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Structural identification of two differently coordinated heptamolybdate ligands in a hexamagnesium compound

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Title Statement Structural identification of two differently coordinated heptamolybdate ligands in a hexamagnesium compound
 
Added Entry - Uncontrolled Name Srinivasan, Bikshandarkoil R; GOA UNIVERSITY
UGC
 
Uncontrolled Index Term Synthetic and structural inorganic chemistry
Heptamolybdate; non-centrosymmetric; monodentate; µ2-bridging bidentate; thermal decomposition
 
Summary, etc. Dissolution of freshly prepared molybdenum trioxide in hot aqueous magnesium carbonate followed by crystallization results in the formation of a hexamganesium-bis(heptamolybdate) compound viz. [Mg(H<sub>2</sub>O)<sub>6</sub>]<sub>3</sub>[Mg(H<sub>2</sub>O)<sub>5</sub>(Mo<sub>7</sub>O<sub>24</sub>)][(H<sub>2</sub>O)<sub>5</sub>Mg(<em>µ</em><sub>2-</sub>Mo<sub>7</sub>O<sub>24</sub>)Mg(H<sub>2</sub>O)<sub>5</sub>]∙6H<sub>2</sub>O<strong> 1</strong>. Herein we report the crystal structure, spectral characteristics, thermal and electrochemical properties of <strong>1</strong>. The all-inorganic compound <strong>1</strong>, which crystallizes in the acentric polar space group <em>Cc,</em> contains six unique Mg(II) ions. The two crystallographically independent heptamolybdate anions function as a monodentate (h<sup>1</sup>) and <em>µ</em><sub>2-</sub>bridging bidentate ligand respectively forming the anionic [Mg(H<sub>2</sub>O)<sub>5</sub>(Mo<sub>7</sub>O<sub>24</sub>)]<sup>4-</sup> and [(H<sub>2</sub>O)<sub>5</sub>Mg(<em>µ</em><sub>2-</sub>Mo<sub>7</sub>O<sub>24</sub>)Mg(H<sub>2</sub>O)<sub>5</sub>]<sup>2-</sup> species, which are charge balanced by three unique hexaaquamagnesium(II) cations. The electrochemical and conductivity studies of <strong>1 </strong>reveal the presence of [Mg(H<sub>2</sub>O)<sub>6</sub>]<sup>2+</sup> cations and uncoordinated (Mo<sub>7</sub>O<sub>24</sub>)<sup>6-</sup> anions in solution. Thermal decomposition of <strong>1 </strong>leads to the formation of Mg<sub>2</sub>Mo<sub>3</sub>O<sub>11</sub> via Mg<sub>6</sub>Mo<sub>14</sub>O<sub>48</sub> and 3Mg<sub>2</sub>Mo<sub>3</sub>O<sub>11</sub>∙5MoO<sub>3</sub>.
 
Publication, Distribution, Etc. Indian Journal of Chemistry -Section A (IJCA)
2020-10-05 15:13:58
 
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http://op.niscair.res.in/index.php/IJCA/article/view/28647
 
Data Source Entry Indian Journal of Chemistry -Section A (IJCA); ##issue.vol## 59, ##issue.no## 4 (2020): INDIAN JOURNAL OF CHEMISTRY- SECTION A
 
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Nonspecific Relationship Entry http://op.niscair.res.in/index.php/IJCA/article/download/28647/465488327
http://op.niscair.res.in/index.php/IJCA/article/download/28647/465488328
http://op.niscair.res.in/index.php/IJCA/article/download/28647/465488329
http://op.niscair.res.in/index.php/IJCA/article/download/28647/465496871
http://op.niscair.res.in/index.php/IJCA/article/download/28647/465496872
http://op.niscair.res.in/index.php/IJCA/article/download/28647/465496873
 
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