4 edition of Magnetic interactions in oxo-carboxylate bridged gadolinium (III) complexes found in the catalog.
Magnetic interactions in oxo-carboxylate bridged gadolinium (III) complexes
|Statement||Laura Cañadillas-Delgado ... [et al.].|
|LC Classifications||QD181.G4 M34 2010|
|The Physical Object|
|LC Control Number||2010029771|
The gadolinium atom is nine-coordinate with three water molecules and six malonate oxygen atoms from three malonate ligands forming a distorted monocapped square antiprism. The shortest metal-metal separations are (3) A [through the oxo-carboxylate bridge] and (3) A [through the carboxylate in the anti-syn coordination mode]. The Gd(iii) coordination polymer [Gd(mes)(H2O)6]n (1), where H3mes stands for trimesic acid, was subjected to variable temperature/field magnetizations and heat capacity measurements. Analyses of the magnetic data revealed negligible magnetic interactions (zJ = − cm−1) and the isothermal magnetic entropy change.
Three new gadolinium(III) complexes with carboxylate ligands of formula [Gd2(ac)6(H2O)4]2H2O (1), [Gd2(ac)2(fum)2(H2O)4]n (2) and [Gd2(ox)(fum)2(H2O)4]n4nH2O (3) (ac = acetate, fum = fumarate and ox = oxalate) have been prepared and their structures determined by X-ray diffraction on single crystals. The s Crystal engineering in molecular magnetismCited by: gadolinium: compounds, production and applications ; library of congress cataloging-in-publication data ; contents ; preface ; magnetic interactions in oxo-carboxylate bridged gadolinium(iii) complexes: synthesis, crystal structures and magnetic properties ; abstract ; introduction ; magnetic aspects ; gadolinium(iii): magnetic properties.
Pairs of Gd atoms with a double oxo-carboxylate bridge occur in both phases, and the main differences between both structures deal with the Gd environment and the H-bond pattern. 3 is also a three-dimensional compound, and it was obtained by reacting Gd(III) ions with malonic acid in Cited by: The structures of have in common the double oxo-carboxylate bridge between gadolinium(III) ions (μ-O: κ2O,O′) either as a discrete units (1 and 2) or as a chain (3) and one (3) or two (2) syn-syn carboxylate bridges that reinforce this bridging pathway in 2 and 3.
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: Magnetic Interactions in Oxo-carboxylate Bridged Gadolinium III Complexes (Chemistry Research and Applications) (): Canadillas-delgado, Laura, Fabelo, Oscar, Ruiz-perez, Catalina, Cano, Joan: BooksFormat: Paperback. The interpretation of these results in the case of dinuclear gadolinium(III) compounds with a di-μ-oxo(carboxylate) bridge, has allowed to establish a relationship between the nature of the.
A spin density functional (SDFT) study of carboxylate-bridged and diazenido-bridged dinuclear gadolinium compounds is presented. Calculated magnetic coupling constants for the carboxylate-bridged structures are in good agreement with experimental data, confirming the ability of the broken symmetry approach used in this work to predict magnetic behavior in such by: The structures of 1–3 have in common the double oxo-carboxylate bridge between gadolinium(III) ions (μ-O:κ 2 O,O′) either as a discrete units (1 and 2) or as a chain (3) and one (3) or two (2) syn–syn carboxylate bridges that reinforce this bridging pathway in 2 and by: This book presents a systematic study of complex formation between gadolinium(III) and carboxylate-containing ligands which investigates the factors that govern the magnetic coupling.
This suggests that magnetic interactions between the Gd(III) cations in the dimers may be operative. However, the complexity of the system does not allow further conclusions to be reached.
In summary, the main result of the present work is to afford structural data for new gadolinium (III) dimers bridged by carboxylate by: By modeling the magnetic behavior of the Gd compound with a dinuclear Hamiltonian ℋ S = gμ B (S A + S B)B o − J o S A S B (S A = S B = 7/2), a ferromagnetic exchange interaction J o = cm-1 was evaluated between Gd ions situated at d o = Å in dinuclear units bridged by two symmetry-related tridentate carboxylate oxygens.
The. The present paper is devoted to the study of original trinuclear (CuII, LnIII, CuII) complexes (Ln = La, Ce, Gd). They derive from the polydentate ligands H2Li (i = 1, 3, 4) represented in Figure 1. The crystal and molecular structures of two complexes have been determined at room temperature.
The (Cu, Gd, Cu) complex of H2L1 1Gd and the (Cu, Ce, Cu) complex of H2L3 3Ce crystallize in the Cited by: Two- and Three-Dimensional Networks of Gadolinium(III) with Dicarboxylate Ligands: Synthesis, Crystal Structure, and Magnetic Properties.
