Mercury sulfur complexes

Table 15 Structural Data of Mercury(II) Sulfur Complexes...

Mercury has a strong affinity for sulfur, so it is not surprising that a large number of mercury(II) complexes... 

The use of sulfur complexes includes minimizing adsorption of water vapor on charcoals [52] and adsorption of metal ions such as cadmium [130], mercury... 

X-ray absorption spectroscopy is a powerful method to assess the structure of mercury thiolate complexes. X-ray Absorption Near Edge Structure (XANES) spectroscopy can cleanly differentiate Hg(0), Hg(I) and Hg(II) by the energy of the emission edge. Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy provides information regarding the coordination number and Hg-S bond distances. Typically, the EXAFS spectrum can establish the coordination number (/.e., number of sulfur atoms) to within 20%. More important, the bond length precision is 0.01 A. Given that each increase of one... 

Manganese(VI) complexes, 109-111 Manganese(VII) complexes, 109-111 Marcasite, 1240 Mercury compounds ruthenium complexes, 280 Mesoperrhenates, 198 Mesoporphyrin iron complexes, 1266 Methemerythrin, 254 Molybdenum-iron-sulfur complexes, 241 MOssbauer spectroscopy iron, 1181... 

The sulfur complexes are used for minimijdng adsorption of water vapor on charcoals [39], and to adsorb metal ions such as cadmium [107], mercury [108] or lead [109]. In connection with the activity of the carbon-sulfur complexes in adsorption processes, the adsorption capacity of metals is enhanced due to the formation of strong bonds between the metals and the carbon-sulfiir complexes [110]. Furthermore, the role of sulfur in understanding the mechanism of rubber reinforcem ent was discussed by Studebakcer [91]. 

Salts of several metals including lead, silver, bismuth, cobalt, copper, iron, and mercury have been used in the past for dyeing hair [45]. Among these metallic dyes, lead dyes are the only ones in commercial use today. Lead dyes contain lead acetate and sulfur [46] (Table 6-12) and react with hair to darken slowly, presumably forming lead-sulfur complexes in the cuticle layers. These products are popular among men because of the slow gradual buildup of color however, shades are limited, and the dye can react if treated subsequently with bleaches, permanent waves, and even with certain other hair dyes [16],... 

H NMR spectra (DMSO-dg) of the Ag" complexes of ruthenocenophanes (81) and (82) suggest no interaction between the ruthenium and the complexed silver ion. In this case, the methylene protons attached to sulfur atoms were shifted more than the protons of the ruthenocene nucleus. H NMR spectra of the mercury(II) complexes of (80)-(82) suggest that there is signihcant interaction between ruthenium and the mercury(II). The P protons of the Cp rings were shifted further downfield than the a protons, and the ethylene protons exhibited very little downfield shift <85BCJ3540>. 

According to Lasswitz s interpretation, then. Van Helmont s water corpuscles are made up of sub-particles in the form of mercury, sulfur, and salt. Therefore Van Helmont s water particle is a complex corpuscle, which, as Lasswitz states, verges on the molecule theory of modem chemistry. There can be no doubt that Philalethes has borrowed his own terminology of shell and kernel or nucleus from Van Helmont. The Helmontian theory of a complex, ordered corpuscle lies at the heart of Philalethes s Ripley commentary, and recurs both in the Introitus and De metallorum. Yet there is an additional aspect of Van Helmont s theory that Lasswitz was not concerned with. This is the notion of semina, a term that we have already encountered in Philalethes. 

The discovery of aqua regia by the Arab alchemist Jabir Ibn Hayyan (ad 720—813) provided a new extraction technology. Amalgamation of silver in ores with mercury was extensively used during the late fifteenth century by the Spaniards in Mexico and BoLvia. In 1861 the complex ores of the Comstock Lode, Nevada, were ground together with mercury, salt, copper sulfate, and sulfuric acid, and then steam-heated to recover the silver. 

The possible structures for isothiazoles are discussed in Section 4.01.1, and attention in this chapter will be directed mainly towards the aromatic systems, as defined in Section 4.01.1. The saturated isothiazole 1,1-dioxides (5) are known as sultams, and bicyclic compounds of structure (6) are called isopenems. Isothiazoles readily coordinate to metals (76MI41703, 78MI41701, 79MI41700, 80MI41701). Coordination usually takes place through the nitrogen atom, but sulfur coordination can occur with soft metals such as cadmium or mercury. Some specific coordination complexes are discussed in later sections. 

A similar replacement of the oxygen heteroatom by sulfur to thia-pyrylium salts (25, X = S) can occur on treatment with Na2S or NaSH. By making use of the difference in reactivity between OAlk and SAlk groups and of the strong complexation of RSH wdth mercury salts, Arndt et Traverse,Wizinger and Ulrich,... 

Amino-3-methyl-5-thione-l,2,4-triazole with [HgR(MeCOO)] (R = Me, Ph) gives complexes 186, where coordination occurs via the sulfur and amino nitrogen atoms (93JOM(450)41). In the crystalline state, intermolecular interaction of the mercury site with the endocyclic nitrogen atom of the neighboring unit is also observed. 

Complexes of Mercury(l) with Sulfur- and Selenium-Donor Ligands. 

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