Leopoldo Suescun

Leopoldo Suescun
Universidad de la República de Uruguay | UdelaR · Facultad de Química

Doctor en Química
Looking for new electrode materials for SOFCs, SOECs and rSOCs to produce and use green Hydrogen.

About

195
Publications
47,530
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1,521
Citations
Citations since 2017
73 Research Items
685 Citations
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2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140
Introduction
“Our goal should be more dramatic than just doing good science — although that’s important and wonderful and good. But we have the potential to do more. We have the potential to walk through darkness and spread light.” E. Bruneau (1973-2020). I specialize in structural analysis by diffraction techniques. I'm currently applying them to the characterization of perovskite oxides for SOFC/SOEC/rSOC systems and MOFs/hybrid materials in collaboration with colleagues from UY, ARG, COL, POL & USA
Additional affiliations
November 2008 - April 2016
Universidad de la República de Uruguay
Position
  • Professor (Associate)
October 2008 - present
Universidad de la República de Uruguay
Position
  • Professor (Associate)
May 2005 - April 2008
Argonne National Laboratory
Position
  • PostDoc Position
Description
  • Postdoc under J.D. Jorgensen and B. Dabrowski Shared position between ANL and Northern Illinois University, Physics Department, DeKalb, IL
Education
September 1999 - December 2003
Universidad de la República de Uruguay
Field of study
  • Chemistry/Crystallography
September 1996 - March 1999
Universidad de la República de Uruguay
Field of study
  • Chemistry/Crystallography

Publications

Publications (195)
Article
In this work we studied the electrochemical performance of Ba0.5Sr0.5Fe0.8Cu0.2O3-δ (BSFCu) as cathode for Intermediate Temperature Solid Oxide Fuel Cells (IT-SOFC) with Ce0.9Gd0.1O1.95 (CGO) electrolyte and the effect of the symmetric cell preparation temperature on the oxygen reduction reaction (ORR) activity. Symmetrical cells with the configura...
Article
The crystal structure of sub-15 nm AMoO4 (A = Ca, Sr, Ba) scheelite nanocrystals has been investigated using a dual-space approach that combines Rietveld and pair distribution function (PDF) analysis of synchrotron X-ray diffraction data. Rietveld analysis yields an average crystal structure in which the Mo-O bond distance exhibits an anomalously l...
Article
Full-text available
The structure of cubic MOF [{Ca(H 2 O) 6 }{CaGd(oxydiacetate) 3 } 2 ] . 4H 2 O. A comparison between structural models obtained from Rietveld refinement of conventional and synchrotron X-ray powder diffraction data and standard refinement of single-crystal X-ray diffraction data The structure of the metal–organic framework (MOF) compound [{Ca(H 2 O...
Article
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A new homologous series of oxygen-vacancy-ordered perovskites with the formula Sr_{4+n}Mn;{3+}_4Mn;{4+}_nO_{10+3n} is proposed based on the structural trends found for the recently described Sr(4)Mn(4)O(10), Sr(5)Mn(5)O(13) and Sr(7)Mn(7)O(19) compounds. These compounds correspond to n = 0 (Sr(4)Mn;{3+}_4O(10)), n = 1 (Sr(5)Mn;{3+}_4Mn(4+)O(13)) an...
Article
The reactivity of alkali-manganese(II) and alkali trifluoroacetates towards amorphous SiO2 (a-SiO2) was studied in the solid-state. K4Mn2(tfa)8, Cs3Mn2(tfa)7(tfaH), KH(tfa)2, and CsH(tfa)2 (tfa = CF3COO-) were thermally decomposed under vacuum in fused quartz tubes. Three new bimetallic fluorotrifluoroacetates of formulas K4Mn3(tfa)9F, Cs4Mn3(tfa)9...
Article
Luminescence is the most exploited phenomena for chemosensing. Real-time measurements must be accurate and reproducible along cycles for the selection of the best sensing materials. At the same time, sample degradation by excitation-light irradiation must be kept minimal. Last but not least, expensive equipment should be avoided, whenever possible....
Article
Full-text available
Single-phase oxygen stoichiometric LaMnO3 and doped La0.8A0.2MnO3 (A = Ca, Sr, Ba) perovskites have been prepared by a simple one-step auto-combustion method. Cation-deficient LaMnO3+δ and La0.8A0.2MnO3+δ were obtained by calcination of the former samples in air at 750 °C. The samples were characterized by X-ray powder diffraction, X-ray photoelect...
