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I. A. Charushnikova A. M. Fedoseev Z. A. Starikova 《Russian Journal of Coordination Chemistry》2005,31(8):603-607
The crystal structure of Na3NpO2(OOCCH3)3ClO4 · H2O was studied by single-crystal X-ray diffraction method. The structure is composed of the complex anions NpO2(OOCCH3)3]2−, perchlorate anions, Na cations, and water molecules. The oxygen environment of Np(V) is a hexagonal bipyramid whose equatorial plane is formed by the oxygen atoms of three acetate ions. In addition to the acetate anions, the structure contains the perchlorate ion whose oxygen atoms, except for one, are included in the coordination environment of Na+ cations.__________Translated from Koordinatsionnaya Khimiya, Vol. 31, No. 8, 2005, pp. 636–640.Original Russian Text Copyright © 2005 by Charushnikova, Fedoseev, Starikova. 相似文献
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Markus Dbbelin Garciela Arias Iraida Loinaz Irantzu Llarena David Mecerreyes Sergio Moya 《Macromolecular rapid communications》2008,29(11):871-875
In this communication, polyanionic poly(potassium 3‐sulfopropyl methacrylate) (PSPM) brushes were switched from hydrophilic to hydrophobic by exchange of the counter cations. First, poly(potassium 3‐sulfopropyl methacrylate) brushes were grown by means of atom transfer radical polymerization (ATRP) from thiol monolayers of initiating ω‐mercaptoundecyl bromoisobutyrate and mixed monolayers of thiol initiator and 1‐undecanothiol (blank thiol) attached to gold surfaces. The kinetics of the polymerization reaction were followed by means of the quartz microbalance technique with dissipation (QCM‐D). The collapse of PSPM brushes in the presence of cationic surfactants like quaternary ammonium salts (tetraethylammonium bromide, hexadecyltrimethylammonium bromide) and imidazolium salts (1‐dodecyl‐3‐methylimidazolium bromide, 1H,1H,2H,2H‐perfluoro‐1‐decyl‐3‐methylimidazolium bromide) was shown by QCM‐D. Water contact angle measurements proved that the wettability of the surface could be tuned reversibly from hydrophilic values (<30 °) to hydrophobic ones (>85 °).
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Ibon Odriozola Nerea Ormategui Iraida Loinaz José A. Pomposo Hans J. Grande 《Macromolecular Symposia》2008,266(1):96-100
Summary: Coinage metal salts (e.g. AuIII, AgI and CuII salts) readily react with thiols to give the corresponding metal(I) thiolates. These thiolate species are known to either self-assemble into insoluble polymeric species or to form soluble oligomers, depending on the nature of the thiol ligand. Here we demonstrate that this self-assembling ability can be applied to create supramolecular hydrogels. Glutathione (GSH), a naturally occurring tripeptide, has been used in combination with AuIII, AgI and CuII salts to obtain pH responsive hydrogels that are able to gelate 100 times their weight in water. 相似文献
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Alaitz Ruiz de Luzuriaga Irma Perez-Baena Sarah Montes Iraida Loinaz Ibon Odriozola Ignacio García José A. Pomposo 《Macromolecular Symposia》2010,296(1):303-310
A new route to functional polymeric nanoparticles (PNPs) of different chemical nature in the 3 to 20 nm size range is reported by combining both radical addition fragmentation chain transfer (RAFT) polymerization and “click” chemistry (CC) techniques. RAFT polymerization was employed for the synthesis of well-defined statistical copolymers with pending –Cl groups along the macromolecular chain. After transformation of the –Cl groups to –N3 groups by treatment with sodium azide, an appropriate bifunctional cross-linker is employed to obtain PNPs under CC conditions promoting intramolecular cycloaddition (cross-linking). Following this new route, polystyrene, poly(alkyl (meth)acrylate), polymethacrylic acid, poly(sodium styrenesulfonate) and poly(N-isopropyl) NPs have been synthesized and in-deep characterized. 相似文献
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Edyta Piskorska Krystyna Lawniczak-Jablonska Iraida N. Demchenko Ewa Benko Markku Heinonen 《Mikrochimica acta》2004,145(1-4):159-163
