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Issue 10, 2013
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An unusual fan-type polyanion with a silver cation located at the axial center, [AgAsIII2(AsIIIAsVMo4O18(OH)2)3]11−

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Abstract

A new type of polyoxomolybdate containing mixed-valence arsenic, [AgAsIII2(AsIIIAsVMo4O18(OH)2)3]11− (1), has been synthesized. Single-crystal X-ray analysis was carried out on (NH4)5(C2H9N2)4.5H1.5[AgAsIII2(AsIIIAsVMo4O18(OH)2)3]·14H2O (1a) and (NH4)11[AgAsIII2(AsIIIAsVMo4O18(OH)2)3]·16H2O (1b). The polyanion is composed of three unprecedented [AsIIIAsVMo4O18(OH)2]6− subunits linked together by two AsO3 trigonal-pyramidal structures from both sides via sharing six bridging oxygen atoms, and a silver cation is enclosed in the center of the polyanion and coordinated by three As atoms with the As–Ag–As bond angle of 120°, to lead to a fan-like structure with an approximative C3h symmetry. The polyanion was also characterized by IR, X-ray photoelectron spectroscopy and thermogravimetry-differential scanning calorimetry. The stability of [AgAsIII2(AsIIIAsVMo4O18(OH)2)3]11− in an aqueous solution was investigated by electronic absorbance spectroscopy and electrospray ionization mass spectrometry, and the possible disaggregation mechanism of the polyanion is proposed.

Graphical abstract: An unusual fan-type polyanion with a silver cation located at the axial center, [AgAsIII2(AsIIIAsVMo4O18(OH)2)3]11−

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Publication details

The article was received on 10 Oct 2012, accepted on 26 Nov 2012 and first published on 27 Nov 2012


Article type: Paper
DOI: 10.1039/C2DT32401F
Citation: Dalton Trans., 2013,42, 3410-3416
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    An unusual fan-type polyanion with a silver cation located at the axial center, [AgAsIII2(AsIIIAsVMo4O18(OH)2)3]11−

    Y. Ma, Q. Xue, S. Min, Y. Zhang, H. Hu, S. Gao and G. Xue, Dalton Trans., 2013, 42, 3410
    DOI: 10.1039/C2DT32401F

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