14883-80-8Relevant articles and documents
59Co NMR Spectroscopic Chiral Discrimination of 3+ Enantiomers in Ionic Interacting Systems
Iida, Masayasu,Mizuno, Yuri,Koine, Norio
, p. 1337 - 1344 (1995)
Formation of diastereomers of Δ- and Λ-3+ was investigated in aqueous chiral-electrolyte solutions using 59Co NMR spectroscopy.The chiral electrolytes used were alkali salts for L- and D-tartrates, bis(μ-(-)589-tartrato)diantimonate(III), N-dodecanoyl-L-(and D-)alaninate, N-dodecanoyl-L-threoninate, and N-hexadecanoyl-L-prolinate.The 59Co NMR parameters for the 3+ group were different between the enantiomers in most cases.The NMR parameters used for chiral discrimination were chemical shifts (in simple electrolyte and micellar solutions), ralaxation rates (in simple electrolyte and micellar solutions), peak areas (in micellar solutions), and quadrupole splittings (in liquid crystalline solutions).The larger values of the relaxation rates suggest stronger interactions.On the other hand, the magnitude of the chemical shift change was not simply related to the extent of the interactions.For a chemical shift, the contribution of a geometrical factor seems to be dominant in systems having local anisotropy in the interaction.
Magnetic properties of nanocrystalline é-Fe3N and Co 4N phases synthesized by newer precursor route
Theerthagiri,Dalavi, Shankar B.,Manivel Raja,Panda
, p. 4444 - 4448 (2013)
Nanocrystalline é-Fe3N and Co4N nitride phases are synthesized first time by using tris(1,2-diaminoethane)iron(II) chloride and tris(1,2-diaminoethane)cobalt(III) chloride precursors, respectively. To prepare é-Fe3N and Co4N nitride phases, the synthesized precursors were mixed with urea in 1:12 ratio and heat treated at various temperatures in the range of 450-900 C under the ultrapure nitrogen gas atmosphere. The precursors are confirmed by FT-IR study. The é-Fe 3N phase crystallizes in hexagonal structure with unit cell parameters, a = 4.76 ? and c = 4.41 ?. The Co4N phase crystallizes in face centred cubic (fcc) structure with unit cell parameters, a = 3.55 ?. The estimated crystallite size for é-Fe3N and Co4N phases are 29 nm and 22 nm, respectively. The scanning electron microscopy (SEM) studies confirm the nanocrystalline nature of the materials. The values of saturation magnetization for é-Fe3N and Co 4N phases are found to be 28.1 emu/g and 123.6 emu/g, respectively. The reduction of magnetic moments in ultrafine materials compared to bulk materials have been explained by spin pairing effect, lattice expansion, superparamagnetic behaviour and canted spin structures at the surface of the particles.
Gas-conforming transformability of an ionic single-crystal host consisting of discrete charged components
Takamizawa, Satoshi,Akatsuka, Takamasa,Ueda, Takahiro
, p. 1689 - 1692 (2009/02/06)
(Figure Presented) Dynamic accommodation: The racemic crystal of (±)-[Co(en)3]Cl3 (en = ethylenediamine; see space-filling model of lattice: Co red, N blue, Cl green, C gray) includes H2O molecules within the one-dimensional channels when hydrated. Upon removal of the H2O molecules by vacuum drying, the crystal exhibits dynamic behavior as a host to a variety of light gases or organic vapors within its channels by expansion/contraction of the lattice while single-crystal properties are maintained.
