It has been found that the conventional low-voltage d.c. anodization of a zirconium electrode in an aqueous terbium(III)-containing sodium acetate solution furnishes an electrode surface with a thin oxide layer which may contain terbium at levels up to around 35 at.% at the surface. The cathodic...

There is much interest in understanding the biokinetics of zirconium in humans due to the potential radiological risk represented by the radionuclide 95Zr and by its daughter 95Nb. Despite the significance of zirconium, few data are available on the actual biokinetics of zirconium in humans. Acc...

Several new Ru(II) complexes of tris(2-aminoethyl)amine (Tren) and diethylenetriamine (Dien) have been prepared using Ru(PPh3)3Cl2 and [(CH3)4N]2[Ru(Phen)Cl4] (1) as starting materials. The reaction of Tren or Dien with Ru(PPh3)3Cl2 leads to the formation of either the [Ru(Tren)(PPh3)Cl]Cl (2) o...

Condensations of salicylaldehyde and 4-chlorosalicylaldehyde with (R)-α-methylbenzylamine in refluxing ethanol afforded the chiral Schiff base ligands (R)-N-(1-phenylethyl)salicylidene (HL1∗) and (R)-N-(1-phenylethyl)(4-chlorosalicylidene) (HL2∗), respectively. Similarly, reaction of 3,5-di-ter...

The reaction of [Ru(H)(Cl)(CO)(PPh3)3] (1) with KTp* (KTp* = Potassium tris(3,5-dimethylpyrazolyl)borate) in a refluxing toluene yields a mixture of [RuTp*(H)(CO)(PPh3)] (2), [Ru(H)(Cl)(pz*H)(CO)(PPh3)2] (3), and [H(pz*)B(μ-pz*)2B(pz*)H] (4) (pz*H = 3,5-dimethylpyrazole). The products (3) and (...

Ruthenium complexes have been assessed as anti-tumor agents against cancer cells. In this project, new heteroleptic ruthenium(II) complexes with general formulae [Ru(L)(bipy)(dppb)](PF6) (where L = N,N-disubstituted-N′-acylthiourea, bipy = 2,2′-bipyridine and dppb = 1,4-bis(diphenylphosphino)b...

A nanocomposite based on the incorporation of the complex 4′-(4-carboxyphenyl)-2,2′:6′,2″ terpyridine triphenylphosphine diacetonitrile ruthenium(II) tetrafluoroborate with multiwalled carbon nanotubes and ionomer supported upon a glassy carbon electrode substrate is reported and characteriz...

Ionic organometallic ruthenium(II) complexes, [η5-CpRu(PPh3) (1,10-phenanthroline)]+Cl− 1, [η5-CpRu(PPh3) (4,7-dimethyl, 1,10-phenanthroline)]+Cl− 2, and [η5-CpRu(PPh3) (1,10-phenanthroline-5-amine)]+Cl− 3 have been synthesized and characterized. The molecular structures of the complexes 1 an...

The reaction of RuCl2(PPh3)3 with benzonitrile has been investigated in toluene. When excess benzonitrile is employed cis-RuCl2(PPh3)2(NCPh)2 is obtained and has been characterized by X-ray diffraction. This contrasts to acetonitrile which yields trans-RuCl2(PPh3)2(NCMe)2. With excess RuCl2(PPh3...

A novel method for synthesis of diamagnetic Ru(II) carborane clusters based on reduction of corresponding Ru(III) species by amines was developed. The interaction of paramagnetic 17-electron complex (1) with aliphatic amines in dichloromethane solution at 40 °C proceeds with the abstraction of...

(p-Cymene)-ruthenium bioconjugates ML (1) and ML2 (2), bearing phosphane ligands substituted with chiral or non-chiral amino acid esters, L, were synthetized and characterized by instrumental methods (NMR, CD, MS) and DFT calculations (using the wB97xD functional). Cytotoxic activity of complexe...

Peraksine (Va) an alkaloid from Rauwolfia perakensis is shown to be a representative of a new type of hexacyclic indole alkaloid related to perakine. Its structure was established from the analysis of the X-ray diffraction data obtained from the methiodide and by the chemical and mass spectral e...

Remarkable atrazine degradation in the S(IV) autoxidation process catalyzed by Fe2+-Mn2+ (Fe2+/Mn2+/sulfite) was demonstrated in this study. Competitive kinetic experiments, alcohol inhibiting methods and electron spin resonance (ESR) experiments proved that sulfur radicals were not the major ox...

The inclusion behavior of Solvent Violet 9 (SV9) with 4-sulfonatocalix[n]arenes (SCXn) (n = 4, 6, 8) was investigated at various pH values by ultraviolet–visible spectroscopy. SV9 is able to form an inclusion complex with calixarenes. Different absorption behaviors were observed for the dye wit...

The method for the determination of blue dye Solvent Blue 35 (SB 35) in diesel fuel by high performance liquid chromatography (HPLC) coupled with UV-VIS detection was developed. The dye is separated from the hydrocarbon sample matrix and determined as a single component at 650 nm wavelength. Sol...

Color Index (C.I.) Disperse Blue 291 (DB291) is an azo dye used by the textile industry. After yarn dyeing, wastewater containing the dye, released into the aquatic environment, may pollute drinking water sources. We investigated the mutagenicity and genotoxicity of DB291 in male Swiss mice, fol...

The hydration entropy of ions is calculated from their entropy in the ideal gaseous state and the standard entropy of their aqueous solutions. The application of the tetraphenylarsonium tetraphenylborate (TATB) and the cognate tetraphenylphosphonium tetraphenylborate (TPTB) assumptions in obtain...

The solvation states of the sodium ion (Na+) and the tetraphenylborate ion (BPh4−) in 3-methylpyridine (3MP) and its mixture with deuterium oxide (D2O) were investigated by Raman spectroscopy and DFT calculations. Raman spectra observed for the 3MP solutions systematically varied with increase i...

Background and objectiveOne of the main causes of bacterial resistance to antimicrobials is multidrug resistance induced by the increased efficiency of the efflux pumps. In this study we analyzed how the conditions of assay affect the efflux of indicator substrates ethidium (Et+) and tetraphenyl...

A visual indicator method has been developed for the titration of tetraphenylborate (TPB) with a 5 × 10−5, M tetraphenylphosphonium (TPP) solution. A hydrophobic dye, tetrabromophenolphthalein ethyl ester (TBPE), is used as an indicator in the presence of 1,2-dichloroethane. The organic phase c...