Article
YBa2Cu3O6+δ (YBC) oxygen deficient perovskite was synthesized by an auto-combustion method and was studied as potential cathode for Intermediate Temperature Solid Oxide Fuel Cell (IT-SOFC). Synchrotron X-ray thermodiffraction in air shows a phase transition from orthorhombic Pmmm to tetragonal P4/mmm space groups at ~ 425 °C. The chemical compatibi...
Article
An experimental investigation of the structure and crystal-chemistry of the triple perovskite BaSr2MgTa2O9 is reported. Polycrystalline BaSr2MgTa2O9 was synthesized via solid-state reaction and its structure quantitatively probed at 10 and 300 K using neutron diffraction. Monoclinic (A2/m, a⁰ b¯– b–) and trigonal structural models (P3¯c1, a–a–a–) w...
Article
A new synthetic route to access pristine and rare-earth-doped BaFBr nanocrystals is described. Central to this route is an organic-inorganic hybrid precursor of formula Ba5(CF2BrCOO)10(H2O)7 that serves as a dual-halogen source. Thermolysis of this precursor in a mixture of high-boiling point organic solvents yields spherical BaFBr nanocrystals (≈2...
Article
YBa2Cu3O6+δ (YBC) oxygen deficient perovskite was synthesized by an auto-combustion method and was studied as potential cathode for Intermediate Temperature Solid Oxide Fuel Cell (IT-SOFC). Synchrotron X-ray thermodiffraction in air shows a phase transition from orthorhombic Pmmm to tetragonal P4/mmm space groups at ~ 425 °C. The chemical compatibi...
Article
Full-text available
Iboga alkaloids are a group of monoterpenoid indole alkaloids with promising and intriguing biological activities. Ibogaine is the representative member of the series and has become widely known as a potent atypical psychedelic with promising effects to treat substance use disorder. Nowadays, an efficient and scalable enantioselective total synthes...
Article
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The synthesis of eight novel Zn(II), Co(II), Cu(II), Ni(II) and Pt(II) complexes (2–9) derived from the ONNO tetradentate coumarin Schiff-Base donor ligands, L1 and the novel L2, was performed. All compounds were characterized by analytical, spectrometry and spectroscopy techniques. Complexes 2–4 were also characterized by DFT calculations and the...
Article
Treatment of [Ag((CF3)2pz)]3 or [Ag(tBu,C3F7)pz)]3 (pz = pyrazolate) with various stable N-heterocyclic carbenes (NHC) afforded silver(I) complexes containing pyrazolate and NHC ligands in 10-81% crystalline yields. These complexes were analyzed by spectral and analytical techniques and by X-ray crystal structure determinations. The solid state str...
Article
Four novel alkali–manganese(II) trifluoroacetates were synthesized, and their potential as self-fluorinating precursors to layered perovskites A2MnF4 (A = K, Rb, and Cs) was demonstrated. Na2Mn(tfa)4, K4Mn2(tfa)8, Rb4Mn2(tfa)8·0.23H2O, and Cs3Mn2(tfa)7(tfaH) (tfa = CF3COO– and tfaH = CF3COOH) were grown as single crystals, and their crystal structu...
Article
Full-text available
Heteropolynuclear metal organic frameworks (MOFs) of general formula [Ln2Ni3(oda)6(H2O)6]·xH2O (oda = oxydiacetate, Ln = +3 rare earth ion) were synthesized and characterized. Most of them bear a honeycomb structure with 1D channels containing 11 to 14 crystallization water molecules per formula. The size of the channels and the number of crystalli...
Article
Full-text available
[2 x 2] grids of general formula [Ln4L4Cl4(DMF)4].2H2O (Ln = Sm (1), Eu (2), Tb (3); H2L = (E)-N’-((E)-(hydroxyimino)butan-2ylidene)salicylolhidrazide; DMF = dimethylformamide) were successfully constructed using a lanthanide ion as corners and L²⁻, a Schiff base, as linkers. The single crystal X-ray diffraction study reveals that compounds 1 and 3...
Article
Full-text available
RESUMEN El presente estudio está referido a la caracterización de materiales arqueológicos de cuentas y cerámicas, provenientes de los sitios arqueológicos “Iglesia Colonial” y “Pampa La Cruz” de Huanchaco, respectivamente. Las cuentas de “Iglesia Colonial” fueron registradas en contextos funerarios del Período Chimu Inca (1450-1532 d.C.) y Colonia...
