A hybrid material composed of a polyoxometalate of type BeWO and an ionic liquid immobilized onto magnetic nanoparticles as a sorbent for the extraction of organophosphorus pesticides prior to their determination by gas chromatography.

The authors describe a method for the extraction of organophosphorus pesticides (OPPs) by using a magnetically separable sorbent consisting of a polyoxometalate of type BeWO supported on imidazole functionalized silica-coated cobalt ferrite. The sorbent was characterized by X-ray powder diffraction, field-emission scanning electron micrographs, vibrating sample magnetometry and FT-IR. The effects of the amount of adsorbent, pH value, salt concentration, extraction time, desorption solvent nature and volume and desorption time were investigated.

Preparation and characterization of magnetic Wells-Dawson heteropoly acid nanoparticles for magnetic solid-phase extraction of aromatic amines in water samples.

In this work, aminopropyl modified silica-coated magnetite nanoparticles with Wells-Dawson heteropoly acid (PWFe@APSCMNPs) was first synthesized and underwent highly efficient magnetic solid-phase extraction (MSPE) of aromatic amines from aqueous samples. The resulted nanomaterials were characterized with different physicochemical techniques such as Fourier transform infrared (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and vibrating sample magnetometry (VSM). Aniline, N,N-dimethylaniline, o-toluidine and 3-chloroaniline were selected as target compounds.

Tris(ethyl-enediamine-κ(2)N,N')nickel(II) bis-(dimethyl phosphate).

In the title compound, [Ni(C(2)H(8)N(2))(3)][O(2)P(OCH(3))(2)](2), the Ni(II) atom is six-coordinated in a distorted octa-hedral geometry by six N atoms from three ethyl-enediamine ligands. The P atoms of the anions adopt a distorted tetra-hedral geometry. In the crystal, inter-molecular N-H⋯O and C-H⋯O hydrogen bonds link the cations and anions into a three-dimensional network.

Propane-1,2-diaminium bis-(pyridine-2,6-dicarboxyl-ato-κO,N,O)mercurate(II) dihydrate.

In the title compound, (C(3)H(12)N(2))[Hg(C(7)H(3)NO(4))(2)]·2H(2)O, the Hg(II) ion is coordinated by four O and two N atoms of two pyridine-2,6-dicarboxyl-ate (pydc) ligands in a distorted octa-hedral environment. The structure contains two uncoordinated water mol-ecules. In the crystal, N-H⋯O, O-H⋯O and weak C-H⋯O hydrogen bonds and π-π stacking inter-actions between the pyridine rings of the pydc ligands, with a centroid-centroid distance of 3.