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Research Interests:
The syntheses, crystal structures and magnetic properties of four rhenium(IV) compounds of formulae NBu4[ReCl5(pyzCOOH)]·H2O (1), [ReCl5(µ-pyzCOO)M(dmphen)2]·2CH3CN [M = Ni (2) and Co (3)] and {[ReCl5(µ3-pyzCOO)]2Mn2(dmphen)3}n (4) (NBu4... more
The syntheses, crystal structures and magnetic properties of four rhenium(IV) compounds of formulae NBu4[ReCl5(pyzCOOH)]·H2O (1), [ReCl5(µ-pyzCOO)M(dmphen)2]·2CH3CN [M = Ni (2) and Co (3)] and {[ReCl5(µ3-pyzCOO)]2Mn2(dmphen)3}n (4) (NBu4 = tetra-n-butylammonium cation, pyzCOOH = 2-pyrazinecarboxylic acid, dmphen = 2,9-dimethyl-1,10-phenanthroline) are reported herein. Compound 1 was obtained by the reaction of NBu4[ReCl5(dmf)] (dmf = dimethylformamide) with pyzCOOH in acetone, whereas the other complexes were obtained by the reaction of 1 with M(ClO4)2·6H2O [M = Ni (2), Co (3), Mn (4)] and dmphen in acetonitrile. Complex 1 is a mononuclear compound, 2 and 3 are neutral heterodinuclear complexes and 4 is a neutral chain in which each pyzCOO– bridges one ReIV and two MnII in a very unusual µ3-binding mode. Compounds 2 and 3 behave as magnetically isolated species with intramolecular ferromagnetic coupling between ReIV and NiII or ReIV and CoII ions, respectively. In turn, weak antiferromagnetic coupling between the MnII ions through anti-syn-carboxylate bridges together with weak ferromagnetism below 3.1 K due to small spin canting is observed in 4.
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Research Interests:
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An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely... more
An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely... more
An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely... more
An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely... more
An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely... more
An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely... more
An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely... more
An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Two new mixed-valence iron complexes with 2-pyridyl oximes, [Fe(mpko)<sub>3</sub>Fe(H<sub>2</sub>O)<sub>2</sub>(NO<sub>3</sub>)](NO<sub>3</sub>)·2H<sub>2</sub>O... more
Two new mixed-valence iron complexes with 2-pyridyl oximes, [Fe(mpko)<sub>3</sub>Fe(H<sub>2</sub>O)<sub>2</sub>(NO<sub>3</sub>)](NO<sub>3</sub>)·2H<sub>2</sub>O (<b>1</b>) (mpko<sup>−</sup> = methyl(2-pyridyl)ketone oximate) and [{Fe(dpko)<sub>3</sub>}<sub>2</sub>Fe](ClO<sub>4</sub>)·4H<sub>2</sub>O (<b>2</b>) (dpko<sup>−</sup> = bis(2-pyridyl)ketone oximate), have been prepared by reaction of Fe<sup>III</sup> with mpkoH in methanol (<b>1</b>) and Fe<sup>II</sup> with dpkoH in methanol/water (<b>2</b>). Dinuclear Fe<sup>II</sup>(low-spin)Fe<sup>III</sup>(high-spin) and trinuclear Fe<sup>II</sup>(low-spin)Fe<sup>III</sup>(high-spin)Fe<sup>II</sup>(low-spin) cations are present in the crystal structure of <b>...
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Two new mixed-valence iron complexes with 2-pyridyl oximes, [Fe(mpko)<sub>3</sub>Fe(H<sub>2</sub>O)<sub>2</sub>(NO<sub>3</sub>)](NO<sub>3</sub>)·2H<sub>2</sub>O... more
Two new mixed-valence iron complexes with 2-pyridyl oximes, [Fe(mpko)<sub>3</sub>Fe(H<sub>2</sub>O)<sub>2</sub>(NO<sub>3</sub>)](NO<sub>3</sub>)·2H<sub>2</sub>O (<b>1</b>) (mpko<sup>−</sup> = methyl(2-pyridyl)ketone oximate) and [{Fe(dpko)<sub>3</sub>}<sub>2</sub>Fe](ClO<sub>4</sub>)·4H<sub>2</sub>O (<b>2</b>) (dpko<sup>−</sup> = bis(2-pyridyl)ketone oximate), have been prepared by reaction of Fe<sup>III</sup> with mpkoH in methanol (<b>1</b>) and Fe<sup>II</sup> with dpkoH in methanol/water (<b>2</b>). Dinuclear Fe<sup>II</sup>(low-spin)Fe<sup>III</sup>(high-spin) and trinuclear Fe<sup>II</sup>(low-spin)Fe<sup>III</sup>(high-spin)Fe<sup>II</sup>(low-spin) cations are present in the crystal structure of <b>...
