Hydrothermal synthesis, crystal structure and properties of Ag(I)-4f compounds based on 1H-benzimidazole-5,6-dicarboxylic acid.

Seven novel heterometallic coordination polymers [CeAg(Hbidc)(2)(H(2)O)(2)] (1) and [LnAg(Hbidc)(2)]·3(H(2)O)[Ln = Sm (2), Gd (3), Tb (4), Dy (5), Ho (6), Er (7), H(3)bidc = 1H-benzimidazole-5,6-dicarboxylic acid] have been synthesized under hydrothermal conditions and characterized by elemental analysis, FT-IR, TG analysis, and single crystal X-ray diffraction. X-Ray analysis revealed that the seven complexes present two different types of three-dimensional (3D) structures. Complex 1 crystallized in an orthorhombic manner having a Pna2(1) space group, consisting of a 3D framework with a 1D heterometallic chain.

Study on luminescence properties of Eu2+ in BaAl12O19 matrix.

Eu(2+)-doped BaAl12O19 phosphors were prepared using the sol-gel method, and their structure and luminescence properties were characterized by X-ray diffraction (XRD) analysis and fluorescence spectrometry. The results showed that a single hexagonal BaAl12O19 crystal structure was synthesized and the emission spectrum of BaAl12O19:Eu exhibited a broad asymmetric band from 375 to 600 nm, which was composed of three emission peaks at 438, 462, and 511 nm. The effects of crystallization temperature, Eu2+ concentration, and Al3+ content on the occupation of Eu2+ in three crystallographic positions were investigated.

Synthesis, characterization, DNA interaction, and cytotoxicity of novel Pd(II) and Pt(II) complexes.

Four complexes [Pd(L)(bipy)Cl].4H(2)O (1), [Pd(L)(phen)Cl].4H(2)O (2), [Pt(L)(bipy)Cl].

New pH-dependent complexes, from mononuclear Pd(II) monomer to heteronuclear [Pd(II),K(I)]Polymer: DNA cleavage and cytotoxicity in vitro.

Two novel complexes, namely, [Pd(pdc)(2)].(dmp).6H(2)O (1) and [Pd(pdc)(2)K(H(2)O)(5).

Synthesis, characterization, interaction with DNA and cytotoxicity in vitro of the complexes [M(dmphen)(CO3)].H2O [M=Pt(II), Pd(II)].

The complexes [Pt(dmphen)CO3].H2O (1), [Pd(dmphen)CO3].H2O (2) (dmphen is 2,9-dimethyl-1,10-phenanthroline) have been synthesized and characterized.

Potassium aqua-terbium(III) oxalate sulfate.

Single crystals of KTb(C(2)O(4))(SO(4))(H(2)O), potassium aqua-terbium(III) oxalate sulfate, were obtained under hydro-thermal conditions. In the crystal structure, the Tb(III) atom is coordinated by four O atoms from two oxalate anions, three O atoms from three sulfate anions and one O atom from a water mol-ecule within a TbO(8) distorted square antiprismatic coordination. The potassium and terbium(III) atoms are bridged by the oxalate and sulfate groups, forming a three-dimensional structure.

The synthesis of ursolic acid derivatives with cytotoxic activity and the investigation of their preliminary mechanism of action.

Nineteen ursolic acid derivatives (15 novel compounds) modified at the C-3 and the C-28 positions were synthesized. The cytotoxic activity of the derivatives was evaluated against HeLa, BGC-823 and SKOV3 cells by MTT assay. Inducing apoptosis and affecting cell cycle distribution by the derivatives in HeLa cells were assessed by flow cytometry and DNA fragmentation.

Simultaneous determination of iron and zinc by pH gradient construction in a flow-injection system.

A flow-injection method for the simultaneous determination of iron and zinc in the human hair with 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (5-Br-PADAP) using a pH gradient technique has been developed. The linear range for the determination of iron is 0.1 approximately 1.

Highly sensitive colour-reaction of nickel with a new chromogenic reagent benzothiaxolyldiazoaminoazobenzene and its application.

The synthesis of benzothiaxolyldiazoaminoazobenzene (BTDAB) is described, and a simple, rapid and sensitive procedure for spectrophotometric determination of nickel has been developed. At pH 9.4, in the presence of emulsifier p-octylpolyethyleneglycol phenylether (OP), the reagent reacts with nickel to form a red 1:3 (metal:ligand) complex.

Synthesis, characterization, interaction with DNA and cytotoxicity in vitro of dinuclear Pd(II) and Pt(II) complexes dibridged by 2,2'-azanediyldibenzoic acid.

The dinuclear complexes [Pd(2)(L)(2)(bipy)(2)] (1), [Pd(2)(L)(2)(phen)(2)] (2), [Pt(2)(L)(2)(bipy)(2)] (3) and [Pt(2)(L)(2)(phen)(2)] (4), where bipy=2,2'-bipyridine, phen=1,10-phenanthroline and L=2,2'-azanediyldibenzoic dianion) dibridged by H(2)L ligands have been synthesized and characterized. The binding of the complexes with fish sperm DNA (FS-DNA) were investigated by fluorescence spectroscopy. The results indicate that the four complexes bound to DNA with different binding affinity, in the order complex 4>complex 3>complex 2>complex 1, and the complex 3 binds to DNA in both coordination and intercalative mode.

A novel binuclear palladium complex with benzothiazole-2-thiolate: synthesis, crystal structure and interaction with DNA.

The novel Pd(II) complex, [Pd(2)(micro-bzta)(4)].1.5DMSO (where bzta=benzothiazole-2-thiolate) has been synthesized and structurally characterized by element analysis, IR and single-crystal X-ray diffractometry.

Biodegradation of pentyl amine and aniline from petrochemical wastewater.

The objectives of the project were to isolate a bacterial strain capable of degrading pentyl amine and aniline and to define the optimal pentyl amine and aniline degradation conditions for this bacterial strain. The bacterial strain was isolated from activated sludge obtained from a Northeastern China treatment facility for petrochemical wastewater rich in pentyl amine and aniline. Once the strain was isolated, five triplicate (5) batch tests were used to establish the conditions for maximum pentyl amine and aniline degradation, by varying one at a time the following five factors: temperature, pH, reaction time, pollutant concentrations and aeration rate.

[Simultaneous determination of tungsten, molybdenum and titanium by k-factor dual-wavelength standard addition method].

In this paper, a new method for simultaneous spectropthotometric determination of tungsten, molybdenum and titanium is proposed. The method is based on the difference of absorption spectra of the three elements forming coloured complexes with PF in acidic medium and in the presence of nonionic surfactant Tween-80. The absorbance of sample was measured at wavelengths of 503, 530 and 560 nm, and the data were treated by the principle of the k coefficients and dual-wavelength standard addition method.

Spectrophotometric determination of nickel with p-acetylarsenazo.

A spectrophotometric method for the determination of trace amounts of nickel is described. At pH 6, nickel reacts with p-acetylarsenazo to form a 1:2 coloured complex with an absorption maximum at 630 nm. The apparent molar absorptivity is 6.