Vasyl I. Pekhnyo

N-Hydroxyhomoazaadamantanone and its complexes with dioxo-molybdenum(VI) and copper(II): synthesis and structure

A hydroxamic acid of a new type, N-hydroxyhomoazaadamantanone (HL), has been synthesized, combining several structure peculiarities: cage skeleton, heterocyclicity, and rigidly fixed cis-orientation of the oxygens of the hydroxamate fragment of the molecule. Complexes of HL with dioxo-molybdenum(VI) ((MoO2LC2H5OH)2O) and copper(II) (CuL2) have been synthesized. All compounds were characterized by IR and 1H NMR spectroscopy. X-ray structural analyses of N-hydroxyhomoazaadamantanone hydrochloride and the coordination compounds have been carried out. Graphical Abstract

Tetra-aqua-bis[(1-ammonio-1-phosphono-ethyl)phospho-nato]zinc(II) tetra-hydrate.

The title compound, [Zn(C2H8NO6P2)2(H2O)4]·4H2O, was synthesized by the reaction of ZnCl2 with 1-aminoethane-1,1-diyldiphosphonic acid in aqueous solution. The asymmetric unit contains one-half of the complex and two water molecules of solvation. The Zn atom occupies a special position on an inversion centre. This results in a slightly distorted octahedral coordination environment, which consists of the O atoms from two phosphonic acids and four water molecules. The crystal structure displays N—H⋯O and O—H⋯O hydrogen bonding, which creates a three-dimensional network.

Crystal structure and spectral characteristics of Bis(1-adamantyl acetoacetato)copper(II)

AbstractThe structure of a new complex bis(1-adamantyl acetoacetato)copper(II) was studied by X-ray crystallography, electronic absorption spectroscopy in the visible, and vibrational spectroscopy. Copper atoms have a square coordination in both solutions and crystals. The crystals are triclinic, space group P

Ammonium 1-ammonio­ethane-1,1-diylbis(hydrogenphospho­nate) dihydrate

\bar 1

Hexapotassium di-μ-dioxosulfato-bis­[tetra­cyano­osmate(III)](Os—Os) dihydrate

, a = 6.9389(6) Å, b = 9.0697(8) Å, c = 11.4280(10) Å, α = 109.279(4) °, β = 100.179(4)°, γ = 98.171(4)°, V = 652.45(10) Å3, Z = 2. Molecules form the crystals only due to van der Waals forces, because Cu-C intermolecular interactions, which are characteristic of other β-dicarbonyl complexes of copper(II), are absent.

Synthesis and crystal structure of N-(4-chloro­phen­yl)-5,7-dimethyl-1,2,4-triazolo[1,5-a]pyrimidin-2-amine

In the title compound, [PdCl2(C7H9NO)2], the Pd atom is situated on a crystallographic centre of inversion. The coordination environment of the Pd atom shows a slightly distorted square-planar geometry. The crystal structure exhibits weak intermolecular Pd⋯Cl interactions, with Pd⋯Cl distances of 3.6912 (6) Å. A chain-like arrangement of molecules realized by intermolecular N—H⋯Cl hydrogen bonds is observed along [010].

Crystal structure of hexa-kis-(μ2-4-tert-but-oxy-4-oxobut-2-en-2-olato)trizinc.

The title compound, NH4 +·C2H8NO6P2 −·2H2O, was obtained by the reaction between 1-aminoethane-1,1-diyldiphosphonic acid and ammonium hydroxide (1:1) in an aqueous solution. The asymmetric unit contains one anion with two H atoms transferred from the phosphonic acid groups to the amino group of the anion and to an ammonia molecule, giving an ammonium cation. The structure displays N—H⋯O and O—H⋯O hydrogen bonding, which creates a three-dimensional network.

trans-Dichloridobis(2-methyl-aniline-κN)palladium(II).

The title compound, C5H15NO6P2, was obtained by the reaction of pentanenitrile with PCl3 followed by the dropwise addition of water. The asymmetric unit contains one molecule, which exists as a zwitterion with a positive charge on the –NH3 group and a negative charge on one of the phosphonic O atoms. The crystal structure displays N—H⋯O and O—H⋯O hydrogen bonding, which creates a three-dimensional network.