A. L. Poznyak

Crystal structure of (1,10-phenanthroline)ethylenediamine-N,N′-diacetatocopper(II) pentahydrate, [Cu(Edda)(Phen)] · 5H2O

The products of oxidation of ethylenediaminetetraacetic acid by manganese dioxide have been used to synthesize crystals of [Cu(Edda)(Phen)] · 5H2O (Edda is ethylenediamine-N,N′-diacetate, and Phen is 1,10-phenanthroline). The X-ray diffraction analysis of the crystals shows that the N atoms of the Edda and Phen ligands lie in the equatorial plane around the Cu atom, and the O atoms of the Edda ligands are localized in more remote axial positions. The [Cu(Edda)(Phen)] complexes are grouped in pairs at a distance of 3.46 Å between the mean planes of the Phen ligands. Ten water molecules are united by hydrogen bonds into symmetric isolated clusters, and further they form a three-dimensional framework with the [Cu(Edda)(Phen)] complexes.

Crystal structure of barium bis(nitrilotriacetato)cobaltate(III), Ba3[Co(Nta)2]2 · 10H2O

Crystals of Ba3[Co(Nta)2]2 · 10H2O (Nta3− is the ion of nitrilotriacetic acid) are obtained (monoclinic crystal system, a = 17.094(3), b = 13.1873(13), c = 21.490(3) Å, β = 98.457(18)°, Z = 4, space group I2/c). The crystal structure of the compound is determined by X-ray diffraction analysis. The crystals consist of the Ba2+ cations, water molecules, and [Co(Nta)2]3− anions in which the donor N and 2O atoms of each Nta3− ion are located at opposite faces of the coordination octahedron. The Co(1, 2) atoms are arranged in the inversion centers. The Ba atoms of the complexes form an intricate three-dimensional framework. One of the two crystallographically nonequivalent complexes binds eight Ba atoms, and another one binds six Ba atoms. The coordination number of the Ba(1) atoms (in the general position) is nine (three O atoms of water molecules and six O atoms of the carboxyl groups of five complexes), and that of the Ba(2) atoms (on the 2 axis) is 6 (two O atoms of water molecules and four O atoms of the carboxyl groups of four complexes).

Triethylenetetramine(3-sulfinatopropanoato-O,S)cobalt(III) isomers: Synthesis and structure of α-cis-[Co(Trien)(O2CC2H4SO2)]ClO4 · 2H2O and β-cis-[Co(Trien)(O2CC2H4SO2)]ClO4

The α-cis-and β-cis-isomers of (triethylenetetramine)(3-sulfinatopropanoato-O,S)cobalt(III) cation were synthesized and crystal structures of their perchlorates were established. The 3-sulfinatopropanoate anion, which forms six-membered ring with the Co atom, is bonded to the latter through the S atom and the carboxyl O atom.

Crystal structure of NaBa2[Co(Edta)]2(ClO4)3 · 9H2O

Crystals of Ba Na ethylenediaminetetraacetatocobaltate(III) perchlorate, NaBa2[Co(Edta)]2(ClO4)3 · 9H2O, contain two crystallographically nonequivalent Ba2+ cations and two complex cations [Co(Edta)]− (Edta4− is ethylenediaminetetraacetic acid anion), the latter anions showing opposite chirality. The nearest surrounding of the Ba2+ ions involves three water molecules (including two bridging water molecules), six O atoms of four complexes [Co(Edta)]− and the perchlorate O atom. Tetrameric fragments Ba2(H2O)4[Co(Edta)]2(ClO4)2 are united through the Ba-O bonds into layers with the Ba atoms in the middle of the layers and the perchlorate ions and complex anions at the periphery; in the latter anions, noncoordinated O atom of one of the R-metallocycles is directed outside. The Na atom of the Na(H2O)(ClO4) group located between the layers is bonded to these O atoms of the neighboring layers.