En las ultimas decadas, ha existido un creciente interes por la fabricacion, sintesis y preparacion de nanoparticulas bimetalicas (compuestas por dos elementos metalicos diferentes). Al combinar dos metales en estos nanomateriales, su... more
En las ultimas decadas, ha existido un creciente interes por la fabricacion, sintesis y preparacion de nanoparticulas bimetalicas (compuestas por dos elementos metalicos diferentes). Al combinar dos metales en estos nanomateriales, su desempeno mu¬chas veces supera las propiedades asociadas con sus contrapartes monome¬talicas, y cambiando sus componentes y morfologias se puede modificar exitosamente su desem¬peno fisico, electrico o quimico. Ampliando de esta manera su campo de aplicacion a areas tales como administracion de farmacos, optica-electronica, biosensores, separacion quimica, materiales, biotecnologia, nanoactuadores, bioimagen y bioterapia. La versatilidad de poder entender como combinar distintos elementos metalicos, en diferentes proporciones, a nivel nanometrico y de forma controlada, constituye un nuevo paradigma en la ingenieria de nanomateriales. In recent decades, there has been a growing interest in the manufacture, synthesis and preparation of bimetallic nanopar...
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Zinc borates are important materials. We report the preparation of three novel ones: [Zn(NH3)3B4O5(OH)4]·H2O (ZB1), Zn3(H2B3O7)2·2NH3·4H2O (ZB2), and [Zn(NH3)4][B4O5(OH)4]·4H2O (ZB3).
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Research Interests:
Abstract Two new mixed-valence iron complexes with 2-pyridyl oximes, [Fe(mpko)3Fe(H2O)2(NO3)](NO3)·2H2O (1) (mpko− = methyl(2-pyridyl)ketone oximate) and [{Fe(dpko)3}2Fe](ClO4)·4H2O (2) (dpko− = bis(2-pyridyl)ketone oximate), have been... more
Abstract Two new mixed-valence iron complexes with 2-pyridyl oximes, [Fe(mpko)3Fe(H2O)2(NO3)](NO3)·2H2O (1) (mpko− = methyl(2-pyridyl)ketone oximate) and [{Fe(dpko)3}2Fe](ClO4)·4H2O (2) (dpko− = bis(2-pyridyl)ketone oximate), have been prepared by reaction of FeIII with mpkoH in methanol (1) and FeII with dpkoH in methanol/water (2). Dinuclear FeII(low-spin)FeIII(high-spin) and trinuclear FeII(low-spin)FeIII(high-spin)FeII(low-spin) cations are present in the crystal structure of 1 and 2, respectively. Intermolecular hydrogen bonds in 1 lead to weak antiferromagnetic interactions between pairs of neighboring FeIII centers, which allows observation of single-ion zero-field splitting effects.
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Materials science is a growing research area in Uruguay. In order to obtain a brief overview of the research done we collected information about research in this field. As a starting point, we searched in the Scopus database for the... more
Materials science is a growing research area in Uruguay. In order to obtain a brief overview of the research done we collected information about research in this field. As a starting point, we searched in the Scopus database for the keywords: affiliation country: “Uruguay” and subject: “Materials Science” (using the “Timbó” platform). We inspected the records and we analyzed them to construct a timeline. The data show that we are in a steady state regime of number of publications that we expect to increase together with the number of students in the area, with the generation of long term policies (grants, funding opportunities), and, if we get involved in a community that promotes this area of interest.
