Adsorption of Cs(I), Sr(II), Eu(III), Co(II) and Cd(II) by Al2O3 was carried out over a wide range of NaCl concentration and solution pH. In the medium pH region (pH 5–9) adsorption depends strongly on pH and less on salt concentration. However, in the high pH region (pH above 9), the salt dependence of the distribution coefficient becomes important.
The preparation, properties and X-ray crystal structure of [Cu(ttda)(tmen)](ClO4)2, a complex of divalent copper perchlorate with the ligands N,N,N′,N′-tetramethyl-1,2-diaminoethane (tmen) and bis-(N,N′-dimethyl-acetamido)thioether(ttda) are reported. The crystals are monoclinic with a = 15.35(1), b = 15.04(1), c = 10.91(1) A, β = 98.74(2)°, four formula units per unit cell and space group P21/n. The complex cation is shown to be penta-coordinate with a distorted square pyramidal geometry. Comparison is made with the properties and structure of the previously reported CuCl2·ttda.
The retention of 82BrO3− in KBrO3 activated with fast nuetrons is about 18% at ambient temperature. Annealing at 523 K gives an increase to 50%. Simultaneously produced 81mSe appears in about 90% as SeO42− at room temperature, which percentage increases to near 100% after annealing. The 76As recoil atoms appear 100% as AsO43−. A description is proposed, based on processes with different spectra of energies of activation. A model is given for these processes, based on the hypothesis that the recoil atom stabilizes in the host lattice in a form which is compatible with, and may be imposed by the crystal structure of the host lattice.
Potentiometric and conductometric titrations of the system Pd(II) and pyridine-2-aldehyde-2′-pyridylhydrazone in aqueous solution show that only one proton per atom of Pd is titratable; i.e. only one mole of ligand coordinates with each Pd. [PdL2] does not form in aqueous solution. Job's method of continuous variations was applied and a computer calculation on a model system was used to estimate equilibrium constants. PMR investigations suggest the ligand in [PdL2] undergoes isomerization about the imine bond.
Mixed pentahaloantimonates(III) formulated as R2(SbX3Y2) (R = substituted ammonium ion and X and YCl, Br or I) and [(C2H5)4N]2 [SbCl3BrI] have been isolated from non-aqueous media by the interaction of the antimony trihalide and the substituted ammonium halide. The reaction stoichiometry between SbX3 (XCl, Br) and substituted ammonium halide was determined by conductimetric titrations. These complexes were characterised by chemical analysis, melting points, conductance, TGA, far IR and electronic spectra.
Cd3[Cr(CN)6]2 · 14H2O crystallizes in a cubic unit cell, space group Fm3m(Oh5, No. 225), with a0 = 10.961(2)Å. The observed density is 1.70(1) Mg-m−3 (calculated density, 1.690 Mg-m−3). A thermogravimetric analysis has yielded 13.9(2) water molecules per formula unit. X-Ray fluorescence emission energy values and infrared spectroscopic results are presented. Full-matrix least-squares refinement of 160 unique reflections has yielded R1 = 0.0350 and R2 = 0.0349. The disordered structure contains molecules in the unit cell. Linkage of the divalent Cd atoms to the Cr atoms is accomplished by cyanide bridging. A new structural model was employed and important bond distances are reported.
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