Article
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The crystal structure of the title compound, [Ni 3 (C 8 H 4 O 4 ) 3 (C 3 H 7 NO) 4 ], is a two-dimensional coordination network formed by trinuclear linear Ni 3 (tp) 3 (DMF) 4 units (tp = terephthalate = benzene-1,4-dicarboxylate and DMF = dimethylformamide) displaying a characteristic coordination mode of acetate groups in polynuclear metal–organi...
Article
Enantioselective synthesis of ampelomins B, epi-ampelomin B, D and E was accomplished starting from toluene, through a chemoenzymatic sequence, in which a stereoselective hydrogenation, a Mitsunobu reaction, and a regio- and stereoselective nucleophilic opening of an epoxide were used as the main transformations. Structural revision and absolute co...
Preprint
The synthesis of the double perovskite Sr2FeWO6 through the direct combustion technique is reported. A complete characterization of the crystalline structure is performed from Synchrotron X-ray measurements and subsequent Rietveld analysis. The results evidence that this material crystallizes in a monoclinic structure, P21/n space group, with stron...
Article
Full-text available
Lapachol acetate [systematic name: 3-(3-methylbut-2-enyl)-1,4-dioxonaphthalen-2-yl acetate], C 17 H 16 O 4 , was prepared using a modified high-yield procedure and its crystal structure is reported for the first time 80 years after its first synthesis. The full spectroscopic characterization of the molecule is reported. The molecular conformation s...
Article
Full-text available
The structure of the title compound, C 32 H 51 NO 6 , was determined from 62-year-old crystals at room temperature and refined with 100 K data in a monoclinic ( C 2) space group. This compound with a triterpenoid structure, now confirmed by this study, played an important role in the determination of the structure of lanosterol. The molecules pack...
Article
Full-text available
Absolute structure of (3aS,5S,7aS,7bS,9aR,10R,12aR,12bS)-7b-hydroxy-4,4,7a,9a,12a-pentamethyl-10-[(2 R)-6-methylheptan-2-yl]-2,8,9-trioxooctadecahydrobenzo[d ]indeno[4,5-b ]azepin-5-yl acetate from 62-year-old crystals
Article
The design of white-light emitting materials for solid-state lighting technology is governed by the combination of independent red, green and blue emitting centers. Many mixed-lanthanide single phase white-light source materials have been produced so far by a careful trial and error combination of lanthanide ions during the synthetic procedure. In...
Article
La4BaCu5-xMnxO13+δ materials have been synthesized by the sol-gel method in air and studied as possible electrode materials for symmetrical Solid Oxide Fuel Cells (S-SOFC). Within the series, La4BaMn5O13+δ (LBMn) exhibits an excellent stability in reducing atmosphere and remarkable redox stability, although a structure transition from rhombohedral...
Article
Full-text available
Seven cobalt(II) complexes of pyrazole derivatives and dinitrobenzoate ligands were synthesized and characterized. The single-crystal X-ray diffraction structure was determined for one of the ligands and one of the complexes. The analysis and spectral data showed that all the cobalt complexes had octahedral geometries, which was supported by DFT ca...
Article
Searchingforamoreeffectivechemotherapyforthetreatment ofHumanAfricantrypanosomiasis,thediseasecaused by the parasiteTrypanosomabrucei, and cancer, in the current work fivenew [PtII(L)(dppf)](PF6) com-pounds, with HL=8-hydroxyquinoline derivatives and dppf=1,1′-bis(diphenylphosphino)ferrocene, weresynthesizedandfullycharacterized.Crystalstructuresof...
Article
In this work, we report a novel polymorph of AgBiW2O8, which was synthesized by a simple arc melting method. The structural details of this compound were determined by X-ray powder diffraction, and elemental composition was confirmed with ICP-AES. β-AgBiW2O8 adopts the scheelite structure type with tetragonal space group I41/a and lattice parameter...
Article
Full-text available
RESUMEN A pesar de la excepcional arquitectura y policromía del sitio arqueológico de Tambo Colorado, no ha habido trabajos de conservación ni en las estructuras arquitectónicas de tierra cruda, ni en las superficies. Estos trabajos requieren una comprensión adecuada del estado de conservación de la arquitectura del sitio y el análisis de los mater...
Article
The properties of mid-bandgap electronic states are central to the potential application of self-assembled, hybrid organic-inorganic perovskite-like quantum wells in opto-electronic technologies. In this study we investigate broadband light emission from mid-bandgap states in fast-forming hybrid organic lead iodide quantum wells at room temperature...