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The syntheses, crystal structures and magnetic properties of four rhenium(IV) compounds of formulae NBu4[ReCl5(pyzCOOH)]·H2O (1), [ReCl5(µ-pyzCOO)M(dmphen)2]·2CH3CN [M = Ni (2) and Co (3)] and {[ReCl5(µ3-pyzCOO)]2Mn2(dmphen)3}n (4) (NBu4... more
The syntheses, crystal structures and magnetic properties of four rhenium(IV) compounds of formulae NBu4[ReCl5(pyzCOOH)]·H2O (1), [ReCl5(µ-pyzCOO)M(dmphen)2]·2CH3CN [M = Ni (2) and Co (3)] and {[ReCl5(µ3-pyzCOO)]2Mn2(dmphen)3}n (4) (NBu4 = tetra-n-butylammonium cation, pyzCOOH = 2-pyrazinecarboxylic acid, dmphen = 2,9-dimethyl-1,10-phenanthroline) are reported herein. Compound 1 was obtained by the reaction of NBu4[ReCl5(dmf)] (dmf = dimethylformamide) with pyzCOOH in acetone, whereas the other complexes were obtained by the reaction of 1 with M(ClO4)2·6H2O [M = Ni (2), Co (3), Mn (4)] and dmphen in acetonitrile. Complex 1 is a mononuclear compound, 2 and 3 are neutral heterodinuclear complexes and 4 is a neutral chain in which each pyzCOO– bridges one ReIV and two MnII in a very unusual µ3-binding mode. Compounds 2 and 3 behave as magnetically isolated species with intramolecular ferromagnetic coupling between ReIV and NiII or ReIV and CoII ions, respectively. In turn, weak antiferromagnetic coupling between the MnII ions through anti-syn-carboxylate bridges together with weak ferromagnetism below 3.1 K due to small spin canting is observed in 4.
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ABSTRACT A novel carboxylate/picolinate oxo-bridged iron(III) cluster, namely [Na2(H2O)8][Fe4(μ-O)2(O2CPh)7(pic)2]2·2H2O (1) where pic = picolinate, has been obtained by reacting “basic iron benzoate” [Fe3O(O2CPh)6(H2O)3](O2CPh) with... more
ABSTRACT A novel carboxylate/picolinate oxo-bridged iron(III) cluster, namely [Na2(H2O)8][Fe4(μ-O)2(O2CPh)7(pic)2]2·2H2O (1) where pic = picolinate, has been obtained by reacting “basic iron benzoate” [Fe3O(O2CPh)6(H2O)3](O2CPh) with sodium picolinate in acetonitrile. The compound has been characterized by elemental analysis and IR spectroscopy and its crystal structure has been determined by single-crystal X-ray diffraction.Variable-temperature magnetic susceptibility measurements in polycrystalline samples reveal moderate antiferromagnetic couplings leading to an S = 0 ground state. Theoretically computed values of the exchange constants in the title compound were also obtained with DFT calculations and were in agreement with the overall conclusions of the analysis of the experimental data.
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Reaction of sodium picolinate with FeIII oxo-centered carboxylate triangles in MeCN in the presence of PPh4Cl yields (PPh4)[Fe4O2(O2CR)7(pic)2] (R=Ph (1), But (2)). Omitting the phosphonium cation produces [Fe8Na4O4(O2CPh)16(pic)4(H2O)4]... more
Reaction of sodium picolinate with FeIII oxo-centered carboxylate triangles in MeCN in the presence of PPh4Cl yields (PPh4)[Fe4O2(O2CR)7(pic)2] (R=Ph (1), But (2)). Omitting the phosphonium cation produces [Fe8Na4O4(O2CPh)16(pic)4(H2O)4] (3), which contains two Fe4Na2 units bridged by two picolinate ligands. X-ray crystal structures of 1 and 3 are reported.Voltammetric profiles in MeCN show four one-electron reduction steps for complexes 1 and 2. Variable-temperature magnetic susceptibility measurements in polycrystalline samples of 1 and 3 reveal strong antiferromagnetic couplings leading to S=0 ground states.
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Research Interests:
Historia de la Química a fines del siglo XIX, a Química se organiza