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| - Crystal Chemistry of the Gold (I) Trimer, Au3(NC5H4)3: Formation of Hourglass Figures and Self-Association throughAurophilic Attraction
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| - X-ray crystallography reveals that individual molecules of Au3(NC5H4)3 self-associate throughaurophilic interactions into two distinct structural motifs that involve both extended chains of moleculesconnected by pairwise Au···Au contacts and individual Au···Au contacts and discrete dimers linked bypairwise Au···Au contacts. The colorless or pale yellow crystals are remarkable for the formation of a distincthourglass shape within the crystals that develops after months of standing in the atmosphere or afterimmersion in 4 M hydrochloric acid for a few days. The hourglass figures appear to result from the depositionof gold and are unusual in being formed by a chemical reaction within a crystal rather than as a result ofdying the crystal during growth.
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