Arsenal Group

Biomethylation may also produce more complex alkyl arsenic groups. As(C2H5)(CH3)2 has been found in landfill and sewage gas, and probably also exists in natural gas (Bentley and Chasteen, 2002), 251. As(C2H5)3 may also occur in landfill gases and probably natural gas (Bentley and Chasteen, 2002), 251. Further details on the reduction and methylation biochemistry of arsenic are discussed in Chapter 4. 

Arsenolysis Cleavage of an arsenate group from a molecule. 

An n-type (for negative type) semiconductor is an electron rich material comprised of silicon (Group IV) doped with something like arsenic (Group V). Arsenic atoms have one additional valence electron compared to silicon atoms, so the crystalline lattice has more electrons compared to pure silicon. This is shown in Figure 10.14. 

The Arsenal Group came to control the most important chemical establishments around Paris after Macquer s death in 1784. In addition to Lavoisier s stewardship of the Gunpowder Administration, Berthollet was appointed to the royal dye factory and Fourcroy to the... 

Guyton needed a new network to authenticate his proposal for the nomenclature reform. The Arsenal Group was fast emerging as the representative faction of French chemistry. A series of rhetorical moments thus ushered in the public phase of the Chemical Revolution. 

In contrast to his fleeting commitment to the oxygen theory of acidity, Berthollet maintained the dynamic understanding of chemical constitution laid out in Lavoisier s Traite, which became the conscious theoretical frontier of the Arsenal Group. In addition to Guyton, who had been nurturing a concept of phlogiston quite similar to Lavoisier s caloric in its dissolutive function, Fourcroy also incorporated heat into his... 

Berthollet s conception of caloric as a principle subject to chemical attraction or a fluid that interacted with other chemical bodies through its affinities encapsulated the Arsenal Group s vision of integrating heat as a part of chemical constitution. He shared this conception with the other authors of the Chemical Revolution. 

Protonic acid (HX) cleavage of arsenic-group IVB (Si, Ge, Sn) bonds in silyl-, germyl- or stannylarsines yields AsHj or Me AsH ... 

Bromination of compounds of the phenarsazine tyj)c (which may Im considered to be derivatives of e-aminophcnylarsimc acid) leads to replacement of the arsenic group by bromine. ... 

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