Zintl ions group

Structure and Bonding in Zintl Ions and Related Main Group Element Clusters... 

The efforts to rationalize the formulas and structures of Zintl ions and related species predated extensive definitive structural information on anionic post-transition metal clusters obtained by Corbett and his group in the 1970s [8, 9]. After enough such structural information on the bare post-transition metal clusters became available, the resemblance of their polyhedra to the known polyhedral boranes became apparent. For this reason, the simple Zintl-Klemm concept has been largely superseded by newer, more advanced descriptions of chemical bonding in such clusters, initially those applied to the polyhedral boranes. 

Abstract A complete review of the NMR, EPR, general spectroscopic properties, and the dynamic behavior of the group 14 Zintl ions and their derivatives are provided. The review focuses primarily on the and Sn NMR studies... 

Transition Metal Derivatives of the Group 14 Zintl Ions. 69... 

Table 5 Main group derivatives and exo-bonded derivatives of Group 14 Zintl ions ...

It has been shown that a variety of substituents can be attached to the outside of the group 14 Zintl ion clusters in exo positions (i.e., not vertex or interstitial positions) [70,73-78]. A variety of alkyl, aryl, and main group moieties have been attached to Ge9 and Sn9 clusters. The structures of these clusters are similar to some organos-tannane clusters prepared via different synthetic routes. This burgeoning class of compounds is rapidly developing however, little is known about the effect of the exo-substituents on the dynamic properties of the clusters. Only the RSng ions, where R = i-Pr, t-Bu, and SnCys, Sn- -Bu3, have been studied in detail [70]. 

From the pioneering work of Rudolph (group 14 Zintl ions) and Baudler (polyphosphide Zintl ions) to the modem multidimensional techniques used in current research, multinuclear NMR has played a central role in evaluating stmctures. 

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