<?xml version='1.0' encoding='utf-8'?>
<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:contributor>B. M. Gatehouse</dc:contributor>
  <dc:contributor>P. Leverett</dc:contributor>
  <dc:creator>Howard T. Evans Jr.</dc:creator>
  <dc:date>1975</dc:date>
  <dc:description>&lt;p&gt;The crystal structures of the isomorphous salts M&lt;small&gt;&lt;sup&gt;I&lt;/sup&gt;&lt;/small&gt;&lt;small&gt;&lt;sub&gt;6&lt;/sub&gt;&lt;/small&gt;[Mo&lt;small&gt;&lt;sub&gt;7&lt;/sub&gt;&lt;/small&gt;O&lt;small&gt;&lt;sub&gt;24&lt;/sub&gt;&lt;/small&gt;],4H&lt;small&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;/small&gt;O (M = NH&lt;small&gt;&lt;sub&gt;4&lt;/sub&gt;&lt;/small&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;or K) have been refined by three-dimensional&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;X&lt;/i&gt;-ray diffraction methods. Unit cell dimensions of these monoclinic compounds, space group&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;P&lt;/i&gt;2&lt;small&gt;&lt;sub&gt;1&lt;/sub&gt;&lt;/small&gt;/&lt;i&gt;C&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;with&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Z&lt;/i&gt;= 4, are, ammonium salt:&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;a&lt;/i&gt;= 8·3934 ± 0·0008,&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;b&lt;/i&gt;= 36·1703 ± 0·0045,&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;c&lt;/i&gt;= 10·4715 ± 0·0011 Å, β= 115·958°± 0·008°; and potassium salt:&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;a&lt;/i&gt;= 8·15 ± 0·02,&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;b&lt;/i&gt;= 35·68 ± 0·1,&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;c&lt;/i&gt;= 10·30 ± 0·02 Å, β= 115·2°± 02°.&lt;/p&gt;&lt;p&gt;By use of multiple Weissenberg patterns, 8197 intensity data (Mo-&lt;i&gt;K&lt;/i&gt;&lt;small&gt;&lt;sub&gt;α&lt;/sub&gt;&lt;/small&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;radiation) for the ammonium compound and 2178 (Cu-&lt;i&gt;K&lt;/i&gt;&lt;small&gt;&lt;sub&gt;α&lt;/sub&gt;&lt;/small&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;radiation) for the potassium compound were estimated visually and used to test and refine Lindqvist's proposed structure in the space group&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;P&lt;/i&gt;2&lt;small&gt;&lt;sub&gt;1&lt;/sub&gt;&lt;/small&gt;/&lt;i&gt;c&lt;/i&gt;. Lindqvist's structure was confirmed and the full matrix least-squares isotropic refinement led to&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;R&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;0·076 (ammonium) 0·120 (potassium), with direct unambiguous location of the cations and water molecules in the potassium compound.&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1039/DT9750000505</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Royal Society of Chemistry</dc:publisher>
  <dc:title>Crystal structure of the heptamolybdate(VI)(paramolybdate) ion, [Mo7O24]6–, in the ammonium and potassium tetrahydrate salts</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>