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Journal of Coordination Chemistry Volume 69, 2016 - Issue 17
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Articles

Determination of the protonation state of [H3PW11O39]4− and the stability constant of [Ag(H2O)(H3PW11O39)]3− in aqueous solution

Jidan WangSchool of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian, PR China
,
Jiansheng LiSchool of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian, PR China
,
Wansheng YouSchool of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian, PR ChinaCorrespondence[email protected]
,
Chunxiang HeSchool of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian, PR ChinaCorrespondence[email protected]
&
Zaiming ZhuSchool of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian, PR ChinaCorrespondence[email protected]
Pages 2525-2531 | Received 26 Feb 2016, Accepted 30 Jun 2016, Published online: 09 Aug 2016
 
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Abstract

By employing elemental analysis, 31P NMR, pH, and conductivity measurements, the protonated state of lacunary heteropolyoxotungstophosphates in aqueous solution, {PW11O39}, is determined to be [H3PW11O39]4−. Using it as ligand, a complex of [Ag(H2O)(H3PW11O39)]3− is formed. An electrochemical cell is designed as follows: (−) Hg, Hg2Cl2 [Ag(H2O)(H3PW11O39)]3− (aq) | Ag(s) (+) (salt bridge is saturated KNO3 solution). By measuring the electromotive force of the cell, the stability constant of [Ag(H2O)(H3PW11O39)]3− in aqueous solution is determined to be 4.34 × 103 (25 °C).

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