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Your search keyword '"Sáenz de Pipaón, Cristina"' showing total 16 results
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16 results on '"Sáenz de Pipaón, Cristina"'

1. 9-Cobalt(II)-Containing 27-Tungsto-3-germanate(IV): Synthesis, Structure, Computational Modeling, and Heterogeneous Water Oxidation Catalysis

Author

Haider, Ali, primary, Bassil, Bassem S., additional, Soriano-López, Joaquín, additional, Qasim, Hafiz M., additional, Sáenz de Pipaón, Cristina, additional, Ibrahim, Masooma, additional, Dutta, Daipayan, additional, Koo, Yong-Sun, additional, Carbó, Jorge J., additional, Poblet, Josep M., additional, Galán-Mascarós, José Ramón, additional, and Kortz, Ulrich, additional

Published
2019
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2. Tuning the spin crossover behavior of the polyanion [(H2O)6Fe3(μ-L)6]6–: the case of the cesium salt

Author

Moneo-Corcuera, Andrea, Nieto-Castro, David, Sáenz de Pipaón, Cristina, Gómez, Verónica, Maldonado-Illescas, Pilar, and Galan-Mascaros, Jose Ramon

Abstract

The magnetic behavior of the polyanion [Fe3(μ-L)6(H2O)6]6– (L2– = (1,2,4-triazol-4-yl)ethanedisulfonate) as the corresponding dimethylammonium salt shows memory effect above room temperature, with a dynamic thermal hysteresis cycle over 90 K and temperature-induced excited spin state trapping (TIESST) phenomena at the highest temperatures reported. Taking advantage of the polyanionic nature of this tri- metallic complex, we were able to substitute the dimethylammonium cations by the monovalent heavy alkali metal cesium. This methathesis yielded the salt Cs6[Fe3(μ-L)6(H2O)6], with different molecular packing that increases the number and strength of cation–anion interactions, including a more robust H-bonded network. In this phase, the spin transition still occurs above room temperature, but it is more abrupt and narrow (≈50 K wide hysteresis). Despite these differences, TIESST is observed with almost identical characteristic temperature (TTIESST = 240 K) than in the parent compound, which is an additional experimental evidence supporting the molecular origin of the TIESST behavior in these materials.

Published
2018

3. Conducting Anilate-Based Mixed-Valence Fe(II)Fe(III) Coordination Polymer: Small-Polaron Hopping Model for Oxalate-Type Fe(II)Fe(III) 2D Networks

Author

Sahadevan, Suchithra Ashoka, primary, Abhervé, Alexandre, additional, Monni, Noemi, additional, Sáenz de Pipaón, Cristina, additional, Galán-Mascarós, José Ramón, additional, Waerenborgh, João C., additional, Vieira, Bruno J. C., additional, Auban-Senzier, Pascale, additional, Pillet, Sébastien, additional, Bendeif, El-Eulmi, additional, Alemany, Pere, additional, Canadell, Enric, additional, Mercuri, Maria Laura, additional, and Avarvari, Narcis, additional

Published
2018
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4. Structural Diversity in a New Series of Halogenated Quinolyl Salicylaldimides-Based FeIII Complexes Showing Solid-State Halogen-Bonding/Halogen···Halogen Interactions

Author

Ashoka Sahadevan, Suchithra, primary, Cadoni, Enzo, additional, Monni, Noemi, additional, Sáenz de Pipaón, Cristina, additional, Galan Mascaros, José-Ramon, additional, Abhervé, Alexandre, additional, Avarvari, Narcis, additional, Marchiò, Luciano, additional, Arca, Massimiliano, additional, and Mercuri, Maria Laura, additional

Published
2018
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5. Conducting Anilate-Based Mixed-Valence Fe(II)Fe(III) Coordination Polymer: Small-Polaron Hopping Model for Oxalate-Type Fe(II)Fe(III) 2D Networks

Author

Centre National de la Recherche Scientifique (France), Université d’Angers, Région des Pays de la Loire, Université de Lorraine (France), Regione Autonoma della Sardegna, Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali, Ministerio de Economía y Competitividad (España), Generalitat de Catalunya, Fundação para a Ciência e a Tecnologia (Portugal), Sahadevan, Suchithra Ashoka, Abhervé, Alexandre, Monni, Noemi, Sáenz de Pipaón, Cristina, Galán-Mascarós, José Ramón, Waerenborgh, Joao C., Vieira, Bruno J. C., Auban-Senzier, Pascale, Pillet, Sébastien, Bendeif, El-Eulmi, Alemany, Pere, Canadell, Enric, Mercuri, Maria Laura, Avarvari, Narcis, Centre National de la Recherche Scientifique (France), Université d’Angers, Région des Pays de la Loire, Université de Lorraine (France), Regione Autonoma della Sardegna, Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali, Ministerio de Economía y Competitividad (España), Generalitat de Catalunya, Fundação para a Ciência e a Tecnologia (Portugal), Sahadevan, Suchithra Ashoka, Abhervé, Alexandre, Monni, Noemi, Sáenz de Pipaón, Cristina, Galán-Mascarós, José Ramón, Waerenborgh, Joao C., Vieira, Bruno J. C., Auban-Senzier, Pascale, Pillet, Sébastien, Bendeif, El-Eulmi, Alemany, Pere, Canadell, Enric, Mercuri, Maria Laura, and Avarvari, Narcis

