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The Dawson-like polyoxometalate clusters (TEAH)(6)[H(2)W(18)O(57)(SO(3))] (1) and (DMAH)(8)[W(18)O(56)(SO(3))(2)(H(2)O)(2)] (2) were synthesized under similar reaction conditions by employing triethanolammonium (TEAH(+)) and dimethylammonium (DMAH(+)) as cations, respectively. Crystallographic studies revealed that compound 1 has a compressed, peanut-like {W(18)} cage containing a single sufilte anion where each cage metal atom supports one terminal oxo-based ligand whereas compound 2 also has a {W(18)} cage, but four of the eighteen cage metal atoms support two terminal oxo-based ligands with two sulfite anions embedded in the cluster.
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Yan et al. (2010) studied this question.
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