Article
Three novel bimetallic hybrid crystals featuring rubidium-alkaline-earth metal pairs and trifluoroacetato ligands were synthesized, and their utility as self-fluorinating single-source precursors to the corresponding mixed-metal fluorides was demonstrated. Rb2Mg2(tfa)6(tfaH)2·3H2O, RbCa(tfa)3, and RbSr2(tfa)5 (tfa = CF3COO-; tfaH = CF3COOH) were sy...
Article
Speciosins constitute a group of natural compounds that have never been synthesized enantioselectively. We propose to introduce chirality by the use of enantiopure 3-halo-cis-1,2-cyclohexadienediols of microbial origin. The introduction of...
Article
This manuscript describes the enantioselective synthesis of the aminocyclitol moiety of the antibiotic hygromycin A in eight steps and 39% overall yield from a non‐chiral starting material. The sequence made use of an initial enzymatic step to transfer chirality to an aromatic ring and was followed by selective organic chemistry transformations (ox...
Article
Considering the importance of quinolones due to their broad spectrum of biological activities, the crystal structure of the title compound, C 22 H 21 NO 3 ·0.5C 7 H 16 , has been determined. Two enantiomers of the benzazepinoquinoline molecule and one molecule of heptane form the asymmetric unit of this centrosymmetric triclinic ( P \overline{1}) c...
Article
The crystal structure of divainillin (systematic name: 6,6′-dihydroxy-5,5′-dimethoxy-[1,1′-biphenyl]-3,3′-dicarbaldehyde), C 16 H 14 O 6 , was determined from laboratory powder X-ray diffraction data using the software EXPO2013 (direct methods) and WinPSSP (direct-space approach). Divanillin molecules crystallize in the orthorhombic space group Pba...
Article
New bond valence R0 parameters were derived for alkali– and alkaline-earth–oxygen pairs encountered in metal−organic compounds. A total of 7693 metal−oxygen bond lengths were extracted from structures deposited in the Cambridge Structural Database (CSD) and containing at least one carboxylate ligand bound to the metal. One hundred structures were i...
Article
La4BaCu5−xCoxO13+δ system was successfully synthesized by a modified Pechini route in air. A structural phase transition is observed along the series, from tetragonal ordered structure for 0 ≤ x ≤ 2 to a rhombohedral disordered perovskite for x = 5. A TEC value of 17.3 × 10−6K−1, was found by High-Temperature X-ray Diffraction (HT-XRD) in air for La4...
Article
Full-text available
Using the flexible ligand oxydiacetic acid (H2oda), ten new heteropolynuclear compounds with general formula [Ln2Zn3(oda)6]•xH2O (Ln = lanthanide ion, oda = oxydiacetate) were synthesized and structurally characterized. They were prepared by direct reaction of oda in aqueous solution with stoichiometric amounts of Zn and Ln salts, followed by slow...
Article
Full-text available
An efficient and facile general method for the synthesis of conduritol C analogs, taking advantage of an enantioselective biocatalysis process of monosubstituted benzenes, is described. The absolute stereochemical patterns of the target molecules (−)-conduritol C, (−)-bromo-conduritol C, and (−)-methyl-conduritol C were achieved by means of chemoen...
Article
Oil shales from Mangrullo Formation (Uruguay) was assessed as a potential fuel for energy production. The assessment is based on a comprehensive characterization of the material from a thermal perspective. Co-combustion of this type of fuel with biomass waste can enhance the combustion performance and decrease hazardous gas emissions. The low heati...
Article
Full-text available
The preparation of oxyfluoroborate glasses and glass–ceramics doped with Yb³⁺ and Er³⁺ with improved luminescent properties is reported. Glasses with compositions (100 − x − y) (MO·2B2O3) + xPbF2 + y(YbF3:ErF3) (% in mol), where M is Sr, Ba, Ca, x = 10–40% and y = 0, 1 or 5% were prepared by the melt/quenching technique. Glass crystallization was s...
Article
We describe a novel pericyclic/anionic cascade reaction on tropolonic substrates that combines a Diels-Alder reaction, an oxa-Michael addition, and an acyloin rearrangement to afford tricyclic α-hydroxy-β-methoxyketones. Spectroscopic, crystallographic, and mechanistic studies indicate that the process requires stabilization of reaction intermediat...
Article
Zinc borates are very important industrial materials with applications that include fire retardants and preservatives in wood. In this work, we report the preparation of three novel zinc borates: [Zn(NH3)3B4O5(OH)4]·H2O (ZB1), Zn3(H2B3O7)2·2NH3·4H2O (ZB2), and [Zn(NH3)4][B4O5(OH)4]·4H2O (ZB3). The solid phases were characterized by elemental analys...
