Alkali metal-indium clusters

The mno rule can be applied to other clusters as well. Only a few examples are 

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Li, B. and Gorbett, J.D. (2004) Phase stabilization through electronic tuning electron-poorer alkali-metal—indium compounds with unprecedented In/Li clusters. J. Am. Chem. Soc., 127 (3), 926-932. 

Notes on cluster phases in triel alloys. Li and Corbett (2004) have shortly reviewed the systematic and extensive experimental and theoretical work carried out by Corbett and co-workers (see for instance Corbett 1996). Considering alkali metal-triel alloys, they underlined, particularly for Ga, In and Tl, the richness of their chemistry (see also 5.3.4.4). Gallium forms many anionic network structures (and only a few phases containing isolated cluster units), indium gives several examples of both network and discrete cluster structures, thallium forms especially discrete clusters (Tl , T157A Tl , Tl , Tl(f, Tl ). 

Indium and thallium form a number of binary compounds with alkali metals in which the group 13 elements form well-defined anionic clusters (Zintl ions, see Section 1-9). Examples are K8Inu (Fig. 6-3) which has considerably fewer (2n-4) electrons than the minimum described by Wade s rules (2n + 2), KgIn10Zn and K10In10M (M = Ni, Pd, Pt).6 Closo-In16 and nido-Inu clusters have also been found. Thallium, too, forms Zintl clusters Na2H contains Tlf tetrahedra, while K8T1ii is similar to In, and KT1 contains Tl octahedra.7... 

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