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Issue 22, 2003
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Cation and hydrogen bonding effects on the self-association and luminescence of the dicyanoaurate ion, [Au(CN)2]

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Abstract

The colorless salts [C5H10NH2][AuI(CN)2], [C4H8NH2][AuI(CN)2], [Ph2NNH3][AuI(CN)2]·H2O and [(n-C3H7)4N][AuI(CN)2]·H2O have been prepared by evaporation of aqueous solutions of potassium dicyanoaurate and the chloride salt of the appropriate cation. Hydrogen bonding between the cations and the cyano groups of the anions facilitates the formation of structures with strong aurophilic interactions between the anions. Thus, the [Au(CN)2] ions self-associate in the three salts [C5H10NH2][AuI(CN)2] (Au⋯Au 3.0969(3) Å), [C4H8NH2][AuI(CN)2] (Au1⋯Au2 3.0795(4) Å), [Ph2NNH3][AuI(CN)2]·H2O (Au⋯Au 3.0866(4) Å), while in [(n-C3H7)4N][AuI(CN)2]·H2O, which lacks N–H units, the gold ions are widely dispersed. The crystals of [C5H10NH2][AuI(CN)2], [C4H8NH2][AuI(CN)2] and [Ph2NNH3][AuI(CN)2]·H2O each show strong blue luminescence at room temperature, while [(n-C3H7)4N][AuI(CN)2]·H2O is non-luminescent.

Graphical abstract: Cation and hydrogen bonding effects on the self-association and luminescence of the dicyanoaurate ion, [Au(CN)2]−

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Publication details

The article was received on 21 Aug 2003, accepted on 09 Sep 2003 and first published on 23 Sep 2003


Article type: Paper
DOI: 10.1039/B310085E
Citation: Dalton Trans., 2003, 4282-4287
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    Cation and hydrogen bonding effects on the self-association and luminescence of the dicyanoaurate ion, [Au(CN)2]

    M. Stender, M. M. Olmstead, A. L. Balch, D. Rios and S. Attar, Dalton Trans., 2003, 4282
    DOI: 10.1039/B310085E

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