The phase relationships in four tetraalkylammonium tetrafluoroborates (R4NBF4, where R = CH3 [661-36-9] , C2H5[429-06-1], n.C3H7[338-38-5], and n.C4H9 [429-42-5]) were investigated by means of dsc analysis: some solid-solid phase transitions were brought out; fusion and transition temperatures a...

The search for strategies aiming at more sustainable (oxidation) reactions has led to the application of electrochemistry for recycling the spent catalyst. In this work, an electrochemical study of the tetrapropylammonium perruthenate catalyst (TPAP) and its activity towards a primary alcohol, n...

Three electrolytes with the same anion BF4− but different cation, Et4N+, Pr4N+ and Bu4N+, are studied in combination with two binder-free carbon monoliths, one microporous and another mesoporous. The stability and working voltage window are measured. The former window broadens according to the t...

A liquid chromatographic procedure for the quantitative determination of the thiazine dye azure B, the principal constituent of Romanowsky stains, is presented. Unlike previous methods relying on peak area normalization, the present approach involves real quantitation through calibration with th...

Four tetraalkylammonium tetrafluoroborate salts were evaluated as high-temperature polar stationary phases for packed and open-tubular column gas chromatography. Tetrapropylammonium and tetraoctylammonium tetrafluoroborates were found to have too limited a temperature operating range to be gener...

This paper discusses the impact of four quaternary ammonium salts (QAS) such as tetraethylammonium tetrafluoroborate [TEA][BF4], tetrabutylammonium tetrafluoroborate [TBA][BF4], tetrahexylammonium tetrafluoroborate [THA][BF4], and tetraoctylammonium tetrafluoroborate [TOA][BF4] on the growth and...

This study performed in vitro and in vivo biological assays of the ruthenium (II) compound ct-[RuCl(CO)(dppb)(bipy)]PF6 (where, dppb = 1,4-bis(diphenylphosphine)butane and bipy = 2,2′-bipyridine). The cytotoxic activity of this compound was evaluated against different tumor cell lines (HeLa, hu...

We describe an efficient and scalable synthesis of 4-carbomethoxy-6,6′-dimethyl-2,2′-bipyridine starting from easily available substituted 2-halopyridines and based on the application of modified Negishi cross-coupling conditions. This compound is a versatile starting material for the synthesi...

In this work we revisit the role of π-acceptor character of polypyridinc ligands in the electrochemical behavior of bis and tris Fe(II) complexes [FeL3]2+ and [FeL′2]2+ and in the electron transfer with a representative redox enzyme, glucose oxidase GOD; (L = 1,10-phen, 5-chloro-1,10-phen, 5-n...

Oxidation of primary and secondary alcohols, including two diols and glycerol, with H2O2 was catalyzed by the iron(II) complexes [FeL3](OTf)2 (L = 2,2′-bipyridine, 2,2′-bipyrimidine, 1,10-phenanthroline and substituted derivatives) and [FeL2](OTf)2 (L = bis(2-pyridinylmethyl)amine, 2,6-di(2-py...

A ruthenium nitrosyl complex of formula [RuII(terpy)(F2B)(NO)](PF6)3, where terpy stands for 2,2′:6′,2″-terpyridine and F2B for 4,4′-bis(9,9′-dibutyl-9H-fluoren-2-yl)-2,2′-bipyridine, is presented and fully characterized. The X-ray crystal structure of F2B is reported. The electronic prope...

By the self-assembly of 2,3-bis(6′-methyl-2,2′-bipyridin-6-yl)pyrazine ligand L and Fe(II), Zn(II) and Cu(II) metal salts two different supramolecular complexes were obtained: mononuclear [ML2]X2 complexes (where M = Fe(II) and X = Cl− (1) or BF4− (2), M = Zn(II) and X = NO3− (3) or X = CF3SO3...

In this work, the electrochemistry of the tris(2,2‘-bipyridine) complex of iron(II) was investigated, in order to develop a better understanding of the behaviour of this complex. Two ionic liquids (ILs), based on the 1-ethyl-3-methylimidazolium cation and two ILs based on the 1-butyl-1-methylpy...

Catalytic descriptors were studied to design optimum catalysts for the oxidative coupling of methane (OCM) by combining density functional theory (DFT) calculations and actual reaction experiments. SrTiO3 perovskite catalysts, selected for OCM, were modified using metal dopants, and their electr...

The alkaline earth metals calcium, strontium and barium with the highest purities reported hitherto were prepared by metallothermic reduction of their high purity oxides with high purity aluminium in ultrahigh vacuum. The vapour pressure of aluminium at the reduction temperature is considerable ...

The potential of novel tungsten–barium titanate composites as thermionic emitters is explored. Composites ranging from 20% to 80% tungsten by mass were prepared by sintering in an Ar–H2 atmosphere. XRD and SEM studies indicate four major micro-constituents; W, BaTiO3, Ba4(Ti,Fe)12O27 and BaWO4...

A series of dichloropalladium(II) complexes (Pd1–Pd4ox) based on derivatives of the hemilabile 2-(1H-imidazol-2-yl)pyridine and 2-(oxazol-2-yl)pyridine ligands were synthesized and characterized. The ligands were designed to introduce a variety of electronic and structural features and crystal ...

Three mononuclear cobalt(II) complexes based on the 2-(4,5-diphenyl-1H-imidazol-2-yl)phenol ligand and its nitro and methoxy derivatives have been synthesized and investigated. For two of these complexes, which were derived from the parent ligand and its nitro derivative, the molecular structure...

A remarkable attention have been devoted to fabricate blue OLEDs, since it plays a vital role in the field of organic electronics particularly in full colour flat panel displays. Though, notable research outputs were emerged, it is still being a challenging task by the researchers to fulfil its ...

Cheap and environmentally friendly Fe(III) catalysts [Fe(L)2(CH3COO)] (1) and [Fe(L)2(NO3)]·2CH3OH (2) where HL = 2-(1H-benzo[d]imidazol-2-yl)phenol for epoxidation of olefins have been developed. The catalysts have been characterized by elemental analyses, IR, UV–Vis spectroscopy and by X-ray...