Roberto Cortes

University of the Basque Country, Euskal Herriko Unibertsitatea, Inorganic Chemistry, Faculty Member

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Papers by Roberto Cortes

Crystal structure, spectroscopic and magnetic studies, and antioxidative properties of catena-[diaqua(dihydro-orotato)manganese(II)]

Canadian Journal of Chemistry, 1998

The polynuclear manganese(II) complex of L-dihydroorotic acid has been synthesized and characteri... more The polynuclear manganese(II) complex of L-dihydroorotic acid has been synthesized and characterized by X-ray crystallography, UV-visible spectroscopy, and magnetic susceptibility measurements. Crystal data: triclinic, space group P1 bar , a = 4.7239(5) Å, b = 7.902(1) Å, c = 10.552(2) Å, α = 105.80(1)°, β = 98.864(7)°, γ = 104.69(1)°, V = 355.9(1) D 3, Z = 1, R = 0.035, Rw = 0.028. This complex consists of polymer chains of manganese atoms that are bound together via carboxylate bridges with a Mn . . .Mn distance in the chain of 4.724 D . The radical scavenging properties of the complex have been evaluated by ESR spectroscopy and cyclic voltammetry methods and compared to those of vitamin E and BHT (2,6-di-tert-butyl-4-methylphenol).Key words: orotic acid, L-dihydroorotic acid, manganese(II) complex, antioxidative properties.

A ferromagnetic copper(II)-vanadium(IV) oxide .mu.-oxalato complex: crystallographic structure and spectroscopic and magnetic properties

Inorganic Chemistry, 1994

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Crystal data for [Cu(LIII)XY]·nH2O compounds [LIII=pymep, terpy; X=I, N3; Y=I, NO3, PF6; n=0,1]

Powder Diffraction

Three new compounds of generalised formula [Cu(LIII)XY]·nH2O [LIII=pymep, terpy; X=I, N3; Y=I, NO... more Three new compounds of generalised formula [Cu(LIII)XY]·nH2O [LIII=pymep, terpy; X=I, N3; Y=I, NO3, PF6; n=0,1], pymep (C14H15N3)=N-(6methyl–2-pyridyl–methylene) -2-(2-pyridyl)-ethylamine and terpy (C15H11N3)=2,2′;6′,2″-terpyridine have been prepared by reaction in solution. Crystal data were determined by single-crystal methods. Powder diffraction data and densities determined by a flotation method are also presented.

Structural analysis and magnetic properties of the 1D [Fe(dca)2bipy(H2O)]??1/2H2O and the 3D [Ni(dca)2bipy]??(dca = dicyanamide; bipy = 4,4???-bipyridine)

Journal of the Chemical Society Dalton Transactions, 2002

Structure of monoaquabis(isocyanato)(2,2':6',2''-terpyridyl)nickel(II)

Acta Crystallogr C Cryst Str, 1988

Synthetic Strategy, Magnetic and Spectroscopic Properties of the Terpyridine Complexes [Cu(terpy)X(H2O)n]Y (X= NCO, NCS or N3; n= 0 or 1; Y= NO3 or PF6). Crystal Structures of the Azidenitrate and AzideHexafluorophosphate

Journal of the Chemical Society Dalton Transactions, 1993

... Crystal Structures of the Azidenitrate and Azidehexaf Iuoro-phosphate t Roberto Cortes,a M. K... more

Sythesis and crystal structure of a new nickel(II)-terpyridine complex: [Ni(terpy)(NO2)(ONO)(H2O)]

Polyhedron, 1986

The compounds Ni(terpy)Cl,-3H20 and NaN02 react readily in aqueous solution to give the complex [... more The compounds Ni(terpy)Cl,-3H20 and NaN02 react readily in aqueous solution to give the complex [Ni(terpy)(NO,)(ONO)(H,O)], which has been structurally characterized by an X-ray diffraction study. The hexacoordinate nickel atom bonds to three nitrogen atoms of the terpyridine ligand, to a "nitro" group, to a "nitrite" group and to a water molecule. Distortion from an octahedron to a trigonal prism, for the complex, has been evaluated. An infrared study of the complex has been carried out and shows bands of nitro and nitrite coordination. Magnetic study reveals a Curie-Weiss behavior, giving an effective magnetic moment at room temperature 3.12 B.M.

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Di-�-chloro-bis[(diethylenetriamine)copper(II)] Dinitrate

Acta Crystallogr C Cryst Str, 1996

A novel u-N-cyanate-bridged nickel dimer exhibiting ferromagnetic coupling: Di-u-cyanate-bis(aqua¬=2,2':6'-2″-terpyridine) dinickel (II) hexafluorophosphate

Transition Metal Chemistry, 1986

A Novel wN-Cyanate-Bridged Dimer Exhibiting Ferromagnetic Coupling: Di- t-cyanate-bis(aqua-2,2" 6',2"-terpyridine)dinickel(II) Hexafluorophosphate

