Journal ArticleDOI
Aluminum cluster reactions
TLDR
In this article, aluminum clusters were produced using laser vaporization and reacted under thermal conditions with oxygen in a flow tube reactor, and an etching reaction was observed and bimolecular rate constants were reported for Al+n, n=1-33, and Al−n n=5-37.Abstract:
Aluminum clusters, both anion and cation, are produced using laser vaporization and reacted under thermal conditions with oxygen in a flow tube reactor. An etching reaction is observed and bimolecular rate constants are reported for Al+n, n=1–33, and Al−n, n=5–37. For certain clusters, namely Al+7, Al−13, and Al−23, no apparent reactivity is observed (they are found to be produced from larger species). Interestingly, these correspond to predicted jellium shell closings with 20, 40, and 70 electrons, respectively. Besides these exceptions, and a small odd/even alternation in reaction rates, the overall reactivity is relatively insensitive to cluster size, and is found to range between about 1 × 10−12 and 5 × 10−12 cm3/s.read more
Citations
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Journal ArticleDOI
Clusters: Structure, Energetics, and Dynamics of Intermediate States of Matter
A. W. Castleman,Kit H. Bowen +1 more
TL;DR: The field of cluster research can trace its origins back to the mid-nineteenth century when early studies of colloids, aerosols, and nucleation phenomena were reported.
Journal ArticleDOI
Cluster-Assembled Materials
Shelley A. Claridge,A. W. Castleman,Shiv N. Khanna,Christopher B. Murray,Ayusman Sen,Paul S. Weiss +5 more
TL;DR: Examples of building block syntheses, assembly strategies, and property control achieved to date are discussed and methods developed to control their design and function are discussed.
Journal ArticleDOI
Formation of Al13I-: evidence for the superhalogen character of Al13.
TL;DR: Experimental evidence is presented for a very stable cluster corresponding to Al13I–, which features a structurally unperturbed Al13– core and a region of high charge density on the aluminum vertex opposite from the iodine atom.
Journal ArticleDOI
Clusters, Superatoms, and Building Blocks of New Materials†
A. W. Castleman,Shiv N. Khanna +1 more
TL;DR: The physical and chemical properties of cluster systems at the subnano and nanoscale are often found to differ from those of the bulk and display a unique dependence on size, geometry, and composition as mentioned in this paper.
Journal ArticleDOI
Al Cluster Superatoms as Halogens in Polyhalides and as Alkaline Earths in Iodide Salts
Denis E. Bergeron,Denis E. Bergeron,Patrick J. Roach,Patrick J. Roach,A. W. Castleman,A. W. Castleman,N. O. Jones,N. O. Jones,Shiv N. Khanna,Shiv N. Khanna +9 more
TL;DR: 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 and the potential synthetic utility of superatom chemistry built upon these motifs is addressed.
References
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