Synthesis and structure of bis(pyridine-N-oxide)hydrotetrabromo-μ-dibromodipalladium(II)

Conclusions The oxidation of palladium by bromoform in the presence of pyridine N-oxide gave bis-(pyridine N-oxide) hydrotetrabromo--dibromodipalladium(II), whose crystal structure was established.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 8, pp. 1902–1903, August, 1978.     

Crystal structures of some crystal hydrates of binary molybdates

The structures of a series of binary molybdates with the lithium cation LiM(MoO₄) · H₂O (M = K⁺, Na⁺, Rb⁺, NH ₄ ⁺ ) are analyzed and compared. Except for LiNa(MoO₄) · 2H₂O, in all other compounds the lithium cations have a tetrahedral coordination formed by the oxygen atoms of the water molecules and molybdate groups. The structure of LiNa(MoO₄) · 2H₂O was found to contain a unique coordination polyhedron of lithium, i.e., a trigonal bipyramid formed by the O atoms of the water molecules and oxo anions.     

Crystal Structure of Cesium-Sodium Molybdate Dihydrate

Structure of CsNaMoO₄ · 2H₂O crystals formed in Cs₂MoO₄–Na₂MoO₄–H₂O system is determined by X-ray diffraction study. The unit cell parameters a = 6.379(2) Å, b = 8.631(2) Å, c = 13.670(2) Å, V = 752.6(3) ų, Z = 4, M = 351.87, (calcd) = 3.105 g/cm³, space group P2₁2₁2₁. The isle crystal structure is built of MoO₄ ^2-, Cs⁺, and Na⁺ ions. The Mo–O bond lengths lie within 1.756(2)–1.769(3) Å range. The OMoO bond angle is 109.45° on average. Three oxygen atoms of MoO₄ ^2- anion are involved in hydrogen bonds with water molecules., while the fourth O atom participates in the formation of Na polyhedra only. The octahedral environment of Cs⁺ ions is formed by oxygen atoms of MoO₄ ^2- anions, without participation of water molecules. The structure contains two crystallographically independent water molecules, whose tetrahedral coordination consists of two Na⁺ ions and two MoO₄ ^2- anions.     

Coordination properties of the anionic fragments of the platinum group metal complexes in isle crystal structures

A number of Pd and Pt complexes were considered with similar structures and with the most stable states of the metal oxidation (+2 and +2, +4 for Pd and Pt, respectively). The majority of binuclear complex fragments were shown to have the planar metal coordination, whereas the anions lie in the symmetry center. The dimeric [M₂X₆]^2? anions have unusual bent conformation with different angles of bending along the line joining the bridging metal atoms occupying the general position in the elementary cell.     

Oxidation of transition metals in the liquid phase. 9. Direct synthesis and X-ray structural examination of complexes [(Me2S)AuBr] and [(Me2S)AuBr3]

Conclusions Oxidation of Au₀ in the DMSO-HBr system has given dimethyl sulfide complexes of mono-and trivalent gold, [(Me₂S)AuBr] and [(Me₂S)AuBr₃]. X-ray diffraction examination has shown that in the crystal of the first complex there are chain intermolecular contacts Au...Au (3.22 å), and in the crystal of the second, intermolecular Au...Br contacts which extend the square planar coordination of the gold atoms to distorted bipyramidal.For previous communication, see [1].Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 450–455, February, 1988.