X-ray photoelectron spectroscopy (XPS) is used to estimate phase and element contents of the composites based on cubic boron nitride. A composite is a mixture of several compounds and the use of traditional X-ray diffraction for phase analysis in many cases can be difficult. By using XPS, we were able to evaluate the atomic concentration of elements and the content of different compounds of each element. SEM and XPS showed that samples are heterogeneous. The TiB2 phase, expecting from thermodynamic calculations, was formed in both investigated samples of cBN/Ti3SiC2/TiC but in different amount. The Ti3SiC2 additive was found more chemically active then TiC. 相似文献
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I. A. Charushnikova A. M. Fedoseev A. B. Yusov C. Den Auwer 《Crystallography Reports》2005,50(2):191-193
The crystal structure of a new compound, namely, Nd2TeMo6O24 · 19H2O, is determined using X-ray diffraction. The crystal has a chain structure and consists of [Nd2TeMo6O24 · 14H2O]n neutral chains aligned parallel to the [010] direction and crystallization water molecules. In a chain, each Nd atom links two heteropoly anions. The Nd3+ environment includes seven water molecules and two oxygen atoms of the two heteropoly anions adjacent in the chain. The polyhedron is a monocapped tetragonal antiprism. In the previously studied complex of similar composition, namely, Nd2TeMo6O24 · 18H2O, the Nd coordination polyhedron has the shape of a tricapped trigonal prism formed by six water molecules and three oxygen atoms of the two heteropoly anions adjacent in the chain. 相似文献
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Zadesenets Andrey V. Garkul Ilia A. Filatov Evgeny Yu. Plyusnin Pavel E. Filippov Tikhon N. Asanova Tatyana I. Korolkov Ilya V. Baidina Iraida A. Asanov Igor P. Korenev Sergey V. 《Journal of Thermal Analysis and Calorimetry》2019,135(1):111-121
Journal of Thermal Analysis and Calorimetry - The explanation of abnormal enhancement of transported energy in colloidal nanoparticles in a liquid has sparked much interest in recent years. The... 相似文献
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Andrey Zadesenets Evgeny Filatov Pavel Plyusnin Iraida BaidinaVasiliy Dalezky Yuri Shubin Sergey Korenev Artyom Bogomyakov 《Polyhedron》2011,30(7):1305-1312
All the steps of the proposed technique, from the synthesis of single-source precursors to the preparation of CoPd and CoPt nanoalloys, are described. The double complex salts (DCS) [M(NH3)4][Co(C2O4)2(H2O)2]·2H2O (M = Pd, Pt), which were synthesized by mixing solutions containing [M(NH3)4]2+ cations and [Co(C2O4)2(H2O)2]2− anions, have been used as precursors. The salts obtained were characterized by IR spectroscopy, thermal analysis, XRD and single crystal X-ray diffraction. The prepared compounds crystallize in the monoclinic (space group I2/m, M = Pd) and orthorhombic (space group I222, M = Pt) crystal systems. Thermal decomposition of the salts in helium or hydrogen atmosphere at 200-600 °C results in the formation of nanoalloys powders (random solid solution Co0.50Pd0.50 and chemically ordered CoPt). The size of the bimetallic particles varied from 5 to 20 nm. Order-disorder structural transformations in Co0.50Pt0.50 nanoalloys were studied. The magnetic properties of both chemically disordered Co0.50Pd0.50 and ordered CoPt clusters have also been measured. 相似文献
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Krystyna Ławniczak-Jabłońska Iraida N. Demchenko Edyta Piskorska Andrzej Molak Jakub Kachniarz Markku Heinonen 《Mikrochimica acta》2004,145(1-4):95-99
The (Na1–xBix)(MnyNb1–y)O3 ceramics are new compounds, obtained for the first time, on the base of sodium niobate with substitution of bismuth manganite. It was shown that the solubility limit for Mn ions in sodium niobate lattice does not exceed 1% at. Therefore, the co-doping with Bi ions was proposed to increase this limit. Bismuth ions are expected to replace Na ions and to ensure charge compensation in the formed compound, thus enhancing possibility of accumulation of the Mn ions in solution without losing the appropriate electrical and optical properties. To study the morphology of produced ceramic four methods of sample characterization were used: X-ray photoelectron spectroscopy (XPS), Auger electron spectroscopy (AES), electron microprobe analysis (EPMA) and Scanning Electron Microscopy (SEM). 相似文献