Arsenic and Antimony Derivatives

In spite of the more metallic properties of arsenic and antimony compared to those of phosphor, known homonuclear compounds of these elements do not differ very much from equivalent phosphor derivatives. The most stable arsenic and antimony cage compounds are indeed those isoelectronic with the anion P7 described above. 

The poly arsenic compound Ba3Asi4 is prepared from the reaction of the elements at high temperature. 

Single crystal X-ray diffraction analysis of the product shows that the structure of a heptaarsenic tetracyclene is qualitatively similar to that of the anion Fj. A scheme of this structure as well as its principal molecular parameters are reproduced in Fig. 4.62. 

The addition of an excess of ethylenediamine (en) to Na-Sb alloy in the presence of ligand 2,2,2-crypt (vide infra), a strong complexing agent of alkali 

The structure of this compound (see Fig. 4.67) shows that the species Sb is isostructural with the species P7 and Asv described above. 

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Reactions of Silicon-Phosphorus, -Arsenic, and -Antimony Derivatives... 

Arsinidene and stibinidene complexes. Arsenic and antimony in their +1 oxidation state can be stabilized by a metal-arsenic (or antimony) n bond with a trigonal planar coordination. PhE[Mn(CO)2Cp]2 was prepared as its arsenic " and antimony derivatives . 

Table 30 Organolead Metal Imldes and Phosphorus, Arsenic and Antimony Derivatives...

Mercury, tin, lead, arsenic, and antimony form toxic lipophilic organometallic compounds, which have a potential for bioaccumulation/bioconcentration in food chains. Apart from anthropogenic organometallic compounds, methyl derivatives of mercury and arsenic are biosynthesized from inorganic precursors in the natural environment. 

Phosphines and arsines containing more than one olefinic group were neglected as possible multidentate ligands until Hall prepared the tris (orfAo-vinylphenyl) derivatives of phosphorus, arsenic and antimony (tvpp, tvpa and tvps) and their platinum(II) (48) and rhodium(I) (49) complexes. 

Similar reactions arc also found for organic derivatives of arsenic and antimony.139... 

Unsolvated organomagnesium compounds have been recommended for the synthesis of organometallic derivatives of mercury, boron, aluminum, silicon, germanium, tin, phosphorus, arsenic, and antimonys> 8 and have been used in procedures for the alkylation of aromatic rings and for the production of various polymerization catalysts.4 6> 9... 

Uranium and Nitrogen, Phosphorus, Arsenic, and Antimony—Uranium Carbide —Carbonates—Cyanogen Derivatives—Compounds with Silicon and Boron. 

Phosphorus trichloride, stannous chloride, and mercuric iodide give products of the type RHgX with mercury dimethyl, but cadmium iodide does not yield the above type, and antimony trichloride yields an organometallic eoznpound. Mercury diethyd reacts with the trichlorides of phosphorus, arsenic, and antimony to yield organo derivatives of these elements, aird with mercuric chloride it gives ethyl mercuric chloride. 

Morgan, G. T., Organic Derivatives of Arsenic and Antimony, Longmans, Green, London, 1918. 

A125. F. G. Mann, Chemistry of Heterocyclic Compounds, Vol. 1 Heterocyclic Derivatives of Phosphorus, Arsenic, Antimony and Bismuth, 2nd ed. Wiley (Interscience), New York, 1970. A much shorter first edition was published in 1950. A126. C. A. McAuliffe, ed., Transition Metal Complexes of Phosphorus, Arsenic and Antimony ligands. Macmillan, New York, 1973. 

Unlike helminth infections where a variety of drugs derived from arsenic, antimony, phosphorus, tin and lead have been used to eradicate intestinal and extrain-testinal parasites, only organo-arsenicals and -antimonials find use in the treatment of protozoal diseases [1-10]. 

Alkyl and aryl derivatives of bismuth can be prepared with the metal in the valence state +3 and +5. The most important methods are those used also for arsenic and antimony compounds, as discussed above. 

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