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| - Crystalline Solids of Alloy Clusters
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| - AuAg alloy clusters protected with octadecanethiol (ODT) monolayers form crystallinesolids whose powder X-ray diffractograms can be indexed to single cubic unit cells. Thesesolids can also be regarded as superlattices of alloy clusters. The bulk Au:Ag ratio issignificantly different from the metal salt feed ratio used for the synthesis of the alloy clusters.The surface plasmon resonance band of the alloy clusters shift monotonically with changein composition and only one distinct band is seen in the composition range, indicating thatthe single metal core containing alloy clusters are not forming. The shifts observed can belinearly related to the compositions. Atomic emission spectroscopy gives similar compositionsas determined from absorption spectroscopy. The monolayer coverage determined fromthermogravimetry increases with an increase in silver concentration. Thermal stability ofthe monolayers is comparable to pure Au and Ag clusters and no change in desorptiontemperature is observed with composition. Both monolayer melting and superstructuremelting transitions are seen in the differential scanning calorimetry of the solids. Infraredspectroscopy suggests that the monolayers are essentially solidlike and the conformationsare similar to the monolayers on pure Ag clusters. Some of the bands exhibit factor groupsplitting in the Au-rich composition, which is observed in other compositions upon annealing.
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