Showing papers by "Hitoshi Ohtaki published in 1979"

X-ray diffraction studies on the structures of diammine- and aquasilver(I) complexes in aqueous solution.

Abstract: X-Ray diffraction studies were carried out for aqueous diamminesilver(I) nitrate, silver(I) perchlorate and nitrate solutions. The radial distribution curve of the diamminesilver(I) nitrate solution showed that the length of the Ag–NH3 bond is (2.22±0.02) A. In the aqueous silver(I) perchlorate solution, a silver(I) ion is combined with two water molecules at a distance of (2.41±0.02) A, the result being in good agreement with that obtained for the nitrate solution.

X-Ray Diffraction Studies on the Structures of Tetra- and Higherammine Complexes of Copper(II) Ion in Aqueous Solution

Abstract: From X-ray scattering measurements on ammoniacal aqueous solutions of copper(II) chloride at the NH3/Cu mole ratios of 4.8 and 5.0, four ammonia molecules at the equatorial position and other two water molecules at the axial one were found to be coordinated to a copper(II) ion at the distance of 2.03 and 2.33 A, respectively. The radial distribution curve obtained for an aqueous solution of copper(II) chloride saturated with ammonia (NH3/Cu=11.2) showed that a higher ammine copper(II) complex than the tetraamminecopper(II) ion is formed in the solution. The complex has a distorted octahedral form in which the equatorial Cu–N bond distance is 1.93 A. The axial apices of the octahedron at the distance of 2.30 A are occupied by either an ammonia molecule and a water molecule or two ammonia molecules. The present study shows that the structures of the tetra- and higher-ammine copper(II) complexes in solution are different from those in crystal.

An X-Ray Diffraction Study on the Structure of Hexa-amminecadmium(II) Ion in Aqueous Solution

Abstract: The structure of the hexaamminecadmium(II) ion in an ammoniacal aqueous solution of cadmium chloride was determined by the X-ray diffraction method at the NH3/Cd mole ratio of 9.9. The result showed that a cadmium(II) ion is octahedrally surrounded by six ammonia molecules at the distance of (2.37±0.03) A.

X-ray diffraction studies on the structures of diammine- and aquasilver(i) complexes in aqueous solution

Abstract: X-Ray diffraction studies were carried out for aqueous diamminesilver(I) nitrate, silver(I) perchlorate and nitrate solutions. The radial distribution curve of the diamminesilver(I) nitrate solution showed that the length of the Ag–NH3 bond is (2.22±0.02) A. In the aqueous silver(I) perchlorate solution, a silver(I) ion is combined with two water molecules at a distance of (2.41±0.02) A, the result being in good agreement with that obtained for the nitrate solution.

X-ray diffraction studies on the structures of tetraammine- and triamminemonochlorozinc(ii) ions in aqueous solution

Abstract: X-Ray scattering measurements have been carried out on ammoniacal aqueous solutions of zinc(II) chloride at the NH3/Zn mole ratios of 3.8, 5.0, and 6.6. The radial distribution curves show that the tetraamminezinc(II) complex is formed as the main species, the ammonia molecules within the complex being tetrahedrally coordinated to zinc(II) ion at a distance of (2.03±0.02) A. Analysis of the radial distribution curve obtained for the solution at the NH3/Zn ratio of 3.8 indicates formation of the mixed complex ZnCl(NH3)3+, the Zn–NH3 and Zn–Cl bond lengths being (2.00±0.03) and (2.30±0.03) A, respectively.