Deltahedral Zintl Ions of Tin Synthesis, Structure, and Reactivity

6 Deltahedral Zintl Ions of Tin Synthesis, Structure, and Reactivity 

Department of Chemistry and Biochemistry, University of Notre Dame, USA 2.6.1 Introduction 

Ten or so years later, in the 1930s, Edward Zintl conducted a series of more systematic studies of these systems. He carried out potentiometric titrations of liquid ammonia solutions of alkali metals with various p metal salts, typically halides. Thus, the titration of a sodium solution with lead(II) iodide revealed that the green anionic species in solution are Pbg. Zintl and coworkers also discovered that 

Some of the proposed species, such as Eg for E = Sn, Pb and Pn for Pn = As, Sb, were structurally characterized later by other groups, while the existence of other proposed species, for example Pb, Bi, Pn , Png for Pn = As, Sb, Bi, was never confirmed. Nonetheless, the recently synthesized mixed- 

The first reaction with deltahedral Zintl ions, which happened to be Sng , was reported in 1988 by Eichhorn, Haushalter, and Pennington.It was a simple ligand exchange reaction in which the labile ligand of a transition-metal complex was replaced by the Zintl ion. Thus, Sug readily replaced the ) -mesitylene in (mes)Cr(CO)3 and formed the corresponding transition-metal complex [Sn9M(CO)3] .  

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