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Issue 33, 2012
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The antimony(III)-bridged heteropolyanion sandwich dimers [SbIII3(A-α-XW9O34)2]11− (X = SiIV, GeIV) and C-shaped double-sandwich [SbIII6O2(PW6O26)(A-α-PW9O34)2]15−

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Abstract

Interaction of potassium antimony(III) tartrate hydrate K2(SbC4H2O6)2·3H2O with the trilacunary Keggin derivatives [A-α-XW9O34]10− (X = SiIV, GeIV) and [A-α-PW9O34]9− in aqueous acidic medium (pH 4.8) resulted in three novel polyanions, [Sb3(A-α-XW9O34)2]11− (X = SiIV (1), GeIV (2)) and [Sb6O2(A-PW6O26)(A-α-PW9O34)2]15− (3), which were isolated as the hydrated potassium salts K11[Sb3(A-α-XW9O34)2]·31H2O (X = SiIV (K-1), GeIV (K-2)) and the mixed potassium–sodium salt K14Na[Sb6O2(A-PW6O26)(A-α-PW9O34)2]·61H2O (KNa-3) salts, respectively, and characterized by single-crystal X-ray diffraction, IR spectroscopy, as well as elemental and thermogravimetric analyses. The SbIII-containing polyanions 1–3 possess unique structural features, as they represent the first examples of sandwich-type POMs with trigonal-pyramidal SbIIIO3 linkers. The stability of 1–3 in aqueous media was investigated by multinuclear (183W, 31P) NMR and UV-Vis spectroscopy.

Graphical abstract: The antimony(iii)-bridged heteropolyanion sandwich dimers [SbIII3(A-α-XW9O34)2]11− (X = SiIV, GeIV) and C-shaped double-sandwich [SbIII6O2(PW6O26)(A-α-PW9O34)2]15−

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Publication details

The article was received on 16 Feb 2012, accepted on 27 Mar 2012 and first published on 27 Apr 2012


Article type: Paper
DOI: 10.1039/C2DT30355H
Citation: Dalton Trans., 2012,41, 9914-9921
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    The antimony(III)-bridged heteropolyanion sandwich dimers [SbIII3(A-α-XW9O34)2]11− (X = SiIV, GeIV) and C-shaped double-sandwich [SbIII6O2(PW6O26)(A-α-PW9O34)2]15−

    A. S. Assran, N. V. Izarova, A. Banerjee, U. M. Rabie, M. H. M. Abou-El-Wafa and U. Kortz, Dalton Trans., 2012, 41, 9914
    DOI: 10.1039/C2DT30355H

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