Pnicogens

Fig. 23 Dependence of metal and pnicogen charges on level of P substitution (y) in a mixed arsenide phosphide series MAsi yPy. The average pnicogen charge, qpn = yqP + l-y)q s, shown by the dashed line, balances the metal charge. Reprinted with permission from [61], Copyright Elsevier...

Tertiary stibines, R3Sb, are the most frequently used antimony ligands and the coordination chemistry of these donors to transition metals of the groups 3-12 and also to main group 13 and 15 elements has been reviewed several times, often together with other pnicogen ligands.1,2,6-8... 

Notice that in the synthesis of these compounds, and of similar phases, a relevant role is certainly played by the high volatility of the pnicogen component. 

The remarkable ideally cubic mixed metal/pnicogen Sb4 [ 0(00)314 (50), or P4[SnPhl4 (51), and tetragonally distorted metal/phosphorus P4 [CpCo]4 ( ) cubane-like clusters (Figure 4), obtained by Dahl or Schumann, may be viewed along similar lines. 

New York Times Pull Document, http //www.sanacacio.net/118-saga/story.html (accessed November 2, 2005). Nit-Picking—/ say pnicogen, you say pnictogen. http //www.chm.bris.ac.uk/motm/ pinctogenZpnictogenh.htm (accessed June 8, 2005). 

Fig. 2. Positional parameters for the pnicogen atoms of filled and unfilled skutterudites (figure from Kaiser and Jeitschko (1999)). The straight line indicates the condition for square pnicogen rings. In the figure T = Co, Rh or Ir A = light lanthanides or Yb, Ca, Sr or Ba R = light lanthanides.

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