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31 citations found for Falvello, R.
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The analysis of a hydrophobic–hydrophilic ion-pair structure at two temperatures permits the comparative evaluation of the accurate geometric results obtained at low temperature and less accurate results at room temperature using a knowledge-based approach.
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Repeated cycling through a reversible order–disorder phase transition in a crystal of a cobalt orotate complex produces an arrested transformation, leaving the sample with both triclinic and monoclinic domains. Independent determinations of the two structures were carried out from single-phase samples and the partial transition permitted simultaneous structure determination of the two phases at a temperature at which one of them is not expected to exist independently.
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research papers (metal-organic compounds)
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metal-organic compounds
CHEMISTRY | CRYSTENG
Commentary is given on a paper [Butler et al. (2022). IUCrJ, 9, 364–369] reporting the crystallization of two room-temperature liquids, water and 2,2,6,6-tetramethylpiperidine, to form a crystalline solid with a water-lined channel potentially capable of proton transport.
editorial
metal-organic compounds
In hexaaquanickel bis(2,6-dioxo-1,2,3,6-tetrahydropyrimidine-4-carboxylate) dihydrate, [Ni(H2O)6](C5H3N2O4)2·2H2O, the nickel cation is coordinated by six aqua ligands and only associated with the two orotate ions through hydrogen bonds. The structure is isotypic with the magnesium and zinc analogues. The metal cation sits on a crystallographic center of inversion that relates the water molecules and the organic anions. The orotate moieties form an unbonded one-dimensional chain mediated by a hydrogen-bonded self-recognition interaction. The hexaaquanickel complex molecules bridge these chains laterally, acting as molecular clamps that bring neighboring layers nearer than expected. As a result of this three-dimensional arrangement, a short contact of 3.166 (5) Å is observed between two C atoms of two adjacent ribbons.
metal-organic compounds
metal-organic compounds
The structure of the title complex, poly[dicaesium(I) hexaaquacobalt(II) [octaaquatetra-μ-citrato-hexacobalt(II)] dodecahydrate], {Cs2[Co(H2O)6][Co6(C6H4O7)4(H2O)8]·12H2O}n, at 100 (1) K is formed by layers of a square two-dimensional polymer composed of CoII citrate cubanes bridged by magnetically active six-coordinate CoII cations. The polymer has plane symmetry p4mm in the c-axis projection. The cubanes reside on sites of crystallographic symmetry 
, while the bridging CoII centres lie on twofold axes. The basic polymeric unit has a charge of 4−, balanced by two Cs+ and a [Co(H2O)6]2+ (symmetry ) cation, which lie in channels between the polymeric layers. Unligated water molecules, of which there are 12 per cubane, enter into an extended intralayer and layer-bridging hydrogen-bond pattern, which can be described in detail even though not all of the H atoms of the water molecules were located.
, while the bridging CoII centres lie on twofold axes. The basic polymeric unit has a charge of 4−, balanced by two Cs+ and a [Co(H2O)6]2+ (symmetry ) cation, which lie in channels between the polymeric layers. Unligated water molecules, of which there are 12 per cubane, enter into an extended intralayer and layer-bridging hydrogen-bond pattern, which can be described in detail even though not all of the H atoms of the water molecules were located.metal-organic compounds
scientific commentaries
Single-crystal diffraction studies yield information on the complex motions involved in phase transitions in molecular crystals. There is reason to believe that extensive potential exists for further discovery in this field.
metal-organic compounds
In the title compound, [ZnCl2(C3H6N2O)2], the zinc(II) cation is surrounded by a distorted tetrahedral environment consisting of two Cl anions and two imidazolidin-2-one molecules, the latter bound to the metal through their carbonyl O atoms. All atoms that are able to participate in hydrogen bonding are involved in such interactions. A hydrogen-bonding network mediates the formation of molecular columns parallel to the a axis. Neighboring columns are not bound by significant non-covalent interactions; the result is an extended pattern of supramolecular aggregation that is intermediate in completeness between the situations observed in two related complexes of cobalt that have been studied previously.
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research papers (inorganic compounds)
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