Papers by Amaia Iturrospe
Angewandte Chemie, Jun 30, 2023
The 3D hybrid framework [{Cu(cyclam)}3(κ‐Mo8O27)] ⋅ 14H2O (1) (cyclam=1,4,8,11‐tetraazacyclotetra... more The 3D hybrid framework [{Cu(cyclam)}3(κ‐Mo8O27)] ⋅ 14H2O (1) (cyclam=1,4,8,11‐tetraazacyclotetradecane) undergoes sequential single‐crystal‐to‐single‐crystal transformations upon heating to afford two different anhydrous phases (2 a and 3 a). These transitions modify the framework dimensionality and enable the isomerization of κ‐octamolybdate (κ‐Mo8) anions into λ (2 a) and μ (3 a) forms through metal migration. Hydration of 3 a involves condensation of one water molecule to the cluster to afford the γ‐Mo8 isomer in 4, which dehydrates back into 3 a through the 6 a intermediate. In contrast, 2 a reversibly hydrates to form 5, exhibiting the same Mo8 cluster as that of 1. It is remarkable that three of the Mo8 clusters (κ, λ and μ) are new and that up to three different microporous phases can be isolated from 1 (2 a, 3 a, and 6 a). Water vapor sorption analyses show high recyclability and the highest uptake values for POM‐based systems. The isotherms display an abrupt step at low humidity level desirable for humidity control devices or water harvesting in drylands.
Nanomaterials, Apr 18, 2023
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Applied Clay Science, Oct 1, 2023
Angewandte Chemie
The 3D hybrid framework [{Cu(cyclam)}3(κ‐Mo8O27)] ⋅ 14H2O (1) (cyclam=1,4,8,11‐tetraazacyclotetra... more The 3D hybrid framework [{Cu(cyclam)}3(κ‐Mo8O27)] ⋅ 14H2O (1) (cyclam=1,4,8,11‐tetraazacyclotetradecane) undergoes sequential single‐crystal‐to‐single‐crystal transformations upon heating to afford two different anhydrous phases (2 a and 3 a). These transitions modify the framework dimensionality and enable the isomerization of κ‐octamolybdate (κ‐Mo8) anions into λ (2 a) and μ (3 a) forms through metal migration. Hydration of 3 a involves condensation of one water molecule to the cluster to afford the γ‐Mo8 isomer in 4, which dehydrates back into 3 a through the 6 a intermediate. In contrast, 2 a reversibly hydrates to form 5, exhibiting the same Mo8 cluster as that of 1. It is remarkable that three of the Mo8 clusters (κ, λ and μ) are new and that up to three different microporous phases can be isolated from 1 (2 a, 3 a, and 6 a). Water vapor sorption analyses show high recyclability and the highest uptake values for POM‐based systems. The isotherms display an abrupt step at low hu...
Nanomaterials, Apr 18, 2023
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Soft Matter, 2021
A magnetorheological fluid with good properties (yield stress and reversibility), containing high... more A magnetorheological fluid with good properties (yield stress and reversibility), containing high magnetization FeCo nanoparticles as magnetic fillers is presented.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... 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 cr... 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 cr... 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 cr... 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 cr... 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.
trans-Diaquabis(pyridazine-3-carboxyl-ato-j2N2,O)copper(II)
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... 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 cr... 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 cr... 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.
Three new hybrid inorganic-metalorganic compounds containing Keggin-type polyoxometalates, neutra... more Three new hybrid inorganic-metalorganic compounds containing Keggin-type polyoxometalates, neutral copper(II)-picolinate complexes and guanidinium cations have been synthesized in bench conditions and characterized by elemental analysis, infrared spectroscopy and single-crystal X-ray diffraction: the isostructural [C(NH2)3]4[{XW12O40}{Cu2(pic)4}]•[Cu2(pic)4(H2O)]2•6H2O [X = Si (1), Ge (3)] and [C(NH2)3]8[{SiW12O40}2{Cu(pic)2}3{Cu2(pic)4(H2O)}2]•8H2O (2). The three compounds show a pronounced two-dimensional character owing to the structure-directing role of guanidinium. In 1 and 3, layers of [{XW12O40}{Cu2(pic)4}]n 4n− hybrid POM chains and layers of [Cu2(pic)4(H2O)] complexes and [C(NH2)3] + cations pack alternately along the z axis. The hydrogen-bonding network established by guanidinium leads to a trihexagonal tiling arrangement of all copper(II)-picolinate species. In contrast, layers of [C(NH2)3] +-linked [{SiW12O40}2{Cu(pic)2}3]n 8n− double chains where each Keggin cluster displays a {Cu2(pic)4(H2O)} moiety pointing at the intralamellar space are observed in 2.
Crystal Growth & Design, 2020
Hydrothermal reaction between the monolacunary polyoxometalate [SiW11O39] 8-, a copper(II) salt a... more Hydrothermal reaction between the monolacunary polyoxometalate [SiW11O39] 8-, a copper(II) salt and 1,4,8,11tetraazacyclotetradecane (cyclam) affords the first example of a hybrid compound combining metal complexes of such N4tetradentate macrocyclic ligand and Keggin-type clusters, namely [Cu(cyclam)(H2O)][{Cu(cyclam)}2SiW11O39Cu(H2O)]•5H2O (1). This compound has been characterized by infrared spectroscopy, thermal and elemental analyses. Single-crystal X-ray diffraction (scXRD) reveals a layered crystal packing made of corrugated 2-dimensional covalent grids in which four octahedral {Cu(cyclam)} 2+ bridging moieties connect copper(II)-monosubstituted {SiW11O39Cu(H2O)} 6polyanions to four adjacent clusters, and additional [Cu(cyclam)(H2O)] 2+ square-pyramidal counterions are embedded into square-like grid voids. Thermo-structural analyses confirms the presence in the 130-250 °C temperature range of a stable and crystalline anhydrous phase, which displays a diffraction pattern different from that of 1. This thermally-triggered phase transition proceeds through a single-crystal to singlecrystal transformation pathway, which according to scXRD, involves not only the release of water molecules, but also the cleavage and formation of Cu-O bonds induced by the rotation of Keggin-type anions. These modifications fully dismantle the parent 2-dimensional covalent assembly to result in the neutral, discrete [{Cu(cyclam)}3SiW11O39Cu] hybrid species (2), in which the cluster exhibits three square-pyramidal {Cu(cyclam)} 2+ decorating moieties grafted at its surface. This species must display a 5coordinated copper(II) center in the Keggin skeleton, and therefore, it constitutes one of the scarce examples of such type of coordinatively unsaturated substituted cluster observed in the solid state. The irreversibility of the phase transition has been confirmed by combined thermal and diffractometric analyses, which evidenced also the great flexibility of the supramolecular framework of 2, as this anhydrous phase is able to adsorb up to six water molecules per cluster to lead to the hydrated derivative [{Cu(cyclam)}3SiW11O39Cu(H2O)]•5H2O (2h) without any significant alteration in its cell parameters, nor in its crystalline structure.
Uploads
Papers by Amaia Iturrospe