Abstract

The mixed-valence FeIIFeIII 2D coordination polymer formulated as [TAG][FeIIFeIII(ClCNAn)3]·(solvate) 1 (TAG = tris(amino)-guanidinium, ClCNAn2− = chlorocyanoanilate dianionic ligand) crystallized in the polar trigonal space group P3. In the solid-state structure, determined both at 150 and at 10 K, anionic 2D honeycomb layers [FeIIFeIII(ClCNAn)3]− establish in the ab plane, with an intralayer metal−metal distance of 7.860 Å, alternating with cationic layers of TAG. The similar Fe−O distances suggest electron delocalization and an average oxidation state of +2.5 for each Fe center. The cation imposes its C3 symmetry to the structure and engages in intermolecular N−H···Cl hydrogen bonding with the ligand. Magnetic susceptibility characterization indicates magnetic ordering below 4 K and the presence of a hysteresis loop at 2 K with a coercive field of 60 Oe. Mössbauer measurements are in agreement with the existence of Fe(+2.5) ions at RT and statistic charge localization at 10 K. The compound shows semiconducting behavior with the in-plane conductivity of 2 × 10−3 S/cm, 3 orders of magnitude higher than the perpendicular one. A small-polaron hopping model has been applied to a series of oxalate-type FeIIFeIII 2D coordination polymers, providing a clear explanation on the much higher conductivity of the anilate-based systems than the oxalate ones.

Published
2018

9. Tuning the spin crossover behavior of the polyanion [(H2O)6Fe3(μ-L)6]6–: the case of the cesium salt.

Author

Moneo-Corcuera, Andrea, Nieto-Castro, David, Sáenz de Pipaón, Cristina, Gómez, Verónica, Maldonado-Illescas, Pilar, and Galan-Mascaros, Jose Ramon

Subjects
POLYANIONS, CESIUM, HYSTERESIS
Abstract

The magnetic behavior of the polyanion [Fe3(μ-L)6(H2O)6]6– (L2– = (1,2,4-triazol-4-yl)ethanedisulfonate) as the corresponding dimethylammonium salt shows memory effect above room temperature, with a dynamic thermal hysteresis cycle over 90 K and temperature-induced excited spin state trapping (TIESST) phenomena at the highest temperatures reported. Taking advantage of the polyanionic nature of this trimetallic complex, we were able to substitute the dimethylammonium cations by the monovalent heavy alkali metal cesium. This methathesis yielded the salt Cs6[Fe3(μ-L)6(H2O)6], with different molecular packing that increases the number and strength of cation–anion interactions, including a more robust H-bonded network. In this phase, the spin transition still occurs above room temperature, but it is more abrupt and narrow (≈50 K wide hysteresis). Despite these differences, TIESST is observed with almost identical characteristic temperature (TTIESST = 240 K) than in the parent compound, which is an additional experimental evidence supporting the molecular origin of the TIESST behavior in these materials. [ABSTRACT FROM AUTHOR]

Published
2018
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11. Ln12‐Containing 60‐Tungstogermanates: Synthesis, Structure, Luminescence, and Magnetic Studies

Author

Wang, Kai‐Yao, primary, Bassil, Bassem S., additional, Lin, Zhengguo, additional, Römer, Isabella, additional, Vanhaecht, Stef, additional, Parac‐Vogt, Tatjana N., additional, Sáenz de Pipaón, Cristina, additional, Galán‐Mascarós, José Ramón, additional, Fan, Linyuan, additional, Cao, Jie, additional, and Kortz, Ulrich, additional

Published
2015
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15. Ln12-Containing 60-Tungstogermanates: Synthesis, Structure, Luminescence, and Magnetic Studies.

Author

Wang, Kai ‐ Yao, Bassil , Bassem S., Lin, Zhengguo, Römer, Isabella, Vanhaecht, Stef, Parac ‐ Vogt, Tatjana N., Sáenz de Pipaón, Cristina, Galán ‐ Mascarós , José Ramón, Fan, Linyuan, Cao, Jie, and Kortz, Ulrich

Subjects
CHEMICAL synthesis, LUMINESCENCE, PHOTOLUMINESCENCE, TUNGSTEN compounds, RARE earth metals
Abstract

A new class of hexameric Ln12-containing 60-tungstogermanates, [Na(H2O)6⊂Eu12(OH)12(H2O)18Ge2(GeW10O38)6]39− ( Eu12), [Na(H2O)6⊂Gd12(OH)6(H2O)24Ge(GeW10O38)6]37− ( Gd12), and [(H2O)6⊂Dy12(H2O)24(GeW10O38)6]36− ( Dy12), comprising six di-Ln-embedded {β(4,11)-GeW10} subunits was prepared by reaction of [α-GeW9O34]10− with LnIII ions in weakly acidic (pH 5) aqueous medium. Depending on the size of the LnIII ion, the assemblies feature selective capture of two (for Eu12), one (for Gd12), or zero (for Dy12) extra GeIV ions. The selective encapsulation of a cationic sodium hexaaqua complex [Na(H2O)6]+ was observed for Eu12 and Gd12, whereas Dy12 incorporates a neutral, distorted-octahedral (H2O)6 cluster. The three compounds were characterized by single-crystal XRD, ESI-MS, photoluminescence, and magnetic studies. Dy12 was shown to be a single-molecule magnet. [ABSTRACT FROM AUTHOR]

Published
2015
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