Search results for "Iodate"
showing 10 items of 34 documents
CCDC 2041023: Experimental Crystal Structure Determination
2021
Related Article: Goulielmina Anyfanti, Antonio Bauzá, Lorenzo Gentiluomo, João Rodrigues, Gustavo Portalone, Antonio Frontera, Kari Rissanen, Rakesh Puttreddy|2021|Frontiers in Chemistry|9||doi:10.3389/fchem.2021.623595
CCDC 2068108: Experimental Crystal Structure Determination
2021
Related Article: Shilin Yu, Jas S. Ward, Khai-Nghi Truong, Kari Rissanen|2021|Angew.Chem.,Int.Ed.|60|20739|doi:10.1002/anie.202108126
CCDC 2068107: Experimental Crystal Structure Determination
2021
Related Article: Shilin Yu, Jas S. Ward, Khai-Nghi Truong, Kari Rissanen|2021|Angew.Chem.,Int.Ed.|60|20739|doi:10.1002/anie.202108126
CCDC 1514740: Experimental Crystal Structure Determination
2016
Related Article: Sandra Kaabel, Jasper Adamson, Filip Topić, Anniina Kiesilä, Elina Kalenius, Mario Öeren, Mart Reimund, Elena Prigorchenko, Aivar Lõokene, Hans J. Reich, Kari Rissanen, Riina Aav|2017|Chemical Science|8|2184|doi:10.1039/C6SC05058A
Low-Frequency Relaxation Phenomena in α-LiIO3: The Nature and Role of Defects
2002
The lithium iodate ionic conduction in the polar c-axis direction is studied between 35 and 470 K for crystals grown in various conditions. So far, to separate processes induced by the nature of electrodes, the impedance spectroscopy technique had been used at room temperature with both metallic and ideally polarizable insulating electrodes, so that a relaxation of space charges was clearly identified. Here, the temperature dependence of the hopping ionic conductivity exhibits quite different activation energies well related to the growth conditions. Following low-temperature Raman and thermodynamic experiments, a new approach based on a vacancy diffusion mechanism is proposed. Experimental…
Etude par analyse thermique différentielle des tranformations de phases sur l'iodate de lithium
1986
International audience; Lithium iodate (LiIO3) exists at room temperature either as hexagonal (alpha) or tetragonal (beta) crystals. Beta-LiIO3 is stable up to the melting point, whereas alpha-LiIO3 is known to undergo phase transitions. We have studied by differential thermal analysis (DTA) the sequence of phase transitions occurring on powders prepared by different processes. An alpha-LiIO3 powder obtained by grinding a single crystal exhibits the well-known transformations alpha-gamma-beta. A powder obtained by fast evaporation of an aqueous solution transforms directly the alpha to the beta and does not exhibit any intermediate gamma phase. Further, DTA investigations point out that the…
Yodatos bajo condiciones extremas: Transiciones de fase inducidas por la presión, propiedades estructurales, vibracionales y electrónicas
2022
La estructura cristalina de los yodatos metálicos juega un papel importante en la respuesta SHG, así como también lo hacen la estructura de bandas electrónica y la energía de bandgap de la misma. Por ello, en esta tesis doctoral se estudia en profundidad y se presentan y analizan resultados de la estructura cristalina a alta presión, las vibraciones atómicas y la estructura de bandas electrónica de cuatro yodatos metálicos. Estos son el yodato de hierro, Fe(IO3)3, el yodato de cobalto, Co(IO3)2, el yodato de zinc, Zn(IO3)2, y yodato de magnesio Mg(IO3)2. Estos materiales han sido estudiados por medio de difracción de rayos X a alta presión (HPXRD), dispersión Raman a alta presión (HPRS), es…
The “green” electrochemical synthesis of periodate
2020
Abstract High‐grade periodate is relatively expensive, but is required for many sensitive applications such as the synthesis of active pharmaceutical ingredients. These high costs originate from using lead dioxide anodes in contemporary electrochemical methods and from expensive starting materials. A direct and cost‐efficient electrochemical synthesis of periodate from iodide, which is less costly and relies on a readily available starting material, is reported. The oxidation is conducted at boron‐doped diamond anodes, which are durable, metal‐free, and nontoxic. The avoidance of lead dioxide ultimately lowers the cost of purification and quality assurance. The electrolytic process was opti…
Stabilization of anti-leukemic enzyme l-asparaginase by immobilization on polysaccharide levan
2001
Abstract Biologically active fructose polymer levan from Zymomonas mobilis of different molecular mass (75 and 2000 kDa) was covalently coupled to anti-leukemic enzyme Erwinia carotovora l -asparaginase. The method used for the immobilization of the enzyme involved periodate oxidation of the polysaccharide, followed by reductive alkylation. A gentle periodate oxidation of levan (oxidation degree ≤24%) resulted in the highest residual enzyme activity (≥55%). The K m(app.) of glycoconjugates was higher than the K m of native l -asparaginase. The conjugation of l -asparaginase widened the optimum pH range of the enzyme. The electrophoretic mobility in polyacrylamide gel of glycoconjugates obta…
Iodine speciation in rain, snow and aerosols
2008
Iodine oxides, such as iodate, should be the only thermodynamically stable sink species for iodine in the troposphere. However, field observations have increasingly found very little iodate and significant amounts of iodide and soluble organically bound iodine (SOI) in precipitation and aerosols. The aim of this study was to investigate iodine speciation, including the organic fraction, in rain, snow, and aerosols in an attempt to further clarify aqueous phase iodine chemistry. Diurnal aerosol samples were taken with a 5 stage cascade impactor and a virtual impactor (PM<sub>2.5</sub>) from the Mace Head research station, Ireland, during summer 2006. Rain was collected from Austr…