Not Too Close for Comfort

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Science  15 Sep 2000:
Vol. 289, Issue 5486, pp. 1841
DOI: 10.1126/science.289.5486.1841d

Gold can exist as a negative ion in certain compounds, and in this and other properties it resembles the halogens, especially iodine. Mudring and Jansen have found another parallel between halogens and gold; under the influence of bases, gold can disproportionate into Au+ and Au. They have characterized two materials resulting from such a reaction, Rb7Au5O2 and Cs7Au5O2. In the crystals, positively and negatively charged gold ions exist side by side; yet the Au+ and Au ions are stable and do not react with each other. — JU

Angew. Chem. Int. Ed.39, 3066 (2000).

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