Synthesis of magnetic molecularly imprinted polymers for the selective separation and determination of metronidazole in cosmetic samples.

In this study, novel magnetic molecularly imprinted polymers (MMIPs) were developed as a sorbent for solid-phase extraction (SPE) and used for the selective separation of metronidazole (MNZ) in cosmetics; MNZ was detected by high-performance liquid chromatography (HPLC). First, magnetic Fe3O4 nanoparticles (NPs) were prepared by the co-precipitation of Fe(2+)and Fe(3+) ions in an ammonia solution; then oleic acid (OA) was modified onto the surface of Fe3O4NPs. Finally, the MMIP was prepared by aqueous suspension polymerization, involving the copolymerization of Fe3O4NPs@OA with MNZ as the template molecule, methacrylic acid (MAA) as the functional monomer, ethylene glycol maleic rosinate acrylate (EGMRA) as the cross-linking agent, and 2,2-azobisisobutyronitrile (AIBN) as the initiator.

Chloridobis[2-(1,3-thia-zol-4-yl-κN)-1H-benzimidazole-κN(3)]cobalt(II) chloride dihydrate.

In the title compound, [CoCl(C(10)H(7)N(3)S)(2)]Cl·2H(2)O, the Co(II) atom is five-coordinated by four N atoms from two chelating 2-(1,3-thia-zol-4-yl)-1H-benzimidazole ligands and one Cl atom in a distorted trigonal-bipyramidal geometry. In the crystal, N-H⋯O and O-H⋯Cl hydrogen bonds and π-π inter-actions between the thia-zole, imidazole and benzene rings [centroid-to-centroid distances 3.546 (2), 3.

4,6-Dichloro-5-(2-meth-oxy-phen-oxy)-2,2'-bipyrimidine.

In the title compound, C(15)H(10)Cl(2)N(4)O(2), the dichloro-pyrimidine and meth-oxy-phen-oxy parts are approximately perpendicular [dihedral angle = 89.9 (9)°]. The dihedral angle between the two pyrimidine rings is 36.

Aqua-bis-(benzoato-κO)(1,10-phenanthroline-κN,N')zinc(II).

The Zn atom in the title compound, [Zn(C(7)H(5)O(2))(2)(C(12)H(8)N(2))(H(2)O)], is five-coordinate in a distorted trigonal-bipyramidal coordination environment involving two O atoms of two monodentate benzoates, two N atoms of a 1,10-phenanthroline mol-ecule and one O atom of a water mol-ecule. The axial positions are occupied by a carboxyl-ate O atom from the benzoate ligand and an N atom from the 1,10-phenanthroline ligand [N-Zn-O = 146.90 (7)°].

[Spectroscopy characteristics of various aluminum phosphates in Al2O3-P2O5-H2O system and its high temperature products].

Various aluminum phosphates were prepared with phosphoric acid and aluminum hydroxide under different conditions. IR, XRD, Raman and SEM were used to study the structure difference and their change in heating process and particle morphology of obtained products and aluminum tripolyphosphate. The results show that the spectral characteristic change of phosphate from H2PO4-, PO4(3-), H2P3O10(3-) and PO3- can be seen when P/Al molar ratio = 3 or the condensation temperature is different.