciones ...
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(ELSEVIER SCIENCE, 2003-11-20)Homometallic europium(III) and terbium(III) trans-2-butenoate polymers, chemical formulas [{Eu-3(MeCH=CHCO2)(9)(H2O)(4)}.H2O-EtOH](n) (1) and [{Tb(MeCH=CHCO2)(3)(H2O)}.MeCH=CHCO2H](n) (2) and their dimeric 1,10-phenanthroline ...
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(AMER CHEMICAL SOC, 2005-11-28)A new lanthanide citrate motif of general formula [Ln(Hcit)(H2O)(2)center dot H2O](n), where Ln = Gd (1) and Nd (2) and HCit(3-)= C(OH)(COO-)(CH2COO-)(2), has been synthesized hydrothermally from Ln(2)O(3) and citric acid ...
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(ELSEVIER SCIENCE BV, 2006-10-01)Partial substitutions of Mn by a transition metal Me in the rare-earth manganites REMexMn1-xO3 results in the simultaneous presence of Mn3+ and Mn4+, triggering double exchange ferromagnetic mechanisms. The RE sublattice ...
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(1996)The preparation of the copper(II) complex formulated as [Cu(DPA)(Ac)2]·2H2O is given (DPA: di(2-pyridyl)amine, Ac: acetate). The structure of this complex was determined by single-crystal X-ray analysis. It crystallizes ...
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(2009)The (Mn1−xCdx)Cr2S4 phases (0≤x≤0.6) have been synthesized from the corresponding elements at 1123 K. These sampleswere characterized by powder X-ray diffraction (XRD) and magnetic susceptibility. The(Mn1−xCdx)Cr2S4 ...
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(SOC CHILENA QUIMICA, 2008-06)The preparation, magnetic characterization and antimicrobial properties of the complexes [Fe3O(CH3COO)(6)(CH3COOH)(H2O)]Cl(Melmid)center dot(H2O) (1) and [Fe4O2 (CH3COO)(7)O-2(BPA)(2)(H2O)]center dot Cl center dot ...
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(ELSEVIER, 2006-10-01)Magnetic properties of sulfide spinels derived from the lutetium manganese thiospinel MnLu2S4 are reported. In this first approach, we have partially substituted lutetium by other lanthanides or by some transition metal ...
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Magnetic properties and antibacterial activity of tetranuclear copper complexes bridged by oxo group (SOCIEDAD CHILENA DE QUIMICA, 2006-09)A series of three tetranuclear Cu(II) complexes of general formula [Cu4OCl6L4], where L is a Lewis Base ligand has been characterized through magnetic measurements and determination of antimicrobial activities. This study ...
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(PERGAMON-ELSEVIER SCIENCE LTD, 2006-07-10)A group of dinuclear copper(II) compounds containing the macrocyclic complexes Cu2L2+ (LH2 = C(24)H(2)sN(4)O(4): a ligand derived from the condensation of 4-methyl-2,6-diformylphenol with 1,3-diamine-2-propanol) have been ...
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(SOCIEDAD CHILENA DE QUIMICA, 2004-12)The crystal structure of the compound with empirical formula [Cu (2,2'-BP)Cl NO3](2) (BP: 2,2'-bipyridine) (1) has been determined. Crystals are triclinic, space group P-1 with a = 7.5152(12) (A) over circle, b = 9.2531(14) ...
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(Elsevier, 2004-05-10)Five new lanthanide complexes displaying crotonato bridges have been prepared: [Gd-2(crot)(6)(H2O)(4)]-4(bpa) (1); [Ho-2(crot)(6)](n)(.)(Hbpa) (2), [Gd-2(crot)(6)(bipy)(2)] (3); [Ho-2(crot)(6)(bipy)(2)] (4) and ...
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(ELSEVIER, 2005-09-01)The crystal structure and magnetic characterization of an isostructural series of general formula {[Ln(crot)(3)(H2O)(bpy)(1/2)](2)}(n) (crot, crotonate (C4H5O2); bpy, 4,4'-bipyridine (C10H8N2); Ln, Nd, Gd, Ho, Er, Y) is ...
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(2014)The crystalline structure of spinels is extremely flexible due to the presence of several sublattices in which the cations can be distributed and localized in different crystallographic sites depending on their sizes, ...
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(2007)Two polymorphic forms of a mixed zinc/copper biquinoline dihydrogenphosphate are presented, showing almost identical monomeric units, viz. (2,2 '-biquinoline-kappa N-2,N ')bis(dihydrogenphosphato-kappa O)copper(II)/zinc(II), ...
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(BLACKWELL, 2006-09)In the title monomer, [Cu(NO3)(2)(C24H16N2)(2)], the copper(II) cation is eight-coordinate within an octahedral-like polyhedron. The coordination polyhedron is formed by two chelating diphenylphenanthroline groups that de ...
