Roles of Organic Fragments in Redirecting Crystal/Molecular Structures of Inorganic-Organic Hybrids Based on Lacunary Keggin-Type Polyoxometalates.

Lacunary polyoxometalates (LPOMs) are key precursors for the synthesis of functional POMs. To date, reviews dedicated to behavioral studies of LPOMs often comprise the role of metal ions, including transition metal (TM) and rare earth (RE) ions, in extending and stability of high-nuclearity clusters. In contrast, the role of organic ligands in the structures and properties of lacunary-based hybrids has remained less explored. In this review, we focus on the role of organic fragments in the self-assembling process of POM-based architectures and discuss relationships between the nature and structure of organic ligand and properties such as the topology of hybrid inorganic-organic material in RE and TM-RE heterometallic derivatives of lacunary Keggin-type POMs. The effects of organic fragment in mixed ligand hybrids are also briefly reviewed.

Coordination complexes of zinc and manganese based on pyridine-2,5-dicarboxylic acid N-oxide: DFT studies and antiproliferative activities consideration.

We report here the design, synthesis, and antiproliferative activity of three coordination complexes [Mn2(pydco)2(bpy)2(H2O)2]·2H2O (1), [Zn(bpy)(Hpydco)2] (2), and [Zn(bpy)Cl(Hpydco)]·2H2O (3) (H2pydco = pyridine-2,5-dicarboxylic acid N-oxide, bpy = 2,2'-bipyridine). Molecular structures of these complexes have been characterized by elemental analysis, Fourier transform infrared spectroscopy, thermogravimetric analysis, and powder and single-crystal X-ray diffraction. According to the structural analysis, 1-3 are discrete complexes containing N- and O-donor ligands (bpy and pydco2-) in which pydco2- can be coordinated to the metal centres via the N-oxide oxygen and one carboxylate oxygen to generate a six-membered chelate ring. Also, these structures benefit from extensive intermolecular interactions such as hydrogen bonds and π-interactions which are the major forces to make them more stable in the solid state. The energetic features of the π-stacking interactions observed in compounds 1-3 have been computed and compared to the H-bonds. The interactions in the solid state have been also studied using the independent gradient model approach (IGM plot). The IGM-δg approach uses a new descriptor (δg) that locally represents the difference between a virtual upper limit of the electron density gradient and the true electron density gradient. This newly developed IGM methodology automatically extracts the signature of interactions between two given fragments. Finally, the antiproliferative properties of these complexes were tested on several cancer cell lines by MTT assay and flow cytometry. Also, to compare the antiproliferative activities of these complexes with common chemotherapy drugs, the antiproliferative property of cisplatin was evaluated as a reference and positive control.

Sonoelectrochemical Synthesis of Nano Zinc(II) Complex with 2-Methyl-8-Hydroxyquinoline Ligand: a Precursor to Produce Pure Phase Nano-Sized Zinc(II) Oxide.

A new zinc complex, [Zn(mq)2], (mq = 2-methyl-8-hydroxyquinoline) was prepared via an electrochemical route from the oxidation of zinc metal in the presence of 2-methyl-8-hydroxyquinoline in a fast and facile process. The complex was fully characterized by means of NMR and IR spectra and elemental analysis. The nanostructure of the prepared compound was obtained by sonoelectrochemical process and studied by scanning electron microscopy, X-ray powder diffraction, IR spectroscopy and elemental analysis. Thermal stability of crystalline bulk and nano-size samples of the prepared compound was studied by thermal gravimetric and differential thermal analysis. The photoluminescence properties of the prepared compounds, as crystalline bulk and as nano-structure, have been investigated. The results showed a good correlation between the size and the shape of the complex particle and emission wavelength. The prepared complexes, as bulk and as nano-particles, were utilized as a precursor for preparation of ZnO nanoparticles by direct thermal decomposition at 550 °C in air. The nano-structures of ZnO were characterized by scanning electron microscopy, X-ray powder diffraction and IR spectroscopy.

2-Thienylcarbonylmethylene-triphenylphosphorane ylide.

In the mol-ecule of the title compound, (2-thienylcarbon-yl)(triphenyl-phospho-nio)methanide, C(24)H(19)OPS, the geometry around the P atom is nearly tetra-hedral and the O-C-C-P torsion angle is 2.80 (3)°. The thio-phene ring is twisted through an angle of 4.33 (4)° with respect to the plane of the carbonyl group. Inter- and intra-molecular hydrogen bonds and C-H⋯π inter-actions are present in the crystal structure.

Bis[(4-bromo-benzoyl-meth-yl)triphenyl-phospho-nium] di-µ-bromido-bis-[di-bromido-mercurate(IV)].

Colourless needle-shaped crystals of the title compound, (C(26)H(21)BrOP)(2)[Hg(2)Br(6)], have been prepared by addition of a solution of HgBr(2) in methanol to a solution of (4-bromo-benzoyl-meth-yl)triphenyl-phospho-rane in dry methanol. The compound features Hg(2)Br(6) (2-) dianions, whose site symmetry is .

Antibacterial effect of N-Naphtylen Diamine Platinum (II) Choloride as novel compound.

The present study synthesized N-Naphtylen Diamine Platinum (II) Chloride (NDPC) as a novel compound and tested ability of it regarding inhibition of cell division in some bacteria. Present results indicate that NDPC could act as antimitotic compound. It was inhibited growth of some microorganism as experimental organisms. The most antimitotic effect was seen in pseudomonas aeurginosa that treated by 15 mg mL(-1). Application of NDPC in all concentrations also was inhibited division and growth of other bacterial cells. Although Escherichia coli is less sensitive to NDPC than others, but also inhibition of growth is significant in E. coli.