Magnetic Interactions in Oxo-Carboxylate Bridged Gadolinium (III) Complexes: Synthesis, Crystal Structures and Magnetic Properties Application of the Gadolinium Foils as Converters of Thermal Neutrons in Detectors of Nuclear Radiation.
The compounds contain isostructural chains built by Ln nodes bridged by carboxylate groups and connected by H bonds. A ferromagnetic exchange interaction Jo = cm -1 between Gd (III). Synthesis, Crystal Structure, and Magnetic Behaviour of Gd(CF2HCOO)3(phen)Single crystals of Gd(CF2HCOO)3(phen) have been obtained by reaction of Gd(CF2HCOO)3(H2O)2H2O with 1,10–phenanthroline.
comprehensive understanding of the static critical magnetic behavior of gadolinium. EXPERIMENTAL METHODS AND DATA ANALYSIS A single crystal of high purity gadolinium with a resis- tivity ratio of p( Wp( K) = was cut into the form of a cube with an edge length t cm and the.
Magnetic interactions in oxo-carboxylate bridged gadolinium (III) complexes by Laura Cañadillas-Delgado; Analytical chemistry of uranium: environmental, forensic, nuclear, and toxicological applications by Zeev Karpas. Compound 1 is a dimer structure made up of double μ 1,5 -dca-bridged gadolinium (III) ions and one terminal dca ligand; variable-temperature magnetic susceptibility measurements reveal the occurrence of a significant ferromagnetic interaction directly spin polarization through the NITpPy–Gd (III)–NITpPy pathway with J = cm − by: 4.
The magnetic properties of the distorted perovskite GdCrO 3 have been investigated by magnetic moment measurements in the temperature range below K and specific heat measurements below 10K. Measurements show that the canting of the Cr 3+ ions from a simple antiferromagnetic alignment is due to antisymmetric exchange coupling between Cr ions.
The value of the weak ferromagnetic Cited by: Magnetic Interactions In Oxo-carboxylate Bridged Gadolinium Iii Complexes, Pa $ Magnetic Interactions.
Magnetic Interactions In Oxo-carboxylate Bridged Gadolinium Iii Complexes, Pa $ Gadoliniumiii Nitrate. Gadoliniumiii Nitrate Hexahydrate, Gdno33 • 6h2o - Cas Materials Chemistry and Physics, 31 () 17 Magnetic interactions involving rare earth ions Cristiano Benelli, Andrea Caneschi, Dante Gatteschi and Luca Pardi Department of Chemistry, University of Florence, Florence (Italy) Abstract The bulk properties of magnetic materials containing rare earths are essentially determined by the anisotropy of the ground state of 4f ions and by the Cited by: W.
Florek, M. Antkowiak and G. Kamieniarz, The Kahn degenerate frustration points and the Lieb-Mattis level order in heterometallic wheel molecules with competing interactions, Journal of Magnetism and Magnetic Materials, /, (), ().Cited by: The magnetic properties research reveal that compounds 1–4 show cryogenic magnetic refrigeration properties with −ΔS Max values of J kg −1 K −1 for 1, J kg −1 K −1 for 2, J kg −1 K −1 for 3 and J kg −1 K −1 for 4.
Download: Download high Cited by: 1. The effect of magnetic coupling on magneto-caloric behaviour in two 3D Gd with very weak interactions as indicated by the Curie–Weiss fit C.
Ruiz-Pérez and J. Cano, Magnetic Interactions in Oxo-Carboxylate Bridged Gadolinium(III) Complexes, Nova publishing, Spain, Cited by: The novel gadolinium(III) containing compounds (CH 3 NH 3) 2 [Gd 2 (CCl 3 COO) 6 (H 2 O) 6](CCl 3 COO) 2 2CCl 3 COOH (1) and (NH 3 CH 3) 2 [Gd 4 (OH) 4 (CCl 3 COO) 10 (H 2 O) 6]2H 2 O (2) were synthesized and structurally characterized by X-ray the crystal structure of 1 the gadolinium ions are bridged by carboxylate groups to dimers with a Gd 3+ –Gd 3+ distance of Cited by: Complexes of the element gadolinium (Gd) are the most widely used of all MR contrast agents.
Because of its unique electronic structure (described below), Gd is strongly paramagnetic. Paramagnetism is an intrinsic property of certain materials to become temporarily magnetized when placed in an external magnetic fact, Gd is one of only four elements that can be magnetized at room.