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Detection of the Elusive Highly Charged Zintl Ions Si4 (4-) and Sn4 (4-) in Liquid Ammonia by NMR Spectroscopy.

Neumeier, Maria ; Fendt, Franziska ; Gärtner, Stefanie ; Koch, Carina ; Gärtner, Tobias ; Korber, Nikolaus ; Gschwind, Ruth M.


It's detected! The existence of the prototypical Zintl ions Tt4 (4-) (Tt=Group 14 element), which are isoelectronic to the P4 molecule, used to be confined to the solid state. Recently, circumstantial evidence for a solution chemistry in liquid ammonia emerged. Direct spectroscopic observation of the dissolved anions has now been achieved. In the case of Si4 (4-) , this is the first solution detection of any homoatomic silicide.

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