Transit Metal Chem, 1986

Dicubane-like Tetrameric Cobalt(II)-Pseudohalide Ferromagnetic Clusters

Inorg Chem, 2001

Three tetrameric cobalt(II)-pseudohalide complexes have been structurally and magnetically charac... more Three tetrameric cobalt(II)-pseudohalide complexes have been structurally and magnetically characterized. Compounds 1 and 2 are isomorphous and exhibit the general formula [Co2(dpk-OH)(dpk-CH3O)(L)(H2O)]2A2-4H2O where dpk = di-2-pyridyl ketone, L = N3(-) and A = BF4(-) for 1, and L = NCO(-) and A = ClO4(-) for 2. The ligands dpk-OH(-) and dpk-CH3O(-) result from solvolysis and ulterior deprotonation of dpk in water and methanol, respectively. Both compounds exhibit cationic tetramers consisting of a dicubane-like core with two missing vertexes where the Co(II) ions are connected through end-on pseudohalide and oxo-bridges. A similar tetranuclear core has been found for 3 whose formula is [Co2(dpk-OH)(dpk-CH3O)(NCO)2]2. In this case, the tetramers are neutral and exhibit a terminal cyanate in place of the coordinated molecule of water for 1 and 2. The tetrameric units for 2 and 3 represent the first examples of any kind of cubanes exhibiting cyanate bridges as well as the first Co(II) compounds exhibiting intermetallic bridges through these pseudohalide groups. Measurements of the magnetic susceptibility indicated the presence of ferromagnetic Co(II)-Co(II) interactions in the three compounds.

Donn�es crystallographiques sur les compos�s Ni(C15H11N3) X2.nH2O,X=Cl-,NO2-,NCO

J Appl Cryst, 1985

Di-μ-chloro-bis[(diethylenetriamine)copper(II)] Dinitrate

Acta Crystallographica Section C Crystal Structure Communications, 1996

ABSTRACT The crystal structure of the title compound, di-mu-chlorobis{[N-(2-aminoethyl)-1,2-ethan... more ABSTRACT The crystal structure of the title compound, di-mu-chlorobis{[N-(2-aminoethyl)-1,2-ethanediamine-N,N&#39;,N&#39;&#39;]-copper(II)} dinitrate, [Cu2Cl2(dien)(2)](NO3)(2) (dien is diethylenetriamine; C4H13N3), consists of chloride- bridged copper(II) dimers. Each copper ion is five-coordinate with geometry that is approximately square-pyramidal. Hydrogen bonding involving the three O atoms of the nitrate counteranions and the three H atoms of the amine groups of the organic ligand stabilizes the crystal packing.

The Azido Ligand: A Useful Bridge for Designing High-Dimensional Magnetic Systems

ACS Symposium Series, 1996

ABSTRACT Designing new high-dimensional magnetic molecular systems built from coordination compou... more ABSTRACT Designing new high-dimensional magnetic molecular systems built from coordination compounds has recently been a point of attention for inorganic chemists. The variety of coordination chemistry provides the synthesizers with a useful tool to build magnetic molecular architectures interesting for their properties, which arise from the interaction among their subunits. Strategies based on the reaction of appropriate terminal and bridging ligands with paramagnetic metal ions allow the preparation of oligomeric species whose nuclearity and magnetic properties may, in any sense, be tailored (1). By using good superexchange bridging groups such as oxalate or cyanide, extended lattices of antiferromagnetic or ferrimagnetic systems which show magnetic order at low temperatures have been achieved (2,3). In this way, the azido ligand represents a good choice for the design of new magnetic systems. This ligand is able to give ferromagnetic exchange interactions (through its end-on (EO) coordination mode) and antiferromagnetic ones (through the end-to-end (EE)

The 2D and 3D Compounds [M2bpm(dca)4]·nH2O (M = Ni, Zn; bpm = bipyrimidine; dca = dicyanamide;n = 0, 1) − Structural Analysis and Magnetic Properties

Eur J Inorg Chem, 2001

ABSTRACT The combined use of bpm (2,2′-bipyrimidine) and dca (dicyanamide) has led to the prepara... more ABSTRACT The combined use of bpm (2,2′-bipyrimidine) and dca (dicyanamide) has led to the preparation of two compounds of general formula [M2bpm(dca)4]·nH2O. Compound 1 (M = Ni, n = 1) exhibits a 2D layered structure based on ladder-like moieties. These units, whose steps are bpm groups, extend through single dca bridges, the connection between distinct ladder-like units taking place through double dca bridges. Compound 2 (M = Zn, n = 0) consists of a 3D structure based on the same type of ladder-like moieties that are connected to another four on the plane perpendicular to the extension of the ladders.

Ferromagnetic interactions in the first dicubane-type complex involving cyanate ligand: [Co4(dpk-OH)2(dpk-OMe)2(NCO)4]

Chem Commun, 2001

The ligands cyanate and di-2-pyridyl ketone (dpk) are used to construct a tetranuclear cobalt(II)... more

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Organic–inorganic Mn(II)-cyanate compound with five dispositions of bpa ligand

Acta Crystallographica Section A Foundations of Crystallography, 2011

Porosity and sorption processes represent one of the most stimulating current areas of research a... more Porosity and sorption processes represent one of the most stimulating current areas of research activity in the field of materials chemistry, in particular when using metal-organic frameworks (MOFs) [1]. Following our ongoing research focused on the development of functional MOFs, we report the synthesis, full structural characterization, porosity measurements and ion exchange properties of a new porous MOF with Ce 3+ [2, 3].

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Aqua(dicyanamido-κN1)(nitrato-κ2O,O′)(2,3,5,6-tetra-2-pyridylpyrazine-κ3N2,N1,N6)manganese(II)

Estudio cristalográfico, espectroscópico y magnético del compuesto [Co(dpk.OH)(dpk.OCH3)(NCO)2)]2

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Organic–inorganic Mn(II)-cyanate compound with five dispositions of bpa ligand

Acta Crystallographica Section A Foundations of Crystallography

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