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      Novel polyoxometalates: Is antimony the new molybdenum?

      Nicholson, Brian K.; Clark, Christopher J.
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      Nicholson, B.K., & Clark, C.J. (2012). Novel polyoxometalates: Is antimony the new molybdenum? Chemistry in New Zealand, 76(3), 96-98.
      Permanent Research Commons link: https://hdl.handle.net/10289/7523
      Abstract
      Polyoxometalates based on Mo, W or V have been known for a long time and present a diverse range of structures, with the [XMo₁₂O₄₀]ⁿ⁻ Keggin ions (X = P, Si ,…) perhaps the best known.¹ They are still subject to intense research with >4000 papers published in the past five years. Following on from our study² of aryl arsonic acids RAsO₃H₂, which are straightforward molecular species based on four-coordinate As(V), we became interested in the corresponding antimony compounds. Although aryl stibonic acids of nominal formula RSbO₃H₂ have been known for over 100 years,³ their composition has remained uncertain, as they form only amorphous solids, have complicated titration behaviour and only limited solubility. The presumption has been that they are polymeric, based on 5- or 6-coordinate Sb with Sb-O-Sb linkages, though direct evidence is sparse.⁴ Recently, it has been shown by Beckman that if very bulky R groups are used, then relatively simple dimers such as (2,6-Mes₂C₆H₃Sb₂O₂(OH)₄(Mes=mesityl) can be isolated, but these represent a special case.⁵
      Date
      2012
      Type
      Journal Article
      Publisher
      New Zealand Institute of Chemistry
      Rights
      This article is published in Chemistry in New Zealand. © 2012 New Zealand Institute of Chemistry.
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      • Science and Engineering Papers [3124]
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