A procedure for the rapid, precise and accurate determination of CH3Hg+ in aqueous solutions is described. In situ derivatization by NaB(C2H5)4 to CH3HgC2H5 and Hg(C2H5)2 results in easily chromatographed species, detected by quartz furnace atomic absorption spectrometry. The absolute limit of d...

A headspace solid-phase micro-extraction (HS-SPME) method was developed and optimized for gas chromatographic separation and determination of commonly found organotin compounds in human urine after potential exposure. Butyl- and phenyltin compounds were in situ derivatized to ethylated derivativ...

This paper describes an analytical procedure to determine Me3Pb+ in aqueous solution. The method consists of ethylation of Me3Pb+ with NaBEt4 in the presence of a small volume of hexane, and keeping an excess of Pb2+. So, in only one step, the ethylation, the extraction and the concentration of ...

Aqueous ethylation and hydride generation, two rapid, convenient speciation techniques used for the determination of bityltin species in river sediments, were compared. After extracting the sediment with methanol containing 0.5 M HCl, the extract was derivatized and analysed by gas chromatograph...

A solid-phase microextraction (SPME) analytical procedure is described for the quantitative determination of methylmercury and labile Hg2+ in fish and river water matrices, The analytical procedure involves aqueous-phase derivatization of ionic mercury species with sodium tetraethylborate in a s...

Two different derivatizing reagents were tested for the development of a fast and sensitive method for the determination of selenites (SeIV) in human urine. The reagents were sodium tetraethylborate (NaBEt4) and tetraphenylborate (NaBPh4), respectively, and the procedure is based on in situ deri...

Aqueous Pb2+ samples in the low ng/g concentration range were spiked with stable isotope 206Pb standards and subsequently ethylated by a simple room-temperature reaction with sodium tetraethylborate. After extraction into heptane, samples were analyzed by gas chromatography-mass spectrometry on ...

A reliable and rapid speciation method for the simultaneous determination of butyl- and phenyltin species in biological samples has been developed. Three extraction procedures are compared: enzymatic hydrolysis and solubilization by ethanoic and hydrochloric acids. Derivatization is performed by...

Interferences affecting the determination of butyltin species by sodium tetraethylborate (STEB) derivatisation followed by purge–trap preconcentration were systematically studied using synthetic solutions, natural water samples and sediment extracts. Substances that did not cause interferences ...

Several hyphenated analytical techniques, including gas chromatography (GC) coupled with atomic fluorescence spectrometry (AFS), microwave-induced plasma atomic emission spectrometry (AES), and mass spectrometry (MS), have been evaluated for methylmercury and ethylmercury analysis following aque...

The crystal structure of two cobaloximes, [Co(CH2Br)(Hdmg)2(PPh3)] (1) and [Co(CH2CN)(Hdmg)2(PPh3)] (2) (H2dmg = dimethylglyoxime), are reported and discussed. Compound (1) crystallizes in the space group P21/c with cell parameters a = 10.221(7), b = 15.23(1), c = 19.27(1) Å β = 108.0(1)°, Z =...

This chapter discusses cobalt-catalyzed catalytic chain transfer polymerization (CCTP). The use of Co(II) macrocycles as catalytic chain transfer (CCT) agents in free radical polymerization is a convenient method for the synthesis of low-molecular-weight polymers with vinyl end-functionality. To...

The borohydride reduction of various aromatic nitrogen-containing compounds is catalysed by cobalt bromide and by bis(dimethylglyoximato) cobalt species. The products of reduction are investigated and the possible mechanisms for reduction discussed.

Aryl-substituted olefins were converted to benzyl alcohols regioselectively by the use of oxygen and tetrahydroborate in the presence of a catalytic amount of bis (dimethylglyoximato)chloro(pyridine)cobalt(III).

This chapter is a comprehensive review of the organometallic chemistry of cobalt that has been published between 1993 and early 2005. The four main sections of this chapter cover (i) the hydride derivatives, (ii) the η1-hydrocarbyl compounds of Con+ (–2

Kinetic evaluation of the oxidation of oxymyoglobin (MbO2) to metmyoglobin (Mb+) by bis(dimethylglyoximato)cobalt nitrosyl [Co(NO)(DMGH)2] has established that the mechanism of this transformation involves initial dissociation of nitric oxide from Co(NO)(DMGH)2, followed by direct oxidation of M...

The crystal and molecular structure of the title compounds has revealed that crystals of trans-bis(dimethylglyoxinate)methyltriphenylphosphinecobalt(Ill) (I) are monoclinic space group P21 with a = 10.4061(8), b = 15.54(1), c = 8.963(5) Å β = 108. 75(7)°, Z = 2 and crystals of trans-bis (dimet...

A series of neutral cobaloximes of the type Co(DH)2(B)(X) (where DH− = dimethylglyoximate anion, B = pyridine, ammonia or aniline, X− = 1−, Br−, Cl−, N−3 and NO−2 have been studied polarographically. In aqueous neutral solution, two one electron waves which correspond to the redox couple Co(III)...

Imidazole(Im), benzimidazole(BzIm), morpholine (Morph) and their derivatives react with Co(CNS)2 and dimethylglyoxime(DH2) in ethanolic medium in presence of air to form a number of new cobalt(III) complexes of the type trans-[Co(DH)2(L)(SCN)], which are characterised on the basis of electronic ...

In the presence of trimethylamine, the reaction of N,N′-benzene bis(salicylidenimine) (H2L) with NiCl2·6H2O affords a nickel(II) complex, [NiL] (1), and the reaction of H2L with NiCl2·6H2O and TCNQ provides a TCNQ compound, [LNi(TCNQ)] (2). Electrochemical studies show that 1 electrocatalyzes...