Article
The reaction of Cu(CH3COO)2·H2O and Cu(ClO4)2·6H2O with bis(3,5-dimethylpyrazol-1-yl)methane ligand (L) yielded complexes [Cu(CH3COO)2(L)] (1) and [Cu(L)2(H2O)](ClO4)2 (2), which were isolated as air-stable solids. The complexes were characterized by electrical conductivity; thermogravimetric analysis; cyclic voltammetry; and Raman, infrared and ul...
Article
Alkali−manganese(II) trifluoroacetates were synthesized, and their potential as single-source precursors for the solid-state and solution-phase synthesis of AMnF3 fluoroperovskites (A = Na, K, Rb, Cs) was demonstrated. Assembling Na2Mn2(tfa)6(tfaH), K2Mn2(tfa)6(tfaH)2·H2O, Rb2Mn2(tfa)6·H2O, and CsMn(tfa)3 (tfa = trifluoroacetate) was facilitated by...
Article
Full-text available
The cover picture shows amaryllidaceae alkaloids, which are well-known because of their toxicity and potential medical use. Among them, the narciclasine group and particularly fully oxygenated pancratistatin are promising anticancer agents but the complexity of the molecular structure undermines the development of drugs. Efficient synthetic approac...
Article
The reaction of CrCl36H2O with the ligand bis(3,5-dimethylpyrazol-1-yl)methane (L) yielded the cationic complex [(Cr(L)(H2O)2Cl2]⁺, which crystallized as the chloride trihydrate [(Cr(L)(H2O)2Cl2]Cl·3H2O. The chromium complex was characterized by elemental analysis, electrical conductivity, Infrared and Ultraviolet/Visible spectroscopy. The crystal...
Article
Full-text available
Four tricyclic lactams that structurally resemble alkaloids with the pancratistatin skeleton were synthetized from bromobenzene by a chemoenzymatic strategy. The sequence involved enzymatic dihydroxylation, efficient stereodirected oxidation of double bonds, inter- or intramolecular Hüisgen cycloaddition and a solvent free cyclization. The complex...
Article
The enantioselective preparation of three protected β-amino- γ -hydroxyesters from benzoic acid is described. The employed synthetic methodology involves the ipso, ortho cis-dihydroxylation of benzoic acid by the mutant strain Ralstonia eutropha B9, followed by a selective halonium induced beta lactamization. Modification of this novel β-lactam str...
Article
Full-text available
The molecule of the title keto carbasugar, C7H10O4, is formed by a cyclohexene skeleton with an envelope conformation, substituted by carbonyl, methyl and hydroxyl groups. The crystal structure is controlled mainly by a combination of strong O—H...O and weak C—H...O hydrogen bonds, forming nearly perpendicular chains running parallel to the [110] a...
Article
Gabosines constitute a group of naturally occurring compounds with unique structures that exhibit very interesting biological activities. Synthetic efforts have been continuously reported since 1985. In this work, multistep total syntheses of natural gabosine H and non-natural gabosines have been accomplished by using a chemoenzymatic approach. Chi...
Article
Full-text available
The synthesis of new oxazolidinylthiazolidines bicycles, oxygen analogues of bisthiazolidines, also known as metallo-β-lactamase inhibitors is described. The reaction of β-aminoalcohols and 2,5-dihydroxy-1,4-dithiane led to oxazolidinylthiazolidines and/or dithioazabicycles as the main products. The distribution pattern depends mainly on the aminoa...
Article
A concise and stereoselective de novo synthesis of the protected oxidized sugar (5R)-3,4:5,6-di-O-isopropylidene-d-ribo-hexos-5-ulo-5,2-furanose is described. The synthetic sequence involves a stereoselective proline-catalyzed aldol reaction of an orthogonally protected l-glyceraldehyde derivative and 2,2-dimethyl-1,3-dioxan-5-one, to obtain 5-O-ac...
Article
Owing to their potential as single-source precursors for compositionally complex materials, there is growing interest in the rational design of multimetallic compounds containing fluorinated ligands. In this work, we show that chemical and structural principles for a materials-by-design approach to bimetallic trifluoroacetates can be established th...
Article
Full-text available
The absolute configuration, i.e. (3a R ,3′a R ,7a S ,7′a S ), of the title compound, C 18 H 26 O 4 , synthesized via a palladium-catalyzed homocoupling reaction, was determined on the basis of the synthetic pathway and was confirmed by X-ray diffraction. The homocoupled molecule is formed by two chemically identical moieties built up from two five-...