Hg compounds

Cd/Cd compounds carbon tetrachloride chloroform Cr/Cr compounds CN-compounds /HCN Pb/Pb compounds Hg/Hg compounds methylene chloride methyl ethyl ketone methyl isobutyl ketone Ni/Ni compounds tetrachloroethylene toluene... 

Ethylene imine Hydrazine hydrate Hydrogen sulfide. Hydroxylamme salts Inorganic Hg. compounds lodates Iodides... 

Various substituted sulfonylurea derivatives, partly in use as diabetes drugs, have been coordinated to Cd and Hg. Besides the IR and [H NMR spectra of several species, the structures of one each of the Cd and Hg compounds have been solved.155 In the Cd complex three ligands act as... 

In many closely related compounds of Cd and Hg with all-oxygen or oxygen dominated coordination spheres, the metals adopt different coordination numbers and geometries—even independent metals in the same structure. As a rule, in the rare isostructural Cd and Hg compounds, Hg possesses the more distorted coordination. 

As the structures of comparable or analogous Cd and Hg compounds are often different, they... 

Electroreductive removal of the chlorine atom from 2-methyl-3-chlorocyclopenten-1 -one (466) has been performed in an aqueous Me0H-H2S04-(Hg) system at —0.80 to —0.85 V (SCE) (Scheme 160) [552]. In the course of the reaction, an Hg compound is produced in a dimeric form, which undergoes further reduction to yield... 

Deprotonation of the parent complex occurred with LiBu the lithio derivative was converted to the SnBus and Ru(CO)2Cp complexes, or the Hg derivative containing two C7 chains. The IR p(CO) spectra of the Ru and Hg compounds are at significantly lower wavenumbers than the others, suggesting that form S is more important. 

Table 1 can be used as a guide to define hazardous wastes from textile plants. Besides the direct toxicity of substances like chlorinated hydrocarbons, organo-Hg compounds, or concentrated alkaline solutions, other parameters have been defined with regard to problems during biodegradation or accumulation in the sludge from CWWT. A particular situation is found with colored effluents, where limits for spectral absorption have been defined. While the toxicity of textile dyes is comparably low, these limits were derived from the visual aspect of the water released from a textile plant because they look unhealthy. ... 

One of the subjects that is still quite intensively developed (using electrochemical methods frequently combined with nonelectrochemical techniques) concerns reduction of Hg compounds at various surfaces (e.g. Pt or Au), with the emphasis laid on underpotential deposition (UPD) of mercury. Deposition of mercury on other metals is generally important for better understanding of the mechanism of the formation of amalgams. Moreover, underpotential Hg deposition characteristics constitute a significant source of information on Hg-metal interactions. In turn, mercury film electrodes obtained by such deposition have a significant appKcation in electrochemical analysis ofvarious species. 

In analogy to sample introduction by hydride generation, mercury trace analysis is possible by reducing Hg compounds to the metal using the cold vapour technique or the determination of iodine at the ultratrace level (after oxidation with 70 % perchloric acid of iodide to iodine) via the gas phase. 

HG compounds have functional groups more labile to hydrolysis. For compounds that can be deduced to be reactive but for which no measured or calculated rate constants can be obtained, rate constants can often be estimated semi-quantita-tively by comparison to compounds for which hydrolysis data are available. 

By reaction of /ram -[(NH3)2Ptri-MeCyH2,AY4j)2 2+ with Hg2+ ions a novel dinuclear Pt,Hg compound has been recently reported, where the bases are reversed with respect to the Pt,Hg complex described above. The heterometal is bound through the N(3) sites of the two cytosine rings (III, Fig. 5) [35],... 

The Hg compounds are also the least reactive towards air or water, partly because the competing Hg 0 bond is so much weaker than with Zn or Cd, they are useful for preparing organometallic compounds of... 

Scheme 5 Synthesis of organoboron compounds via transmetallation with Zr and Hg compounds.

Mercury, as the only liquid metal, is always playing an extraordinary role. The element Hg as well as its compounds show physical-chemical properties quite different from those of other metals. The most important Hg compounds can be classified in the following three groups (1) elementary Hg (2) inorganic Hg(I)... 

Further developments are expected due to the nonspecificity of the ECD detector. The possibility of coelution with other compounds has triggered the interest in interfacing chromatography systems to Hg-specific detectors. The volatility of zerovalent Hg and the ease of thermal decomposition of alkyl-Hg compounds have allowed for a wide variety of solutions that use cold vapor (CV) atomic absorption spectrometry (AAS) in a fused silica quartz cell. Significant improvements were observed when the atomization and detection were performed directly in the fused silica furnace at 780°C using an 02 flow and after considerable reduction of the transfer lines [26],... 

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