Arsenic transition metal complex

Although trialkyl- and triarylbismuthines are much weaker donors than the corresponding phosphoms, arsenic, and antimony compounds, they have nevertheless been employed to a considerable extent as ligands in transition metal complexes. The metals coordinated to the bismuth in these complexes include chromium (72—77), cobalt (78,79), iridium (80), iron (77,81,82), manganese (83,84), molybdenum (72,75—77,85—89), nickel (75,79,90,91), niobium (92), rhodium (93,94), silver (95—97), tungsten (72,75—77,87,89), uranium (98), and vanadium (99). The coordination compounds formed from tertiary bismuthines are less stable than those formed from tertiary phosphines, arsines, or stibines. 

C. A. McAuliffe and W. Levason, Phosphine, Arsine and Stibine Complexes of the Transition Elements, Elsevier, Amsterdam, 1979, 546 pp. A review with over 2700 references. See also C. A. McAuliffe (ed,), Transition-Metal Complexes of Phosphorus, Arsenic and Antimony Donor Ligands, Macmillan, London, 1972,... 

C. A. McAuliffe (ed.), Transition Metal Complexes of Phosphorus, Arsenic and Antimony Ligands, Macmillan, London, 1973, 428 pp. 

Me Auliffe, C A. (ed.) Transition metal complexes of phosphorus, arsenic and antimony ligands. London Me Millan 1973... 

The As—N bond is labile and this has been widely exploited in synthetic arsenic chemistry. Some idea of the versatility168 can be seen from Schemes 1 and 2. Refluxing secondary amines with tris(dimethylamino)arsine effects transamination (equation 6). These tris(dialkyl-amino)arsines undergo the general reactions in Scheme 1, enabling ready access to a wide variety of compounds, many of them finding use as ligands in transition metal complexes (see Chapter 14 of this work). 

Macrocyclic polyarsanes (43) have been reported by Ennen and Kauffman.62 The complexation tendencies of these ligands are as yet unexplored, although they should, due to the soft arsenic donors, form stable transition metal complexes. 

S. D. Robinson Transition metal complexes containing phosphorus, arsenic, antimony and bismuth donor ligands. 

XVI. Transition Metal Complexes Containing Other Ligands with Nitrogen, Phosphorus, or Arsenic Donor Atoms... 

A cationic Sb(III) ligand is part of the tungsten complex [Cp(CO)2(Me3P)WSb(Me)-(Cl)Bu ]I, which was prepared from tr ns-Cp(CO)2(MeP)WSb(Cl)Bu and Mel in Et20 . The first transition metal complexes containing a metal-arsenic double bond were synthesized in 1983 . Transition metal substituted arsines of the type Cp(CO)3M—AsBu 2 (M = Mo, W) show increased Lewis basicity compared with triorganoarsines R3AS. From the above-mentioned complex one carbonyl is cleavable already at 60 °C (equation 35). 

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