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Issue 22, 2017
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Dicyanoaurate-based heterobimetallic uranyl coordination polymers

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The first series of uranyl ([UO2]2+)-dicyanoaurate coordination polymers and molecular complexes has been synthesized. Reactions of [A][Au(CN)2] (A = [nBu4N]+ or [(Ph3P)2N]+ ([PPN])) and uranyl nitrate in alcoholic solvents in ambient light led to [A]2[(UO2)2(μ-η22-O2)(NO3)2(μ-Au(CN)2)2], which incorporates peroxo ligands into a one-dimensional ladder topology with alternating aurophilic and peroxo rungs. Conducting the reaction with non-alcoholic solvents formed two polymorphs of a one-dimensional chain, [PPN][UO2(NO3)2Au(CN)2], from acetone, and a molecular analogue, [PPN]2[UO2(NO3)2(Au(CN)2)2], from acetonitrile, none of which exhibited aurophilic interactions. The addition of 2,2′-bipyridine to the initial reaction resulted in [UO2(bipy)(MeO)(MeOH)]2[(μ-Au(CN)2)(Au(CN)2)], a one-dimensional structure which propagates via a series of linear aurophilic bonds with pendant uranyl complexes; methanol and methoxy ligands provide additional connections through hydrogen bonding. The addition of 5,5′-dimethyl-2,2′-bipyridine using solvothermal conditions resulted in the one-dimensional ladder [UO2(Me2bipy)Au(CN)2]2[(μ-OH)2], generated through aurophilic bonds and hydroxide ligands. The incorporation of 2,2′:6′,2′′-terpyridine (terpy) using solvothermal conditions resulted in [[UO2(terpy)]2(μ-NO3)(μ-O)][Au(CN)2], a molecular salt with no aurophilic interactions. Emission spectra attributable to aurophilic interactions are observed in [nBu4N]2[(UO2)2(μ-η22-O2)(NO3)2(μ-Au(CN)2)2], while all others only show emission typical of the uranyl cation.

Graphical abstract: Dicyanoaurate-based heterobimetallic uranyl coordination polymers

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Publication details

The article was received on 15 Mar 2017, accepted on 25 Apr 2017 and first published on 16 May 2017

Article type: Paper
DOI: 10.1039/C7DT00942A
Citation: Dalton Trans., 2017,46, 7169-7180

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    Dicyanoaurate-based heterobimetallic uranyl coordination polymers

    M. L. Brown, J. S. Ovens and D. B. Leznoff, Dalton Trans., 2017, 46, 7169
    DOI: 10.1039/C7DT00942A

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