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Al Cluster Superatoms as Halogens in Polyhalides and as Alkaline Earths in Iodide Salts

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Science  14 Jan 2005:
Vol. 307, Issue 5707, pp. 231-235
DOI: 10.1126/science.1105820

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Abstract

Two classes of gas-phase aluminum-iodine clusters have been identified whose stability and reactivity can be understood in terms of the spherical shell jellium model. Experimental reactivity studies show that the Al13I x clusters exhibit pronounced stability for even numbers of I atoms. Theoretical investigations reveal that the enhanced stability is associated with complementary pairs of I atoms occupying the on-top sites on the opposing Al atoms of the Al13 core. We also report the existence of another series, Al14I x, that exhibits stability for odd numbers of I atoms. This series can be described as consisting of an Al14I 3 core upon which the I atoms occupy on-top locations around the Al atoms. The potential synthetic utility of superatom chemistry built upon these motifs is addressed.

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