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Al cluster superatoms as halogens in polyhalides and as alkaline earths in iodide salts
Authors:Bergeron D E  Roach P J  Castleman A W  Jones N O  Khanna S N
Institution:Department of Chemistry and Department of Physics, Pennsylvania State University, University Park, PA 16802, USA.
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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